CN117802433A - TiAl-based alloy square billet bar and preparation method and application thereof - Google Patents
TiAl-based alloy square billet bar and preparation method and application thereof Download PDFInfo
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- CN117802433A CN117802433A CN202311865450.2A CN202311865450A CN117802433A CN 117802433 A CN117802433 A CN 117802433A CN 202311865450 A CN202311865450 A CN 202311865450A CN 117802433 A CN117802433 A CN 117802433A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 82
- 239000000956 alloy Substances 0.000 title claims abstract description 82
- 229910010038 TiAl Inorganic materials 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000001192 hot extrusion Methods 0.000 claims description 28
- 238000004321 preservation Methods 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 description 16
- 239000000243 solution Substances 0.000 description 13
- 239000000314 lubricant Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 7
- 239000010963 304 stainless steel Substances 0.000 description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910004349 Ti-Al Inorganic materials 0.000 description 2
- 229910004692 Ti—Al Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910021362 Ti-Al intermetallic compound Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Abstract
The invention relates to the field of alloy processing, in particular to a TiAl-based alloy square billet bar, a preparation method and application thereof. According to the method, through twice extrusion, the extrusion ratio and the temperature are controlled, the grain size of the bar is fully refined, meanwhile, the uniformity of bar tissues is improved, the square billet bar has higher elongation and comprehensive performance along the extrusion direction, and the use reliability of the blank for the component is improved. A second object of the present invention is to provide a TiAl-based alloy billet and bar produced by the production method of a TiAl-based alloy billet and bar as described above, which has finer grain size and higher room temperature elongation.
Description
Technical Field
The invention relates to the field of alloy processing, in particular to a TiAl-based alloy square billet bar, a preparation method and application thereof.
Background
The TiAl alloy belongs to Ti-Al intermetallic compound materials and has excellent performances of low density, high specific strength, high specific modulus, high creep resistance, oxidation resistance, combustion resistance and the like, so that the TiAl alloy becomes a light high-temperature resistant structural material with great potential, is expected to replace the traditional nickel-based superalloy to become an important material for the hot end part of an aerospace engine, and has an important effect on improving the thrust ratio of the engine and increasing the temperature resistance grade of weaponry. Meanwhile, with the rapid development of hypersonic aircrafts in recent years, higher requirements are put forward on the operational maneuverability of the aircrafts in long-endurance, low-energy consumption and extremely high-heat environments, so that lower density, higher strength, higher use temperature and higher use reliability are required for materials.
TiAl alloy is the material with the lowest density and highest use temperature at present as a Ti-Al light high-temperature structural material, but the Ti-Al light high-temperature structural material cannot be applied in engineering due to the intrinsic room-temperature brittleness.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the invention is to provide a preparation method of a TiAl-based alloy square billet bar with high elongation, which controls the extrusion ratio and the temperature through twice extrusion, fully refines the grain size of the bar, improves the uniformity of bar structure, ensures that the square billet bar has higher elongation and comprehensive performance along the extrusion direction, and improves the use reliability of blanks for parts.
The second object of the invention is to provide the TiAl-based alloy square billet bar manufactured by the manufacturing method of the TiAl-based alloy square billet bar, which has rectangular cross section, uniform and fine grain size and high room temperature elongation.
A third object of the present invention is to provide the use of a ingot bar of a TiAl-based alloy as described above.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention provides a preparation method of a TiAl-based alloy square billet bar, which comprises the following steps:
(a) Performing first sheathing, first heat preservation and first hot extrusion on the TiAl-based alloy ingot to obtain a first blank;
wherein the temperature of the first heat preservation is 1230-1290 ℃, and the extrusion ratio of the first hot extrusion is 4-6:1;
(b) Performing second sheathing, second hot extrusion and second hot extrusion on the first blank to obtain a second blank;
wherein the temperature of the second heat preservation is 1230-1290 ℃, and the extrusion ratio of the second hot extrusion is 3-5:1;
(c) And carrying out solution treatment and aging treatment on the second blank to obtain the TiAl-based alloy square billet bar.
Further, the TiAl-based alloy cast ingot mainly comprises the following components in percentage by mass:
45% -47% of Al, 3% -6% of Nb, 0.4% -0.6% of Mo, 0.05% -0.09% of B, and the balance of Ti and unavoidable impurities.
Further, the grain size of the as-cast structure of the TiAl-based alloy ingot is 150-400 mu m.
Further, in the step (c), the time of the first heat preservation is 2-6 hours, and the time of the second heat preservation is 2-6 hours.
Further, in the step (c), the temperature of the solution treatment is 1180-1260 ℃ and the time is 3-6 h.
Further, in the step (c), the aging treatment is performed at a temperature of 900-980 ℃ for 8-24 hours.
The invention provides a TiAl-based alloy square billet bar prepared by the preparation method of the TiAl-based alloy square billet bar.
Further, the cross-sectional dimension of the TiAl-based alloy billet bar is (60-74) × (40-58) mm.
Further, the room temperature elongation of the TiAl-based alloy square billet bar is more than 4.0%.
Further, the TiAl-based alloy billet bar consists of equiaxed gamma grains and equiaxed lamellar clusters and a small amount of B 2 Phase composition wherein equiaxed lamellar clusters are composed of gamma phase and alpha phase 2 The phases are formed in a form of alternate layers;
wherein the volume dispersion of the gamma phase is 60% -77%, the volume fraction of the equiaxial lamellar blocks is 20% -40%, and B 2 The volume fraction of the phase is 0-3%.
The invention provides an application of the TiAl-based alloy square billet bar in preparing aerospace equipment.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the preparation method of the TiAl-based alloy square billet bar, provided by the invention, the grain size of the bar is fully refined by controlling the extrusion ratio and the temperature through twice extrusion, and meanwhile, the uniformity of bar structure is improved, so that the square billet bar has higher elongation and comprehensive performance along the extrusion direction, and the use reliability of the blank for the component is improved.
(2) The TiAl-based alloy square billet bar provided by the invention has finer grain size and higher room temperature elongation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a scanning electron microscope photograph of a TiAl-based alloy billet bar according to example 1 of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The terms "comprising" and "including" as used herein mean open ended or closed ended, unless otherwise noted. For example, the terms "comprising" and "comprises" may mean that other components not listed may be included or included, or that only listed components may be included or included.
The term "or" is inclusive in this invention, unless otherwise specified. For example, the phrase "a or B" means "a, B, or both a and B. More specifically, either of the following conditions satisfies the condition "a or B": a is true (or present) and B is false (or absent); a is false (or absent) and B is true (or present); or both A and B are true (or present).
In the present invention, "one or more" or "at least one" means any one, any two or more of the listed items unless specifically stated otherwise. Wherein "several" means any two or more.
In the present invention, unless specifically stated otherwise, the terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or as implicitly indicating the importance or quantity of the indicated technical feature. Moreover, the terms "first," "second," "third," "fourth," and the like are used for non-exhaustive list description purposes only, and are not to be construed as limiting the number of closed forms.
In a first aspect, the invention provides a method for preparing a TiAl-based alloy billet bar based on the consideration of improving the room-temperature elongation of a TiAl-based alloy, which comprises the following steps:
(a) Performing first sheathing, first heat preservation and first hot extrusion on the TiAl-based alloy ingot to obtain a first blank;
(b) Performing second wrapping, second heat preservation and second hot extrusion on the first blank to obtain a second blank;
(c) And carrying out solution treatment and aging treatment on the second blank to obtain the TiAl-based alloy square billet bar.
Further, the temperature of the first heat-retaining layer is 1230 to 1290 ℃, for example, 1230 ℃, 1240 ℃, 1250 ℃, 1270 ℃, 1290 ℃ or a range of values consisting of any two points.
Further, the extrusion ratio of the first hot extrusion is 4 to 6:1, for example, any one of the ratio columns or any two ratio ranges of 4:1, 4.2:1, 4.4:1, 4.6:1, 5:1, 5.2:1, 5.5:1, 5.6:1, 6:1.
Preferably, the first hot extrusion is a round bar extrusion.
Preferably, the first sheath may be a stainless steel sheath, but is not limited thereto.
Further, the temperature of the second heat preservation is 1230 to 1290 ℃, for example, 1230 ℃, 1240 ℃, 1250 ℃, 1270 ℃, 1290 ℃ or a range of values consisting of any one point value or any two point values.
Further, the extrusion ratio of the second hot extrusion is 3 to 5:1, for example, any one of the ratio columns or any two ratio ranges of 3:1, 3.2:1, 3.4:1, 3.6:1, 4:1, 4.2:1, 4.4:1, 4.6:1, 5:1.
Preferably, the second hot extrusion is a billet extrusion.
Preferably, the second jacket may be a stainless steel jacket, but is not limited thereto.
According to the invention, through twice extrusion, the extrusion ratio and the temperature are controlled, the grain size of the bar is fully thinned, and meanwhile, the uniformity of bar tissues is improved, so that the square billet bar has higher elongation and comprehensive performance along the extrusion direction, and the use reliability of the blank for the component is improved.
In some embodiments of the invention, the diameter of the round bar after the first hot extrusion is 120 to 160mm, for example any one or a range of values consisting of any two of 120mm, 130mm, 140mm, 150mm, 160 mm.
In some embodiments of the invention, the first hot extrusion or the second hot extrusion may be preceded by spraying a lubricant on the surface of the alloy billet.
In some embodiments of the invention, either the first hot extrusion or the second hot extrusion is in gamma phase + alpha 2 The two-phase region of the phase is in temperature interval.
In some embodiments of the present invention, a TiAl-based alloy ingot is composed mainly of the following components in mass percent:
45% -47% of Al, 3% -6% of Nb, 0.4% -0.6% of Mo, 0.05% -0.09% of B, and the balance of Ti and unavoidable impurities.
The TiAl-based alloy provided by the invention is simple in element types, reasonable in collocation, and the addition of Nb and Mo can improve the oxidation resistance of the TiAl-based alloy and has a solid solution strengthening effect. Particularly, the content of B is increased, the casting performance of the product is improved, the room temperature elongation, the room temperature strength and the high temperature strength of the TiAl alloy are comprehensively improved, and a basic guarantee is provided for subsequent bar processing and part preparation.
In some embodiments, the mass percent of Al, typically but not limited to, may be, for example, any point value or range of values of any two points in 45%, 45.1%, 45.2%, 45.5%, 45.8%, 46%, 46.2%, 46.6%, 46.7%, 46.8%, 46.9% and 47%.
In some embodiments, the mass percent of Nb may be, typically but not limited to, for example, any point value or range of values consisting of any two point values of 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%.
In some embodiments, the mass percent of Mo, typically but not limited to, may be, for example, any point value or range of values of any two point values of 0.4%, 0.42%, 0.45%, 0.48%, 0.5%, 0.54%, 0.56%, 0.58%, 0.6%.
In some embodiments, the mass percent of B, typically but not limited to, may be, for example, any point value or range of values consisting of any two point values, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%.
In some embodiments of the invention, the grain size of the as-cast structure of the TiAl-based alloy ingot is in the range of 150-400 μm, e.g., any one or any two point values of 150 μm, 2000 μm, 250 μm, 300 μm, 350 μm, 380 μm, 400 μm.
In some embodiments, the TiAl-based alloy ingot is treated and then hot extruded, comprising: and removing the as-cast surface defects by adopting a lathe to obtain the TiAl-based alloy cast ingot with the roughness less than or equal to Ra3.2mm. And (5) standby.
In some embodiments of the invention, in step (c), the first incubation time is for a second incubation time.
In some embodiments of the invention, in step (c), the temperature of the solution treatment is 1180 to 1260 ℃, e.g., 1180 ℃, 1200 ℃, 1220 ℃, 1240 ℃, 1260 ℃ or a range of values consisting of any one or both of the values; the time is 3-6 h, such as any one point value or any two point values in 3h, 4h, 5h and 6h.
In some embodiments of the invention, in step (c), the aging treatment is performed at a temperature ranging from 900 to 980 ℃, e.g., at any one or any two of 900 ℃, 920 ℃, 950 ℃, 980 ℃; the time is 8-24 h, such as any one point value or any range value formed by two point values of 8h, 10h, 15h, 18h, 20h and 24h.
In a second aspect, the invention provides a TiAl-based alloy billet bar prepared by the preparation method of the TiAl-based alloy billet bar.
The TiAl-based alloy square billet bar has finer grain size and room temperature elongation, and the room temperature elongation can be improved to more than 4.0%.
In some embodiments of the invention, the TiAl-based alloy billet has a diameter with a cross-sectional dimension of (60-74) × (40-58) mm, for example, a range of values consisting of any one or any two of 62×42mm, 60×40mm, 65×45mm, 70×45mm, 74×58 mm.
In some embodiments of the invention, the TiAl-based alloy billet is composed of equiaxed gamma grains and equiaxed lamellar clusters, and a small amount of B 2 Phase composition wherein equiaxed lamellar clusters are composed of gamma phase and alpha phase 2 The phases are formed in a form of alternate layers;
wherein the volume dispersion of the gamma phase is 60% to 77%, for example, a range of values consisting of any one or any two of 60%, 65%, 67%, 69%, 70%, 72%, 74%, 77%; the volume fraction of the equiaxed lamellar clusters is in the range of values consisting of 20% -40%, e.g. any point value or any two point values of 20%, 24%, 25%, 26%, 28%, 30%, 34%, 36%, 38%, 40%, B 2 The volume fraction of the phase is 0 to 3%, for example, any one point value or any two point values in 0, 1%, 2%, 3%.
Further, the grain size of the gamma phase is 3-10 mu m, alpha 2 The grain size of the phase is 10-20 mu m.
In a third aspect, the invention provides an application of a TiAl-based alloy square billet bar in preparing aerospace equipment.
The composition and mass ratio of the TiAl-based elements used in the embodiment of the invention are as follows: 46% of Al, 4% of Nb, 0.5% of Mo, 0.08% of B and the balance of Ti.
The preparation method of the TiAl-based alloy cast ingot comprises the following steps:
(1) Adopts 0 grade or above grade sponge titanium, alNb intermediate alloy, alMo intermediate alloy and AlB 3 The alloy was used as a raw material, and the raw materials were uniformly mixed according to the composition ratio shown in table 1, and then pressed into an electrode block on a press.
(2) The electrode blocks are welded to form a primary vacuum consumable smelting electrode, primary vacuum consumable smelting is carried out in a vacuum consumable smelting furnace, the smelting vacuum degree is lower than 5Pa, the primary crystallizer size is phi 300mm, the smelting current is controlled at 7kA, and the smelting voltage is 26V.
(3) And (3) welding the dead heads of the ingot subjected to primary vacuum consumable smelting outside the furnace to form a solidified shell electrode, and casting the ingot subjected to secondary vacuum solidified shell smelting to obtain a secondary solidified shell ingot with the diameter of 220 mm. The skull smelting current is 28kA, and the smelting stage voltage is 42V.
(4) And (3) after the two ends of the solidified shell ingot are flat-headed, welding in a furnace to obtain the electrode for three times of vacuum consumable smelting. Preheating treatment is carried out between the last vacuum consumable smelting, the preheating treatment temperature is 400 ℃, the time is 4 hours, and after the heat preservation is finished, hot materials are put into a vacuum consumable furnace of a phi 300mm crystallizer, and the last vacuum consumable smelting is carried out. The last consumable time needs to control small current melting, the smelting current is controlled to be 4.0kA, the smelting voltage is controlled to be 25V, and the smelting vacuum degree is lower than 5Pa.
Example 1
The preparation method of the TiAl-based alloy square billet bar provided by the embodiment comprises the following steps:
(1) The TiAl alloy cast ingot is sheathed by 304 stainless steel, glass lubricant is sprayed on the surface before first hot extrusion, then the cast ingot is heated and kept at 1260 ℃ for 4 hours, and the cast ingot is put into an extruder for extrusion and cogging after being discharged, and the extrusion ratio is 4.6:1, thus obtaining round bar blank with the diameter of 130 mm.
(2) Coating a round bar blank with the diameter of 130mm, spraying a glass lubricant on the surface of the coating before extrusion, heating and preserving heat for 4 hours at 1260 ℃, adopting a square die with the blank size for parts for an outlet die for second hot extrusion, and carrying out extrusion forming in an extruder at an extrusion ratio of 3.1:1 to obtain a square blank;
(c) And carrying out solution treatment on the square blank at 1260 ℃ for 3 hours, and carrying out aging treatment at 950 ℃ for 12 hours to obtain the 74 multiplied by 58 mmTiAl-based alloy square blank bar.
FIG. 1 is a photograph of the microstructure of example 1, wherein the structure of the final TiAl-based alloy billet is a bimodal structure, the structure is uniform, and the grain size is fine.
Example 2
The preparation method of the TiAl-based alloy square billet bar provided by the embodiment comprises the following steps:
(1) The TiAl alloy cast ingot is sheathed by 304 stainless steel, glass lubricant is sprayed on the surface before first hot extrusion, then the cast ingot is heated and kept at 1230 ℃ for 6 hours, and the cast ingot is put into an extruder for extrusion and cogging after being discharged, and the extrusion ratio is 4:1, thus obtaining round bar blank with the diameter of 130 mm.
(2) And (3) wrapping a round bar blank with the diameter of 130mm, spraying a glass lubricant on the surface of the wrapping before extrusion, heating at 1230 ℃ and preserving heat for 6 hours, adopting a square die with the blank size for parts as an outlet die for second hot extrusion, and carrying out extrusion forming in an extruder at an extrusion ratio of 4.2:1 to obtain a square blank with the diameter of 70 multiplied by 45 mm.
(3) And carrying out solution treatment on the square blank at 1230 ℃ for 6 hours, and carrying out aging treatment at 900 ℃ for 24 hours to obtain the TiAl-based alloy square blank bar.
Example 3
The preparation method of the TiAl-based alloy square billet bar provided by the embodiment comprises the following steps:
(1) The TiAl alloy cast ingot is sheathed by 304 stainless steel, glass lubricant is sprayed on the surface before first hot extrusion, then the cast ingot is heated and kept at 1290 ℃ for 4 hours, and the cast ingot is put into an extruder for extrusion and cogging after being discharged, and the extrusion ratio is 6:1, thus obtaining round bar blank with the diameter of 130 mm.
(2) Coating a round bar blank with the diameter of 130mm, spraying a glass lubricant on the surface of the coating before extrusion, heating and preserving heat for 4 hours at 1290 ℃, adopting a square die with the blank size for parts for extrusion forming in an extruder by adopting an outlet die for second hot extrusion, and obtaining a square blank with the extrusion ratio of 4.5:1, wherein the square blank is 65 multiplied by 45 mm;
(3) And carrying out solution treatment on the square blank at 1290 ℃ for 3 hours, and carrying out aging treatment at 980 ℃ for 8 hours to obtain the TiAl-based alloy square blank bar.
Comparative example 1
(1) The TiAl alloy cast ingot is sheathed by 304 stainless steel, glass lubricant is sprayed on the surface before first hot extrusion, then the cast ingot is heated and kept at 1260 ℃ for 4 hours, and the cast ingot is put into an extruder for extrusion and cogging after being discharged, and the extrusion ratio is 4.6:1, thus obtaining round bar blank with the diameter of 130 mm.
(2) And carrying out solution treatment on the round bar with the diameter of 130mm at 1260 ℃ for 3 hours, and carrying out aging treatment at 950 ℃ for 12 hours to obtain the TiAl-based alloy square billet bar.
Experimental example mechanical Property test
The TiAl-based alloy billets provided in examples 1 to 3 and comparative example 1 were tested for tensile strength, yield strength and elongation at room temperature. The results are shown in Table 1.
Table 1 results of mechanical properties test of TiAl-based alloy billets and bars
Compared with the traditional method, the invention adopts a production process of two-step extrusion of large-size fine grain cast ingot sense, thereby obtaining square-size bar for parts and realizing industrial production of TiAl alloy section bars. Meanwhile, as the as-cast structure of the large-size cast ingot is fine and the size is higher, the accumulated extrusion ratio of the two extrusions reaches more than 14, the grain size of the bar is fully refined, meanwhile, the uniformity of the bar structure is improved, the square billet bar has higher elongation along the extrusion direction and the matching of comprehensive performance, and the use reliability of the blank for the component is improved. In addition, the preparation method disclosed by the invention is simple to operate, short in flow, high in stability and suitable for industrial production.
While the invention has been illustrated and described with reference to specific embodiments, it is to be understood that the above embodiments are merely illustrative of the technical aspects of the invention and not restrictive thereof; those of ordinary skill in the art will appreciate that: modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some or all of the technical features thereof, without departing from the spirit and scope of the present invention; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; it is therefore intended to cover in the appended claims all such alternatives and modifications as fall within the scope of the invention.
Claims (10)
1. The preparation method of the TiAl-based alloy square billet bar is characterized by comprising the following steps of:
(a) Performing first sheathing, first heat preservation and first hot extrusion on the TiAl-based alloy ingot to obtain a first blank;
wherein the temperature of the first heat preservation is 1230-1290 ℃, and the extrusion ratio of the first hot extrusion is 4-6:1;
(b) Performing second sheathing, second hot extrusion and second hot extrusion on the first blank to obtain a second blank;
wherein the temperature of the second heat preservation is 1230-1290 ℃, and the extrusion ratio of the second hot extrusion is 3-5:1;
(c) And carrying out solution treatment and aging treatment on the second blank to obtain the TiAl-based alloy square billet bar.
2. The method for preparing the TiAl-based alloy billet bar according to claim 1, wherein the TiAl-based alloy ingot mainly comprises the following components in percentage by mass:
45% -47% of Al, 3% -6% of Nb, 0.4% -0.6% of Mo, 0.05% -0.09% of B, and the balance of Ti and unavoidable impurities;
preferably, the grain size of the as-cast structure of the TiAl-based alloy ingot is 150-400 mu m.
3. The method of producing a TiAl-based alloy billet and bar according to claim 1, wherein in step (c), the first heat-retaining time is 2 to 6 hours, and the second heat-retaining time is 2 to 6 hours.
4. The method for producing a TiAl-based alloy billet and bar according to claim 1, wherein in step (c), the solution treatment is performed at 1180 to 1260 ℃ for 3 to 6 hours.
5. The method for producing a TiAl-based alloy billet and bar according to claim 1, wherein in step (c), the aging treatment is carried out at a temperature of 900 to 980 ℃ for a time of 8 to 24 hours.
6. A TiAl-based alloy billet and bar produced by the process for producing a TiAl-based alloy billet and bar of any one of claims 1 to 5.
7. The TiAl-based alloy billet bar of claim 6 having a cross-sectional dimension of (60-74) × (40-58) mm.
8. The TiAl-based alloy billet bar of claim 6 wherein the room temperature elongation of the TiAl-based alloy billet bar is greater than 4.0%.
9. The TiAl-based alloy billet bar of claim 6, characterized in that it consists of equiaxed gamma grains and equiaxed lamellar clusters and a small amount of B 2 Phase composition wherein equiaxed lamellar clusters are composed of gamma phase and alpha phase 2 The phases are formed in a form of alternate layers;
wherein the volume dispersion of the gamma phase is 60% -77%, the volume fraction of the equiaxial lamellar blocks is 20% -40%, and B 2 The volume fraction of the phase is 0-3%.
10. Use of a bar of a TiAl-based alloy billet according to any one of claims 6-9 for the preparation of an aerospace device.
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| CN202311865450.2A Pending CN117802433A (en) | 2023-12-29 | 2023-12-29 | TiAl-based alloy square billet bar and preparation method and application thereof |
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| CN (1) | CN117802433A (en) |
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2023
- 2023-12-29 CN CN202311865450.2A patent/CN117802433A/en active Pending
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