CN115679233A - Method for casting titanium alloy through physical field solid state treatment and obtained titanium alloy - Google Patents
Method for casting titanium alloy through physical field solid state treatment and obtained titanium alloy Download PDFInfo
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Abstract
The invention relates to a method for casting titanium alloy by physical field solid state treatment and the obtained titanium alloy. A method of physical field solid state processing of cast titanium alloys comprising the steps of: performing at least one of cryogenic treatment and high-intensity magnetic field treatment on the titanium alloy casting; wherein, the cryogenic treatment comprises the following steps: treating for 30-40 h in an environment with the temperature of-180 ℃ to-210 ℃, preferably-196 ℃; the high-intensity magnetic field treatment comprises the following steps: the treatment is carried out at a magnetic field strength of 1.8 to 3.2T, preferably 3T. The invention utilizes the physical effects of a cryogenic low-temperature physical field and a strong pulse magnetic field to generate modified structure effects of grain refinement, dislocation density increase, preferred orientation, increased nano precipitated phase and the like in a metal material, thereby realizing the synchronous improvement of the toughness of the material through multiple strengthening and toughening factors.
Description
Technical Field
The application relates to the field of metal materials, in particular to a method for casting a titanium alloy through physical field solid state treatment and the obtained titanium alloy.
Background
The ZTC4 cast titanium alloy is an alpha + beta type titanium alloy, has medium strength and good comprehensive performance, is the cast titanium alloy which is most widely applied to aviation airplanes and engines at first, prepares a complex thin-wall structure casting through the processes of precision casting and the like, can be used for aviation engine fans, air compressors, blades, and middle beams, joints, bulkheads and connecting fasteners of airplane structures, and can reduce the weight by about 40 percent when replacing steel. The main problems of the prior ZTC4 cast titanium alloy are large performance dispersion and low strength, and the analysis is mainly caused by coarse grains and uneven structure, which are caused by the poor thermal conductivity of the titanium alloy, so that the solidification time is long, and the speed of crystal growth in the crystallization process is higher than that of crystal nucleus generation, so that the titanium alloy tends to form coarse grain structure; meanwhile, different positions of a casting in the casting solidification process have different microstructures due to different cooling speeds caused by factors such as structure, process and the like. The titanium alloy casting cannot completely meet the design index requirements of long service life and high reliability due to the problems, so that the cast titanium alloy has a key technical bottleneck in the aspect of regulating and controlling the structure performance, and the application of the titanium alloy casting is limited to a greater extent.
In addition to the application fields of aerospace, petrochemical, marine and biomedical engineering, titanium alloys are considered to be very promising light low-temperature structural metal materials for advanced liquid fuel rocket engines, lunar devices and superconducting equipment manufacturing. With the development of industrial economy, particularly aviation industry, as materials widely demanded in various high-precision fields, new technologies for designing, preparing and applying titanium and alloys thereof are concerned, mainly the design of new titanium alloy types, the improvement of the toughness and other comprehensive use performances of the titanium alloy and the like to expand the application thereof, and the aim is to shorten, catch up and exceed the gap between the titanium alloy and advanced foreign countries in the titanium alloy manufacturing industry.
In the prior reports of the structure property regulation and control technology and the application research of the titanium alloy, there are several methods for improving the comprehensive properties of the titanium alloy, such as the toughness and the like: the first is thermal mechanical processing, mainly plastic deformation, and the method is suitable for processing high-strength and high-toughness titanium alloy plates and bars, and is not suitable for casting titanium alloys, particularly titanium alloys formed by precision casting. The second is a heat treatment process, for casting titanium alloys, annealing only removes the casting stress, while solution treatments above 900 ℃ tend to cause dimensional distortion in precision castings. The potential of the traditional heat treatment method for improving the performance of the titanium alloy is basically seen.
The invention is therefore proposed.
Disclosure of Invention
In view of the above problems, the present application mainly provides a method for solid-state processing of cast titanium alloy by using a physical field, which utilizes the physical effects of a cryogenic low-temperature physical field and a strong pulsed magnetic field to generate modified structure effects such as grain refinement, dislocation density increase, preferred orientation, increased nano precipitated phases and the like in a metal material, further realizes synchronous improvement of toughness of the material by multiple strengthening and toughening factors, has the advantages of low cost, low pollution, high efficiency and high quality, and can meet the continuously increasing application requirements in the fields of aerospace and transportation.
In order to achieve the above object, the present invention provides the following technical solutions.
In a first aspect the present invention provides a method of physical field solid state processing of cast titanium alloys comprising the steps of:
performing at least one of cryogenic treatment and high-intensity magnetic field treatment on the titanium alloy casting;
wherein, the cryogenic treatment comprises the following steps: treating for 30-40 h in an environment with the temperature of-180 ℃ to-210 ℃, preferably-196 ℃;
the high-intensity magnetic field treatment comprises the following steps: the treatment is carried out at a magnetic field strength of 1.8 to 3.2T, preferably 3T.
The mechanical property of the titanium alloy casting can be obviously improved by adopting at least one of cryogenic treatment and high-intensity magnetic field treatment. For example, the cryogenic treatment has the beneficial effects of improving density, refining crystal grains, improving dislocation density, promoting the generation of twin and sub-crystal structures, promoting phase transformation and phase precipitation and promoting the generation of textures, and comprehensive mechanical properties such as toughness and the like of the titanium alloy can be comprehensively improved through a multi-element strengthening and toughening mechanism such as fine crystal strengthening, dislocation strengthening, precipitation strengthening, texture strengthening and the like. The high-intensity magnetic field can induce the phase change of the alloy, and can reduce the residual stress caused by work hardening, after the magnetic field is applied, the dislocation density in the material is further increased, but the critical shear stress of dislocation motion can be reduced due to the magnetic field, and the electron spin state of a free radical pair is changed, so that the dislocation is removed from barriers such as a grain boundary, the flexibility of dislocation motion is improved, the number of movable dislocations is increased, the plastic deformation capability of the material is improved, and the work hardening is relieved. Therefore, the mechanical properties such as tensile strength, elongation and the like of the titanium alloy casting can be obviously improved through one of cryogenic treatment and high-intensity magnetic field treatment, the improvement range of the tensile strength is at least more than 2%, and the improvement range of the elongation is at least more than 8.5%. Meanwhile, in the treatment process of the physical fields, on the premise that the macroscopic size of the casting is not changed, the structure and the performance of the titanium alloy can be accurately regulated and controlled by regulating and controlling the implementation sequence of the multiple physical fields and the parameters of the physical fields, the uniform and synchronous promotion of the obdurability can be realized, and the important practical value of the titanium alloy is excavated.
In addition, the treatment method and conditions of the present invention are mainly directed to cast titanium alloys, but specific compositions of titanium alloys are not particularly limited, and mainly refer to titanium-based alloys, including but not limited to Ti-6Al-4V, ti-5Al-2.5Sn, ti-2Al-2.5Zr, ti-32Mo, ti-Mo-Ni, ti-Pd, SP-700, ti-6242, ti-10-5-3, ti-1023, BT9, BT20, IMI829, IMI834, and the like, and more preferably ZTC4.
The temperature in the deep cooling treatment can be adjusted within the range of-180 ℃ to-210 ℃, including but not limited to-180 ℃, 185 ℃, 190 ℃, 195 ℃, 196 ℃, 200 ℃, 205 ℃, 210 ℃ and the like, and the preferred ranges are-185 ℃ to-196 ℃, 190 ℃ to-200 ℃ and the like.
The magnetic field intensity of the high-intensity magnetic field treatment can be adjusted within the range of 1.8-3.2T, including but not limited to 1.8T, 1.9T, 2.0T, 2.3T, 2.5T, 2.7T, 2.9T, 3T, 3.1T, 3.2T and the like.
The order and conditions of the two treatments in the above process can be further modified to further enhance the material properties.
Further, the titanium alloy is subjected to the cryogenic treatment or the high-intensity magnetic field treatment. The two schemes are alternative treatment, so that the method not only has the effect of improving the toughness, but also has the characteristics of simple operation and visible effect.
Further, carry out titanium alloy in proper order the deep cold treatment with high magnetic field is handled, or carries out in proper order the high magnetic field is handled with the deep cold treatment. The two schemes are to carry out multiple physical field treatments step by step, and the effect is more obvious than that of a single field.
Further, the subzero treatment and the high-intensity magnetic field treatment are simultaneously carried out on the titanium alloy. The scheme couples deep cooling and a strong magnetic field, generates a synergistic effect, and has better and obvious effect compared with step-by-step multiple physical field treatment.
Further, the high magnetic field treatment is performed in a pulsed manner and/or a constant manner.
The two modes can improve the mechanical property of the titanium alloy casting, wherein the treatment effect of the pulse mode is better.
Further, the pulse-mode high-intensity magnetic field treatment comprises the following steps: the pulse interval is 25-35 s. The pulse interval herein refers to the frequency at which each pulse is processed.
Further, the high-intensity magnetic field treatment is carried out in a pulse mode, and the pulse magnetic field treatment is carried out at intervals of 4-9 h in the cryogenic treatment process; the pulse interval in each pulse magnetic field treatment is 25-35 s, 10-25 min totally, apply 25-35 pulses. It is essential that "one pulse magnetic field treatment" is distinguished from "one pulse", the former referring to one complete treatment cycle and the latter referring to one pulse in one cycle. In the coupling treatment of two kinds of physical fields, when the interval time increases along 4h → 6h → 9h, the number of times of the pulsed magnetic field decreases progressively, the strength and toughness improvement effect also tends to decrease progressively, and taking the cost performance into consideration comprehensively, it is better to perform the pulsed magnetic field treatment once every 6 h.
Further, the titanium alloy casting is cast in a non-limiting manner, including but not limited to, investment/graphite/sand casting or smelting and casting, followed by hot isostatic pressing and annealing to eliminate casting defects. Meanwhile, the performance improvement range of the titanium alloy in different casting modes after the same physical field treatment is not obviously different. Therefore, in actual production, titanium alloy castings of different casting modes can be selected adaptively.
A second aspect of the invention provides a titanium alloy obtainable by the method described above.
In summary, compared with the prior art, the invention achieves the following technical effects:
(1) The cryogenic treatment can effectively improve the mechanical properties of the material, has very obvious effect on the titanium alloy, has the beneficial effects of improving the compactness, refining crystal grains, improving the dislocation density, promoting the generation of twin crystal and sub-crystal tissues, promoting phase transformation and phase precipitation and promoting the generation of the texture, and comprehensively improves the comprehensive mechanical properties such as the obdurability and the like of the titanium alloy through multiple obdurability mechanisms such as fine crystal strengthening, dislocation strengthening, precipitation strengthening, texture strengthening and the like;
(2) The strong magnetic field can induce the phase transformation of the alloy and can reduce the residual stress caused by work hardening. After a magnetic field is applied, the dislocation density in the material is further increased, but the critical shear stress of dislocation motion can be reduced due to the magnetic field, and the electron spin state of a free radical pair is changed, so that the dislocation is de-pinned from barriers such as a grain boundary, the flexibility of dislocation motion is improved, the number of movable dislocations is increased, the plastic deformation capacity of the material is improved, and the processing hardening is relieved.
(3) The coupling of the deep cooling treatment and the high-intensity magnetic field treatment has better effect and has synergistic effect.
(4) The titanium alloy obtained by the invention can be used for parts on aviation airplanes and engines, and meets the requirements of long service life, high stability and the like, including but not limited to aviation engine fans, gas compressors, blades, airplane structure middle beams, joints, bulkheads, connecting fasteners and the like.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:
fig. 1 to 5 show the microstructures of titanium alloys obtained by solid state processing in different physical fields.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two).
The effect of different physical fields on the titanium alloy is described below by way of example for the treatment of titanium alloy ZTC4, but this is not intended to limit the type of titanium alloy of the present invention.
Example 1: single cryogenic treatment
The titanium alloy ZTC4 used in this example had the composition, in mass%, of 6.2% Al, 4.3% V, 0.19% Fe, 0.18% O, 0.02% C, and the balance Ti. The titanium alloy casting is prepared by adopting an investment/graphite mold/sand mold casting process, and then the casting is subjected to hot isostatic pressing for 2 hours at 930 ℃, so that the casting defects are eliminated, and the defects which cannot be eliminated need to be positioned, cleaned and repaired. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3h, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding.
Selecting a temperature-controlled soaking dual-function cryogenic device, controlling an electromagnetic valve through a computer to adjust the cooling speed inside a cryogenic box to 10 ℃/min, immersing the casting into liquid nitrogen after the temperature of the liquid nitrogen reaches-196 ℃, taking out the casting after soaking for 36h, placing the casting at room temperature, and carrying out tissue performance detection after the casting recovers to a normal state within 12 h-24 h. FIGS. 1 and 2 are microstructures of blank and cryogenic 36h castings showing an increased number of intracrystalline precipitates in the cryogenically treated alloy. The performance results are shown in Table 1. Experimental data show that the cryogenic treatment can effectively improve the toughness.
Example 2: magnetic field treatment alone
The titanium alloy ZTC4 used in this example comprises, by mass, 6.2% of Al, 4.3% of V, 0.19% of Fe, 0.18% of O, 0.02% of C, and the balance Ti. The titanium alloy casting is prepared by adopting an investment/graphite mold/sand mold casting process, and then the casting is subjected to hot isostatic pressing for 2 hours at 930 ℃, so that the casting defects are eliminated, and the defects which cannot be eliminated need to be positioned, cleaned and repaired. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3h, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding.
Selecting a strong pulse magnetic field generating device to carry out strong pulse magnetic field solid-state treatment on the casting, placing the casting in a pulse magnetic field tool coil, regulating and controlling the magnetic induction intensity to be 3T, controlling the interval of two pulses to be 30s, carrying out co-treatment for 15min, controlling the total number of time pulses to be 30, finishing the magnetic field treatment operation after the set pulse number is reached, standing the casting in a room temperature environment, and recovering the normal state after 12-24 h to carry out tissue performance detection. FIG. 3 is a microstructure view of a titanium alloy treated with a pulsed magnetic field, and it can be seen that the amount of intragranular precipitates in the alloy increases after the treatment. The performance results are shown in Table 1. Experimental data show that the magnetic field treatment can effectively improve the toughness.
Example 3: cryogenic-magnetic field sequence regulation treatment
The titanium alloy ZTC4 used in this example had the composition, in mass%, of 6.2% Al, 4.3% V, 0.19% Fe, 0.18% O, 0.02% C, and the balance Ti. The titanium alloy casting is prepared by adopting an investment/graphite mold/sand mold casting process, and then the casting is subjected to hot isostatic pressing for 2 hours at 930 ℃, so that the casting defects are eliminated, and the defects which cannot be eliminated need to be positioned, cleaned and repaired. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3 hours, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding.
Selecting a temperature-controlled soaking dual-function cryogenic device, controlling an electromagnetic valve by a computer to adjust the cooling speed inside a cryogenic box to 10 ℃/min, soaking the casting into liquid nitrogen after the temperature of the liquid nitrogen reaches-196 ℃, taking out the casting after soaking for 36 hours, placing the casting at room temperature, and placing for 12-24 hours. And then selecting a strong pulse magnetic field generating device to carry out strong pulse magnetic field solid-state treatment on the casting, placing the casting in a pulse magnetic field tool coil, regulating and controlling the magnetic induction intensity to be 3T, regulating the interval of two pulses to be 30s, carrying out co-treatment for 15min, wherein the total number of time pulses is 30, finishing the magnetic field treatment operation after the set pulse number is reached, standing the casting in a room temperature environment, and carrying out tissue performance detection after 12-24 h. FIG. 4 is a microstructure diagram of a titanium alloy treated by cryogenic magnetic field sequence adjustment, and the number of intra-granular precipitated phases in the treated alloy is obviously increased. The performance results are shown in Table 1. Experimental data show that the cryogenic magnetic field order-adjusting treatment can obviously improve the toughness.
Example 4: magnetic field-cryogenic sequence-regulating treatment
The titanium alloy ZTC4 used in this example had the composition, in mass%, of 6.2% Al, 4.3% V, 0.19% Fe, 0.18% O, 0.02% C, and the balance Ti. The titanium alloy casting is prepared by adopting an investment/graphite mold/sand mold casting process, and then the casting is subjected to hot isostatic pressing for 2 hours at 930 ℃, so that the casting defects are eliminated, and the defects which cannot be eliminated need to be positioned, cleaned and repaired. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3 hours, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding.
The casting is placed in a pulse magnetic field coil, the output voltage and the output current are adjusted to change the magnetic induction intensity of the coil, and the pulse interval and the number of pulses are adjusted. The method specifically comprises the following steps: a square casting of 30mm square was placed in a pulse magnetic field coil, the output voltage and current values were adjusted so that the magnetic induction reached 3T (Tesla), the pulse application process was manually controlled, pulses were applied every 30 seconds for 15 minutes, for a total of 30 pulses. Then the casting is put into a temperature-controlled soaking dual-function deep cooling device, the electromagnetic valve is controlled by a computer to adjust the cooling speed of the interior of the deep cooling box to 10 ℃/min, the casting is soaked in liquid nitrogen after the temperature of the liquid nitrogen reaches-196 ℃, and the casting is taken out and placed at room temperature after being soaked for 36 h. And standing for 12-24 h after the treatment is finished, and detecting the tensile property of the material. The tensile properties of the alloy treated with a pulsed magnetic field under these conditions are shown in Table 1.
Example 5: magnetic field cryogenic coupling treatment-static magnetic field
The titanium alloy ZTC4 used in this example had the composition, in mass%, of 6.2% Al, 4.3% V, 0.19% Fe, 0.18% O, 0.02% C, and the balance Ti. The titanium alloy casting is prepared by precision casting molding after induction melting by adopting an investment mold/graphite mold/sand mold casting process, and then the casting is subjected to hot isostatic pressing for 2 hours at 930 ℃, so that the casting defect is eliminated, and the defect which cannot be eliminated needs to be positioned, cleaned and subjected to repair welding. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3h, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding. The aim is to eliminate internal stresses that arise during casting and hot isostatic pressing.
And (3) placing the casting in a deep cooling tank, then placing the deep cooling tank in a magnetic field generating device, starting a magnetic field when the middle 17h is selected in the 36h deep cooling process, regulating and controlling the magnetic induction intensity to be 3T, and carrying out magnetic field treatment for 90 min. The performance results are shown in Table 1.
Example 6: magnetic field cryogenic coupling treatment-pulse magnetic field
The titanium alloy ZTC4 used in this example had the composition, in mass%, of 6.2% Al, 4.3% V, 0.19% Fe, 0.18% O, 0.02% C, and the balance Ti. The method comprises the steps of preparing a titanium alloy casting through precision casting molding after induction melting by adopting a fired mold/graphite mold/sand mold casting process, and then hot isostatic pressing the casting for 2 hours at 930 ℃, so that casting defects are eliminated, and positioning cleaning and repair welding are required for the defects which cannot be eliminated. And then placing the casting in a box furnace, heating to 730 ℃, preserving heat for 3h, and cooling to room temperature along with the furnace, so as to eliminate internal stress generated by casting, hot isostatic pressing and repair welding. The aim is to eliminate internal stresses that arise during casting and hot isostatic pressing.
The casting is placed in a deep cooling tank, then the deep cooling tank is placed in a magnetic field generating device, a pulse magnetic field is applied once at intervals of 6 hours in the 36h deep cooling process, the magnetic induction intensity is regulated to be 3T, the pulse interval is 30s, 15min is totally spent, 30 pulses are applied, and 6 times of pulse magnetic field treatment are carried out in the whole 36h deep cooling process. FIG. 5 is a microstructure diagram of a titanium alloy treated by cryogenic magnetic field coupling, and it can be seen that the increase of the number of intragranular precipitated phases in the treated alloy is very significant. The performance results are shown in Table 1. Experimental data show that the cryogenic magnetic field coupling treatment can obviously improve the toughness of the alloy.
Example 7
The method adopts vacuum consumable arc melting ZTC4 to cast titanium alloy ingots, and the chemical components of the ingots meet the requirements of ZTC4 chemical components in GJB 2896A-2020. The casting blank is formed by adopting an investment precision casting mode, the smelting and pouring equipment is a vacuum consumable skull smelting furnace, and the pouring mode is gravity pouring. And (3) performing hot isostatic pressing treatment on the blank after casting and forming, wherein hot isostatic pressing technological parameters are that argon pressure is not lower than 100MPa, hot pressing temperature is 899-954 ℃, heat preservation time is 2-4 h, and the blank is cooled to 300 ℃ along with a furnace, so that casting defects are eliminated. Then, stress relief annealing is carried out, the temperature is raised at the rate of 10 ℃/min, after 63 minutes, the temperature is raised to 650 ℃, the temperature is kept for 90 minutes, and furnace cooling is carried out subsequently.
The casting is placed in a deep cooling tank, then the deep cooling tank is placed in a magnetic field generating device, a pulse magnetic field is applied once at intervals of 6 hours in the 36h deep cooling process, the magnetic induction intensity is regulated to be 3T, the pulse interval is 30s, 15min is totally spent, 30 pulses are applied, and 6 times of pulse magnetic field treatment are carried out in the whole 36h deep cooling process. The resulting alloy was examined for tensile strength and elongation, which were not significantly different from those of example 6.
The change in tensile strength and the change in elongation of the titanium alloy obtained in the above example are shown in table 1.
TABLE 1 Properties of titanium alloys obtained in different examples
The data in table 1 show that the deep cooling and strong magnetic field coupling treatment can generate synergistic effect, and the improvement on the material performance is more effective.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (10)
1. A method of solid state processing a cast titanium alloy in a physical field, comprising the steps of:
performing at least one of cryogenic treatment and high-intensity magnetic field treatment on the titanium alloy casting;
wherein, the subzero treatment comprises the following steps: treating for 30-40 h in an environment with the temperature of-180 ℃ to-210 ℃, preferably-196 ℃;
the high-intensity magnetic field treatment comprises the following steps: the treatment is carried out at a magnetic field strength of 1.8 to 3.2T, preferably 3T.
2. The method of claim 1, wherein said cryogenic treatment or said high magnetic field treatment is performed on a titanium alloy.
3. The method according to claim 1, wherein said cryogenic treatment and said high-intensity magnetic field treatment are performed in sequence on a titanium alloy, or said high-intensity magnetic field treatment and said cryogenic treatment are performed in sequence.
4. The method of claim 1, wherein said cryogenic treatment and said high magnetic field treatment are performed simultaneously on a titanium alloy.
5. Method according to any one of claims 1 to 4, characterized in that the high-intensity magnetic field treatment is carried out in a pulsed and/or constant manner.
6. The method of claim 5, wherein the pulsed, high-intensity magnetic field treatment is: the pulse interval is 25-35 s.
7. The method according to claim 4, wherein the high magnetic field treatment is performed in a pulsed manner, and the pulsed magnetic field treatment is performed every 4 to 9 hours during the cryogenic treatment; the pulse interval in each pulse magnetic field treatment is 25-35 s, 10-25 min totally, apply 25-35 pulses.
8. The method according to claim 7, wherein the pulsed magnetic field treatment is performed every 6 hours during the cryogenic treatment.
9. The method of claim 1, wherein the titanium alloy is ZTC4.
10. A titanium alloy obtainable by the method of any one of claims 1 to 9.
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| 费爱庚: ""磁场深冷处理TC4钛合金的微观组织和力学性能的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 03, pages 022 - 69 * |
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