CN109852845B - Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof - Google Patents
Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof Download PDFInfo
- Publication number
- CN109852845B CN109852845B CN201910301923.3A CN201910301923A CN109852845B CN 109852845 B CN109852845 B CN 109852845B CN 201910301923 A CN201910301923 A CN 201910301923A CN 109852845 B CN109852845 B CN 109852845B
- Authority
- CN
- China
- Prior art keywords
- titanium alloy
- toughness
- strength
- type high
- beta type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a near-beta type high-strength and high-toughness titanium alloy which comprises the following components in percentage by mass: 4.0 to 5.5 percent of Al, 0.8 to 1.8 percent of Zr, 3.0 to 4.5 percent of Mo, 1.0 to 2.0 percent of V, 1.5 to 2.5 percent of Fe, 2.5 to 3.5 percent of Cr, less than or equal to 0.12 percent of B, and the balance of Ti and inevitable impurities; the invention also discloses a preparation method of the near-beta type high-strength and high-toughness titanium alloy, which adopts a large amount of TA15 reclaimed materials as raw materials. According to the invention, Al-Zr system and Mo-V-Cr-Fe system are adopted to jointly strengthen alpha phase and beta phase in the titanium alloy, so that the coupling strengthening effect is enhanced, the titanium alloy has good toughness matching, the aluminum equivalent and the molybdenum equivalent are controlled, and the titanium alloy has good strength and toughness; the invention adopts TA15 titanium alloy reclaimed materials as raw materials, thereby greatly reducing the preparation cost.
Description
Technical Field
The invention belongs to the technical field of titanium alloy, and particularly relates to a near-beta type high-strength and high-toughness titanium alloy and a preparation method thereof.
Background
Titanium has many characteristics: the high-strength stainless steel has the advantages of low density, high specific strength, corrosion resistance, wide temperature-resistant zone and good welding performance, is an ideal structural material, and plays an extremely important role in the development of national defense high technology, weaponry and civil industries. Titanium alloys are used in a large amount in the military and commercial fields of aviation, aerospace, ships, weaponry, chemical engineering and the like, and have a tendency of gradual increase. However, the price of titanium alloy is high, generally 8-10 times of that of steel, and the titanium alloy seriously influences the field with strict cost control requirements on weapons, ships, chemical engineering and the like. Worse, in recent years, the price of the most important master alloy aluminum vanadium of titanium alloy rises dramatically (Al55V rises from about 240 yuan/kg in 2017 to 600 yuan/kg at present, and the demand of vanadium in the steel industry in China is strong, and the price of the aluminum vanadium master alloy will keep high in the long future), so that the production cost of the TC4 titanium alloy (Ti-6Al-4V) which is widely applied at present rises by more than 15 yuan per kilogram.
Because the starting is late, the weapon industry in China currently lacks special titanium alloy with low cost, high specific strength and high damage tolerance, namely low-cost and high-toughness titanium alloy, so that the production cost is difficult to control in a lower range on the premise of ensuring the use safety and high-efficiency weight reduction. In addition, due to the application characteristics of the weapon industry, part of the titanium products need to rub against the ground or structural parts made of other materials for a long time, so that higher requirements are put on the wear resistance of the titanium alloy for soldiers.
The development work of low-cost high-strength titanium alloy at home and abroad is always carried out. Ti12LC (Ti-4.5Al-7Mo-2Fe) alloy developed by northwest nonferrous metals research institute and LCB (Ti-4.5Fe-6.8Mo-1.5Al) developed by the United states all adopt cheap Fe or Fe-Mo intermediate alloy as production raw materials, so that the material cost can be obviously reduced, but the alloy still has good mechanical property and hot-working plasticity. The tensile strength of the two alloys can reach about 1100MPa, the toughness is equivalent to TC11, the two alloys belong to conventional high-strength low-cost titanium alloys, but the specific strength of the two alloys is still a certain difference compared with the titanium alloys with higher strength, particularly the ultrahigh-strength titanium alloys with the strength exceeding 1400 MPa. In addition, the wear resistance of the two titanium alloys and the conventional titanium alloy is greatly different from that of high-strength steel, and the design requirements of structural members such as a crawler belt and the like which have both strength requirements and wear resistance requirements cannot be met at present.
A small amount of B element is added into the alloy, so that the solidification characteristic of the alloy can be improved, the grain size of cast ingots is refined, and the in-situ authigenic strengthening phase TiB can be formed by desolventizing after solidification. The in-situ authigenic hard particles which are distributed in a dispersing way are firmly combined with the matrix, so that the wear resistance and tensile strength of the alloy can be effectively improved, excessive hard precipitates can damage the room-temperature plasticity and toughness of the alloy, and the dispersion degree and the total content of the precipitates need to be controlled, so that higher comprehensive performance matching is achieved, and the use requirements of the field of the weapon industry part on titanium alloy with high toughness and high wear resistance are met.
At present, the titanium residue recovery technology in China has obvious progress, and titanium products meeting the national standard requirements can be prepared in large batch by using the titanium residue. China produces a large amount of TA15 titanium alloy residues every year in the titanium industry, but TA15 titanium alloy reclaimed material products are few in application at present. A large amount of residual waste materials generated in each production link of the TA15 titanium alloy for aviation and aerospace can only be treated as common waste materials, so that great resource waste is caused. If a novel titanium alloy for soldiers can be developed, a large amount of TA15 titanium alloy residues can be used, the application requirements of low cost and high toughness for the soldiers are met, the problem of recycling a large amount of TA15 titanium alloy residues can be solved, the large-range application of the titanium alloy in the field of weapons can be promoted, and the upgrading and updating process of weapon equipment in China is accelerated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a near-beta type high-strength and high-toughness titanium alloy aiming at the defects of the prior art. The near-beta type high-strength and high-toughness titanium alloy adopts an Al-Zr system to jointly strengthen an alpha phase in the titanium alloy, adopts a Mo-V-Cr-Fe system to jointly strengthen a beta phase in the titanium alloy, enhances the coupling strengthening effect, ensures the stability of the phase and the performance of the titanium alloy, enables the titanium alloy to have good strength and toughness matching, simultaneously controls the Aleq to be 4.2-5.5 and the Moeq to be 12.5-15.0, enables the titanium alloy to have good strength and toughness, avoids the risk of eutectoid reaction of Cr and Fe alloy elements, and ensures the strengthening effect.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 4.0 to 5.5 percent of Al, 0.8 to 1.8 percent of Zr, 3.0 to 4.5 percent of Mo, 1.0 to 2.0 percent of V, 1.5 to 2.5 percent of Fe, 2.5 to 3.5 percent of Cr, less than or equal to 0.12 percent of B, and the balance of Ti and inevitable impurities; the tensile strength of the titanium alloy after heat treatment is 1100 MPa-1350 MPa, the yield strength is more than 1020MPa, the elongation percentage A after fracture is more than 8%, the reduction of area Z is more than 16%, and the impact toughness a isKUGreater than 25J/cm2Fracture toughness KICGreater than 60MPa m1/2。
The Moeq (Mo equivalent) of the near-beta titanium alloy is specified in a range of 11.0-16.5, and for the near-beta titanium alloy with high Moeq, the high Aleq (Al equivalent) can increase the strength of the titanium alloy to a certain extent, but can seriously damage the toughness of the titanium alloy, thereby seriously affecting the popularization and application of the high-strength titanium alloy in the field of structural members; the low Aleq alloy has good toughness, but has low strength, and cannot meet the design requirement of high toughness. The Aleq of the near-beta high-toughness titanium alloy is controlled to be 4.2-5.5, so that the near-beta high-toughness titanium alloy has good strength and toughness, and meanwhile, the alpha phase in the titanium alloy is strengthened by adopting an Al-Zr system together, so that the near-beta high-toughness titanium alloy has a more efficient coupling strengthening effect compared with the titanium alloy which is singly adopted by an Al element; in addition, under the premise of ensuring that Aleq is not changed, Zr replaces partial Al, so that precipitation of Ti3Al intermetallic compounds in a long-time aging process can be inhibited, the plasticity and toughness of the titanium alloy are damaged, and excessive growth of crystal grains when the crystal grains are heated above the phase transition temperature can be inhibited, so that the hot-working crystal grain refining efficiency of the titanium alloy is improved, and the production period and the cost are reduced.
The near-beta type high-strength and high-toughness titanium alloy adopts a Mo-V-Cr-Fe system to jointly strengthen the beta phase. Cr and Fe are slow eutectoid beta-stable elements with high efficiency and low cost, and are added together with Mo element, so that the eutectoid reaction of the slow eutectoid Cr and Fe alloy elements in long-time aging and use can be effectively inhibited while the high-efficiency strengthening effect of the beta phase of the Mo element is kept, the stability of the phase and performance of the titanium alloy in the use process is ensured, and the production cost is obviously reduced. The element V has high cost and weak strengthening effect, but because the element can be infinitely dissolved in a beta phase, the element also has certain solid solubility in an alpha phase, and eutectoid reaction and compound precipitation are avoided, and based on the characteristics, the addition of the element V can effectively improve the toughness of the high-strength titanium alloy after aging strengthening. Therefore, by adding a proper amount of V element, the beta-phase can be reinforced more efficiently by coupling and reinforcing with Mo, Cr and Fe alloy on the premise of not increasing the cost obviously, and the alloy has good toughness matching.
For Ti-Al-Zr-Mo-V-Cr-Fe titanium alloy, high Moeq means good solid solution strengthening effect, but too high Moeq can reduce the alpha phase content at room temperature, thereby reducing the alpha/beta phase interface and damaging the interface strengthening effect, and high Moeq can also increase the potential risk of eutectoid reaction of Cr and Fe alloy elements; a low Moeq does not ensure sufficient solid solution and aging strengthening effect. Therefore, Moeq of the near-beta high-strength and toughness titanium alloy is controlled to be 12.5-15.0, the risk of eutectoid reaction of Cr and Fe alloy elements is avoided, and the strengthening effect is guaranteed.
Moeq and Al in the near-beta type high-strength and high-toughness titanium alloyeqThe calculation formula of (2) is as follows:
Moeq＝1.0Mo+0.2Ta+0.4W+0.67V+1.25Cr+1.25Ni+1.7Mn+1.7Co+2.5Fe+0.28Nb
Aleq＝1.0Al+1/3Sn+1/6Zr+10O+10C+20N
the near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 4.2 to 5.3 percent of Al, 1.0 to 1.8 percent of Zr, 3.2 to 4.5 percent of Mo, 1.0 to 1.9 percent of V, 1.5 to 2.5 percent of Fe, 2.5 to 3.5 percent of Cr, less than or equal to 0.12 percent of B, and the balance of Ti and inevitable impurities.
The near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 5.0% of Al, 1.0% of Zr, 3.5% of Mo, 1.4% of V, 2% of Fe, 3% of Cr, and the balance of Ti and inevitable impurities.
The near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 4.5% of Al, 1.8% of Zr, 4.5% of Mo, 1.2% of V, 1.5% of Fe, 3% of Cr, 0.05% of B, and the balance of Ti and inevitable impurities.
The near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 4.2% of Al, 1.4% of Zr, 4.1% of Mo, 1.9% of V, 2% of Fe, 3.5% of Cr, 0.12% of B, and the balance of Ti and inevitable impurities.
The near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 5.3% of Al, 1.0% of Zr, 3.2% of Mo, 1.0% of V, 2.5% of Fe, 2.5% of Cr, and the balance of Ti and inevitable impurities.
In addition, the invention also provides a preparation method of the near-beta type high-strength and toughness titanium alloy, which is characterized in that the method performs assembly welding on an electrode prepared from the TA15 titanium alloy reclaimed material and an electrode pressed by mixing aluminum beans, iron nails, metallic chromium, titanium sponge, iron-molybdenum intermediate alloy and boron powder to prepare a smelting electrode, then the smelting electrode is smelted in a vacuum consumable arc furnace to obtain a titanium alloy ingot, and the titanium alloy ingot is processed into a molding material, wherein the mass percent of the electrode prepared from the TA15 titanium alloy reclaimed material in the smelting electrode is 50-70%.
According to the preparation method of the near-beta type high-strength and high-toughness titanium alloy, a large amount of TA15 reclaimed materials are adopted as raw materials, so that the preparation cost is greatly reduced, a special preparation method is not needed, the problem of recycling a large amount of TA15 titanium alloy residual materials is solved, and the preparation method has a wide application prospect; in addition, the iron-molybdenum intermediate alloy, the aluminum beans and the iron nails in the raw materials are all low in price, so that the preparation cost is further reduced.
Compared with the prior art, the invention has the following advantages:
1. the near-beta type high-strength and toughness titanium alloy has excellent strength and toughness, the tensile strength of the titanium alloy after heat treatment is 1100-1350 MPa, the yield strength is more than 1020MPa, the elongation percentage A after fracture is more than 8%, the reduction of area Z is more than 16%, and the impact toughness a isKUGreater than 25J/cm2Fracture toughness KICGreater than 60MPa m1/2。
2. The near-beta type high-strength and toughness titanium alloy disclosed by the invention is added with a proper amount of B element in a Ti-Al-V-Mo-Zr-Cr-Fe main alloy system, and a TiB hard precipitated phase is generated in situ, so that the wear resistance of the titanium alloy can be effectively improved under the condition of ensuring certain matching of strong plasticity and toughness of the titanium alloy.
3. The preparation method of the near-beta type high-strength and toughness titanium alloy adopts a large amount of TA15 titanium alloy reclaimed materials as preparation raw materials, reduces the raw material cost of the titanium alloy, has the raw material cost not more than 65% of that of the TC4 titanium alloy, but has the strong plasticity and strength and toughness matching far higher than that of the TC4 titanium alloy, has the raw material cost only half of that of the TC18 titanium alloy, and has the comprehensive mechanical property matching equivalent to that of the TC18 titanium alloy.
4. The near-beta type high-strength and toughness titanium alloy of the invention uses a great amount of TA15 titanium alloy reclaimed materials as preparation raw materials, not only solves the problem of utilization of TA15 titanium alloy reclaimed materials, but also meets the application requirements of low cost, high strength and toughness of titanium alloy materials for weapon industry.
5. The near-beta type high-strength and toughness titanium alloy can be processed into products such as bars, plates, wires, forgings and the like, is particularly suitable for the field of weapon industry, can accelerate the upgrading and upgrading process of weapon equipment systems in China, and has wide application prospect.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a metallographic structure diagram of a near- β type low-cost high-toughness titanium alloy bar in example 1 of the present invention.
Detailed Description
The raw material cost accounting in examples 1 to 4 of the present invention and comparative examples 1 to 3 is as shown in table 1 below.
TABLE 1 raw material price for smelting titanium alloy
Note: TA15 residual waste is sold at a price of about 15 yuan/kg, and the residual waste is recovered to be made into an electrode and then the price is greatly exceeded.
Example 1
The near-beta type high-toughness titanium alloy of the embodiment comprises the following components in percentage by mass: 5.0% of Al, 1.0% of ZrC, 3.5% of Mo, 1.4% of V, 2% of Fe, 3% of Cr, and the balance of Ti and inevitable impurities.
The preparation method of the near-beta type high-strength and high-toughness titanium alloy comprises the following steps: fully mixing an electrode prepared from a TA15 titanium alloy reclaimed material with an electrode pressed from aluminum beans, iron nails, chromium metal, 0-grade sponge titanium and iron-molybdenum intermediate alloy, and then carrying out assembly welding to prepare a smelting electrode, wherein the mass percentage of the electrode prepared from the TA15 titanium alloy reclaimed material in the smelting electrode is 60%, and then carrying out three times of vacuum consumable arc smelting to obtain a titanium alloy cast ingot; after the titanium alloy ingot is mechanically processed and subsequently thermally processed, a titanium alloy bar with the diameter of 90mm is prepared, and after the titanium alloy bar is sequentially subjected to 850 ℃/1h, FC +720 ℃/1h, AC +560 ℃/6h, AC solid solution + aging heat treatment, the room-temperature mechanical property is as follows: the tensile strength is 1186MPa, the yield strength is 1157MPa, the elongation after fracture is 16.0 percent, the reduction of area is 41 percent, and the impact toughness is 35.0J/cm2And the C-R direction fracture toughness is 65 MPa.m1/2。
The cost of the raw materials for the melting electrode of this example was calculated to be 64 yuan/kg.
Fig. 1 is a metallographic structure diagram of a near- β type low-cost high-toughness titanium alloy bar in this embodiment, and it can be seen from fig. 1 that the metallographic structure of the near- β type low-cost high-toughness titanium alloy bar in this embodiment is a typical equiaxial structure, so that the alloy has excellent room-temperature plasticity after solution + aging heat treatment.
Example 2
The near-beta type high-toughness titanium alloy of the embodiment comprises the following components in percentage by mass: 4.5% of Al, 1.8% of ZrC, 4.5% of Mo, 1.2% of V, 1.5% of Fe, 3% of Cr, 0.05% of B, and the balance of Ti and inevitable impurities.
The preparation method of the near-beta type high-strength and high-toughness titanium alloy comprises the following steps: fully mixing an electrode prepared from a TA15 titanium alloy reclaimed material with an electrode pressed from aluminum beans, iron nails, metal chromium, boron powder, grade 1 sponge titanium and iron-molybdenum intermediate alloy, and then carrying out assembly welding to prepare a smelting electrode, wherein the mass percentage of the electrode prepared from the TA15 titanium alloy reclaimed material in the smelting electrode is 70%, and then carrying out three times of vacuum consumable arc smelting to obtain a titanium alloy cast ingot; after the titanium alloy ingot is mechanically processed and subsequently thermally processed, a near-beta type titanium alloy bar with the diameter of 200mm is prepared, and after the near-beta type titanium alloy bar is sequentially subjected to 850 ℃/1h, FC +720 ℃/1h, AC +560 ℃/6h, AC solid solution + aging heat treatment, the room-temperature mechanical property is as follows: the tensile strength is 1167MPa, the yield strength is 1129MPa, the elongation after fracture is 13.0 percent, the reduction of area is 38.0 percent, and the impact toughness is 31.0J/cm2And the fracture toughness in the C-R direction is 62 MPa.m1/2。
The cost of the raw materials of the melting electrode in the embodiment is calculated to be 85 yuan/kg.
The near-beta titanium alloy bar prepared in this example is subjected to a steel ball friction test, and the test result shows that the loss per unit time of the near-beta titanium alloy bar prepared in this example is 45% of that of the TC4 titanium alloy and 70% of that of the TC18 titanium alloy, which indicates that the near-beta titanium alloy bar prepared in this example has excellent wear resistance.
Example 3
The near-beta type high-toughness titanium alloy of the embodiment comprises the following components in percentage by mass: 4.2% of Al, 1.4% of ZrC, 4.1% of Mo, 1.9% of V, 2% of Fe, 3.5% of Cr, 0.12% of B, and the balance of Ti and inevitable impurities.
The preparation method of the near-beta type high-strength and high-toughness titanium alloy comprises the following steps: fully mixing an electrode prepared from a TA15 titanium alloy reclaimed material with an electrode pressed from aluminum beans, iron nails, chromium metal, grade 1 sponge titanium and FeMo60B intermediate alloy, and then carrying out assembly welding to prepare a smelting electrode, wherein the mass percentage of the electrode prepared from the TA15 titanium alloy reclaimed material in the smelting electrode is 70%, and then carrying out three times of vacuum consumable arc smelting to obtain a titanium alloy cast ingot; after the titanium alloy ingot is mechanically processed and subsequently thermally processed, a near-beta type titanium alloy bar with the diameter of 30mm is prepared, and after the near-beta type titanium alloy bar is sequentially subjected to 800 ℃/1h, AC +560 ℃/6h, AC solid solution and aging heat treatment, the room-temperature mechanical property is as follows: tensile strength of 1330MPa, yield strength of 1280MPa, elongation after fracture of 8.0%, reduction of area of 17.2%, and impact toughness of 25.6J/cm2(ii) a After 830 ℃/1h, FC-740 ℃/1h, AC +540 ℃/6h and AC solid solution + aging heat treatment of the near-beta type titanium alloy bar, the room temperature mechanical properties are as follows: the tensile strength is 1238MPa, the yield strength is 1186MPa, the elongation after fracture is 11 percent, the reduction of area is 21.2 percent, and the impact toughness is 27.4J/cm2。
The cost of the raw materials for the melting electrode of this example was calculated to be 64 yuan/kg.
The near-beta titanium alloy bar prepared in this example is subjected to a steel ball friction test, and the test result shows that the loss per unit time of the near-beta titanium alloy bar prepared in this example is 32% of that of the TC4 titanium alloy and 65% of that of the TC18 titanium alloy, which indicates that the near-beta titanium alloy bar prepared in this example has excellent wear resistance.
Example 4
The near-beta type high-toughness titanium alloy of the embodiment comprises the following components in percentage by mass: 5.3% of Al, 1.0% of ZrC, 3.2% of Mo, 1.0% of V, 2.5% of Fe, 2.5% of Cr, and the balance of Ti and inevitable impurities.
The preparation method of the near-beta type high-strength and high-toughness titanium alloy comprises the following steps: mixing the electrode prepared from TA15 titanium alloy reclaimed material with intermediate alloy of aluminum bean, iron nail, chromium metal, grade 1 sponge titanium and iron molybdenumAssembling and welding the pressed electrode to prepare a smelting electrode, wherein the mass percentage of the electrode prepared from TA15 titanium alloy reclaimed materials in the smelting electrode is 50%, and then carrying out three times of vacuum consumable arc smelting to obtain a titanium alloy ingot; after the titanium alloy ingot is mechanically processed and subsequently thermally processed, a near-beta type titanium alloy bar with the diameter of 200mm is prepared, and after the near-beta type titanium alloy bar is sequentially subjected to 850 ℃/1h, FC +720 ℃/1h, AC +580 ℃/6h, AC solid solution + aging heat treatment, the room-temperature mechanical property is as follows: the tensile strength is 1120MPa, the yield strength is 1042MPa, the elongation after fracture is 16.0 percent, the reduction of area is 39.2 percent, and the impact toughness is 42.6J/cm2And the C-R direction fracture toughness is 89.2 MPa.m1/2。
The cost of the raw materials of the melting electrode in the embodiment is 68 yuan/kg through calculation.
Comparative example 1
The titanium alloy of the comparative example is TC18 titanium alloy, the component is Ti-5Al-5V-5Mo-1Cr-1Fe, and the titanium alloy comprises the following components in percentage by mass: 5% of Al, 5% of Mo, 5% of V, 1% of Fe, 1% of Cr, and the balance of Ti and inevitable impurities.
The preparation method of the TC18 titanium alloy of the comparative example comprises the following steps: preparing Al-60Mo alloy, Al-85V alloy, Ti-30Fe alloy, chromium metal, aluminum beans and 0-grade sponge titanium according to design components, pressing electrodes, and smelting in a three-time vacuum consumable arc furnace to obtain TC18 titanium alloy ingots; after mechanical processing and subsequent hot working of a TC18 titanium alloy ingot, preparing a TC18 titanium alloy bar with the diameter of 200mm, wherein the room-temperature mechanical properties of the TC18 titanium alloy bar are as follows after 840 ℃/1h, FC +740 ℃/1h, AC +560 ℃/6h, AC solid solution and aging heat treatment in sequence: the tensile strength is 1138MPa, the yield strength is 1053MPa, the elongation after fracture is 12 percent, the reduction of area is 34 percent, and the impact toughness is 34.6J/cm2And the C-R direction fracture toughness is 72.1 MPa.m1/2。
The cost of the raw material of the electrode of this comparative example was calculated to be 140 yuan/kg.
Comparing comparative example 1 with example 1, it can be seen that the toughness of the TC18 titanium alloy in comparative example 1 is substantially the same as that of the near- β type high-toughness titanium alloy in example 1, but the strength and plasticity of the near- β type high-toughness titanium alloy in example 1 is better than that of the TC18 titanium alloy in comparative example 1; comparing the comparative example 1 with the example 4, it can be seen that the TC18 titanium alloy in the comparative example 1 and the near β -type high toughness titanium alloy in the example 4 have substantially the same strength and plasticity, but the fracture toughness of the near β -type high toughness titanium alloy in the example 4 is better than that of the TC18 titanium alloy in the comparative example 1, which shows that the near β -type high toughness titanium alloy of the present invention adopts Al and Zr alloy elements to efficiently combine and strengthen the α phase, and is better than that of the TC18 titanium alloy, so that the near β -type high toughness titanium alloy has a better coupling strengthening effect with the β phase strengthened by high Moeq (Mo, V, Fe, Cr alloy elements are efficiently strengthened, and Moeq > 12.1), and thus has a better toughness matching. Although the addition of two slow-commonality beta-stable elements of Fe and Cr has potential influence on the phase stability and the corresponding performance stability of the titanium alloy, the addition of Mo can obviously inhibit the common reaction process of the slow-commonality beta-stable elements, and the slight risk reduction of the phase stability and the performance stability of the titanium alloy is completely acceptable for the weapon industry. In addition, the raw material cost of the near-beta type high-strength and toughness titanium alloy of the embodiments 1 and 4 is 1/2 of the TC18 titanium alloy of the comparative example 1, which shows that the invention adopts the TA15 titanium alloy reclaimed material as the preparation raw material, thereby greatly reducing the preparation cost of the near-beta type high-strength and toughness titanium alloy.
Comparing comparative example 1 with examples 2 and 3, it can be seen that the TC18 titanium alloy of comparative example 1 has slightly better plasticity and toughness than the near β type high toughness titanium alloy of examples 2 and 3, but its strength, especially wear resistance, is much lower than the near β type high toughness titanium alloy of examples 2 and 3, which shows that B added to the near β type high toughness titanium alloy of the present invention produces TiB hard strengthening phase in situ in the β matrix, and although the toughness and room temperature plasticity of the titanium alloy are impaired, the wear resistance and strength of the titanium alloy are greatly improved. In addition, even if high-cost B element is added, the raw material cost of the embodiment 2 and the embodiment 3 does not exceed 60 percent of that of TC18, which shows that the TA15 titanium alloy reclaimed material is adopted as the preparation raw material in the invention, so that the preparation method has strong competitive advantage.
Comparative example 2
The titanium alloy of the comparative example is Ti12LC titanium alloy, the component is Ti-4.5Al-7Mo-2Fe, and the titanium alloy comprises the following components by mass percent: 4.5% of Al, 7.0% of Mo, 2% of Fe, and the balance of Ti and inevitable impurities.
The preparation method of the TC18 titanium alloy of the comparative example comprises the following steps: preparing Fe-Mo60B alloy, grade 1 sponge titanium and aluminum beans according to design components, pressing electrodes, and smelting in a vacuum consumable arc furnace for three times to obtain a TC18 titanium alloy ingot; after mechanical processing and subsequent hot working of a TC18 titanium alloy ingot, a TC18 titanium alloy bar with the diameter of 200mm is prepared, and after 780 ℃/2h, AC +550 ℃/6h, AC solid solution and aging heat treatment are carried out on the TC18 titanium alloy bar in sequence, the room-temperature mechanical properties are as follows: the tensile strength is 1065MPa, the yield strength is 1010MPa, the elongation after fracture is 12 percent, the reduction of area is 28 percent, and the impact toughness is 35.4J/cm2。
The cost of the raw material of the electrode of this comparative example was calculated to be 68 yuan/kg.
Comparing the comparative example 2 with the examples 1 and 4, it can be seen that the strength of the near- β type high toughness titanium alloy of the examples 1 and 4 is significantly higher than that of the TC18 titanium alloy of the comparative example 2, and can be controlled in a wider range, which indicates that the near- β type high toughness titanium alloy of the present invention adopts Al and Zr alloy elements to jointly strengthen the α phase, adopts Mo, V, Fe, and Cr to jointly strengthen the β phase, and controls Aleq of the titanium alloy to be higher than Ti12LC, so that the α phase and the β phase have better strengthening matching, and the strength level of the titanium alloy can be controlled in a wider range by controlling the content and morphology of the precipitated α phase. Although the toughness level and the raw material cost of the near-beta type high-toughness titanium alloy are not obvious compared with those of TC18 titanium alloy, the problem of recycling TA15 residual waste is solved, and the wear resistance of the near-beta type high-toughness titanium alloy is greatly improved by regulating the content of B element.
Comparative example 3
The titanium alloy of the comparative example is TC4 titanium alloy, the component is Ti-6.5Al-4.2V, and the titanium alloy comprises the following components in percentage by mass: 6.5% of Al, 4.2% of V, and the balance of Ti and inevitable impurities.
The preparation method of the TC4 titanium alloy of the comparative example comprises the following steps: adopting AlV55, 0-grade sponge titanium and aluminum beans, mixing according to design components, pressing electrodes, and performing vacuum treatment for three timesSmelting in a consumable arc furnace to obtain a TC4 titanium alloy ingot; after mechanical processing and subsequent hot working of a TC4 titanium alloy ingot, a TC4 titanium alloy bar with the diameter of 200mm is prepared, and after 780 ℃/2h and AC annealing treatment are carried out on the TC4 titanium alloy bar in sequence, the room-temperature mechanical properties are as follows: tensile strength of 940MPa, yield strength of 863MPa, elongation after fracture of 13%, reduction of area of 21%, and impact toughness of 28.6J/cm2And a C-R direction fracture toughness of 64.3MPa · m1/2。
The cost of the raw material of the electrode of this comparative example was calculated to be 105 yuan/kg.
Comparing the comparative example 3 with the examples 1 to 4, it can be known that the plasticity and toughness of the TC4 titanium alloy of the comparative example 3 are substantially equivalent to the levels of the near- β type high-toughness titanium alloy of the examples 1 to 4, but the strength of the TC4 titanium alloy of the comparative example 3 is far lower than that of the near- β type high-toughness titanium alloy of the examples 1 to 4, and the raw material cost of the TC4 titanium alloy is more than 1.5 times of that of the near- β type high-toughness titanium alloy, which indicates that the near- β type high-toughness titanium alloy of the present invention has good comprehensive mechanical property matching and cost performance, and therefore, the near- β type high-toughness titanium alloy has better popularization and application potentials.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (7)
1. The near-beta type high-strength and high-toughness titanium alloy is characterized by comprising the following components in percentage by mass: 4.0-5.5% of Al, 0.8-1.8% of Zr, 3.0-4.5% of Mo, 1.0-2.0% of V, 1.5-2.5% of Fe, 2.5-3.5% of Cr, less than or equal to 0.12% of B, and the balance of Ti and inevitable impurities; the titanium alloy has an aluminum equivalent Aleq of 4.2-5.5 and a molybdenum equivalent Moeq of 12.5-15.0; the titanium alloy after heat treatment has tensile strength of 1100-1350 MPa, yield strength of more than 1020MPa, elongation percentage A of more than 8% after fracture, reduction of area Z of more than 16%, and impact toughness aKUGreater than 25J/cm2Fracture toughness KICGreater than 60MPa m1/2。
2. The near-beta type high-toughness titanium alloy according to claim 1, which is characterized by comprising the following components in percentage by mass: 4.2-5.3% of Al, 1.0-1.8% of Zr, 3.2-4.5% of Mo, 1.0-1.9% of V, 1.5-2.5% of Fe, 2.5-3.5% of Cr2, less than or equal to 0.12% of B, and the balance of Ti and inevitable impurities.
3. The near-beta type high-toughness titanium alloy according to claim 2, which is characterized by comprising the following components in percentage by mass: 5.0% of Al, 1.0% of Zr, 3.5% of Mo, 1.4% of V, 2% of Fe, 3% of Cr, and the balance of Ti and inevitable impurities.
4. The near-beta type high-toughness titanium alloy according to claim 2, which is characterized by comprising the following components in percentage by mass: 4.5% of Al, 1.8% of Zr, 4.5% of Mo, 1.2% of V, 1.5% of Fe, 3% of Cr, 0.05% of B, and the balance of Ti and inevitable impurities.
5. The near-beta type high-toughness titanium alloy according to claim 2, which is characterized by comprising the following components in percentage by mass: 4.2% of Al, 1.4% of Zr, 4.1% of Mo, 1.9% of V, 2% of Fe, 3.5% of Cr, 0.12% of B, and the balance of Ti and inevitable impurities.
6. The near-beta type high-toughness titanium alloy according to claim 2, which is characterized by comprising the following components in percentage by mass: 5.3% of Al, 1.0% of Zr, 3.2% of Mo, 1.0% of V, 2.5% of Fe, 2.5% of Cr, and the balance of Ti and inevitable impurities.
7. The method for preparing the near-beta type high strength and toughness titanium alloy as claimed in any one of claims 1 to 6 is characterized in that an electrode prepared from TA15 titanium alloy reclaimed materials is assembled and welded with an electrode pressed by aluminum beans, iron nails, metallic chromium, sponge titanium, iron-molybdenum intermediate alloy and boron powder to prepare a smelting electrode, then the smelting electrode is smelted in a vacuum consumable electrode electric arc furnace to obtain a titanium alloy ingot, and the titanium alloy ingot is processed into a molding material, wherein the mass percent of the electrode prepared from TA15 titanium alloy reclaimed materials in the smelting electrode is 50-70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910301923.3A CN109852845B (en) | 2019-04-16 | 2019-04-16 | Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910301923.3A CN109852845B (en) | 2019-04-16 | 2019-04-16 | Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109852845A CN109852845A (en) | 2019-06-07 |
| CN109852845B true CN109852845B (en) | 2020-11-03 |
Family
ID=66889211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910301923.3A Active CN109852845B (en) | 2019-04-16 | 2019-04-16 | Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109852845B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257668B (en) * | 2019-07-31 | 2021-03-26 | 西北有色金属研究院 | High-performance and low-cost titanium alloy |
| CN111519067B (en) * | 2020-05-26 | 2021-11-09 | 西北有色金属研究院 | High-performance, low-cost and high-strength titanium alloy |
| CN112872654B (en) * | 2021-02-23 | 2022-01-28 | 哈尔滨焊接研究院有限公司 | TC4 titanium alloy solid welding wire for large-thickness ultra-narrow gap laser filler wire welding and preparation method thereof |
| CN113355559B (en) * | 2021-08-10 | 2021-10-29 | 北京煜鼎增材制造研究院有限公司 | High-strength high-toughness high-damage-tolerance titanium alloy and preparation method thereof |
| CN114959362B (en) * | 2022-06-20 | 2023-03-14 | 长安大学 | High-strength high-plasticity laser additive manufacturing titanium alloy based on equiaxial fine grain strengthening |
| CN115404382B (en) * | 2022-09-22 | 2023-06-06 | 东南大学 | High-strength high-plasticity titanium alloy and preparation method thereof |
| CN115821113B (en) * | 2022-12-26 | 2024-04-30 | 西部金属材料股份有限公司 | High-weldability titanium alloy and preparation method thereof |
| CN115927911B (en) * | 2022-12-26 | 2024-04-02 | 西部金属材料股份有限公司 | High-hardness titanium alloy and preparation method and application thereof |
| CN116397132A (en) * | 2023-04-14 | 2023-07-07 | 西北有色金属研究院 | High-performance low-cost two-phase titanium alloy |
| CN117403157B (en) * | 2023-10-12 | 2024-05-28 | 西北工业大学 | Preparation method of high-impact-resistance M36 titanium alloy bar |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2614040B1 (en) * | 1987-04-16 | 1989-06-30 | Cezus Co Europ Zirconium | PROCESS FOR THE MANUFACTURE OF A PART IN A TITANIUM ALLOY AND A PART OBTAINED |
| CN106507838B (en) * | 2005-05-18 | 2011-01-12 | 西北有色金属研究院 | A kind of 1300MPa levels superelevation strong structure titanium alloy |
| CN103131896B (en) * | 2011-12-01 | 2015-03-11 | 北京有色金属研究总院 | Low-cost beta-close titanium alloy |
-
2019
- 2019-04-16 CN CN201910301923.3A patent/CN109852845B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109852845A (en) | 2019-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109852845B (en) | Near-beta type high-strength and high-toughness titanium alloy and preparation method thereof | |
| CN109930030B (en) | Alpha-beta type high-strength and high-impact-toughness titanium alloy and preparation method thereof | |
| CN101760667A (en) | Novel high strength and toughness titanium alloy | |
| CN101451206B (en) | Superhigh intensity titanium alloy | |
| CN109234554B (en) | Preparation method of high-temperature titanium alloy bar | |
| CN104169449A (en) | Titanium alloy with improved properties | |
| CN111020414B (en) | Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C | |
| CN101775524A (en) | Titanium alloy material and preparation method thereof | |
| CN103114224B (en) | Multi-component alloy composite reinforced high-strength titanium alloy and preparation method thereof | |
| CN104630597A (en) | Iron-nickel-chromium-based superalloy and manufacturing method thereof | |
| CN104745879A (en) | High-density ultra-high-strength Co-reinforced nickel-based high-tungsten heat-resistant alloy and preparation method | |
| CN110747372A (en) | Low-cost high-strength titanium alloy plate prepared from 100% returned furnace burden and preparation method thereof | |
| CN105088014A (en) | Low-cost and high-strength Ti-Fe alloy billet and preparing technology thereof | |
| CN112746176B (en) | Method for controlling trace element distribution in ESR cast ingot and application thereof | |
| CN111519067B (en) | High-performance, low-cost and high-strength titanium alloy | |
| CN110184499B (en) | Micro-alloying method for improving strength level of TC4 titanium alloy | |
| CN114807678B (en) | High-strength high-toughness weldable high-temperature titanium alloy and preparation method thereof | |
| CN110923589A (en) | Short fiber reinforced high-temperature titanium alloy Ti-101AM for 700-750 DEG C | |
| CN109971999A (en) | A kind of 1500MPa grades of superelevation be strong, in tough titanium alloy | |
| CN110172624A (en) | A kind of high tough aluminum alloy forge piece and preparation method thereof | |
| CN110484774B (en) | 650 ℃ high-temperature resistant titanium alloy | |
| CN111850349B (en) | Hot processing method of cobalt-based high-temperature alloy | |
| CN108277385A (en) | A kind of titanium alloy plate and processing method | |
| CN115194069A (en) | Preparation method of Ti175 alloy large-size blisk forging | |
| CN113981272B (en) | Ti-6Al-4V-xFe-yMo titanium alloy and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |