CN116240478B - Heat treatment method for improving strength of metastable beta titanium alloy to more than 1400MPa - Google Patents
Heat treatment method for improving strength of metastable beta titanium alloy to more than 1400MPa Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 190
- 239000000956 alloy Substances 0.000 title claims abstract description 88
- 229910001040 Beta-titanium Inorganic materials 0.000 title claims abstract description 73
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000032683 aging Effects 0.000 claims abstract description 60
- 238000010791 quenching Methods 0.000 claims abstract description 38
- 230000000171 quenching effect Effects 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 abstract description 26
- 238000009826 distribution Methods 0.000 abstract description 7
- 239000006104 solid solution Substances 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 8
- 239000007769 metal material Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000009864 tensile test Methods 0.000 description 8
- 238000010998 test method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 4
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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Abstract
The invention discloses a heat treatment method for improving the strength of metastable beta titanium alloy to more than 1400MPa, which comprises the following steps: firstly, heating a metastable beta titanium alloy material to 10-30 ℃ below a beta transformation point, carrying out solution heat treatment, and carrying out water quenching to room temperature; then heating the metastable beta titanium alloy material subjected to solution heat treatment to 300 ℃, preserving heat for 10-100 hours, performing low-temperature aging heat treatment, and performing water quenching to room temperature; and finally, heating the metastable beta titanium alloy material subjected to the low-temperature aging heat treatment to 500-550 ℃, performing high-temperature aging heat treatment, and performing water quenching to room temperature. According to the invention, the distribution and the size of the secondary alpha phase in the metastable beta titanium alloy microstructure are regulated and controlled through solid solution and aging heat treatment, so that the needle-shaped secondary alpha phase with the average long axis size smaller than 140nm and the short axis size smaller than 55nm, which are uniformly dispersed and distributed in beta grains, is obtained, and the strength of the metastable beta titanium alloy is remarkably improved to more than 1400 MPa. The invention can expand the application range of the metastable beta titanium alloy in the field of aviation industry.
Description
Technical Field
The invention belongs to the technical field of titanium alloy, and particularly relates to a heat treatment method for improving the strength of metastable beta titanium alloy to more than 1400 MPa.
Background
In recent years, various military and civil aircrafts in the aviation industry field have raised higher and higher requirements on light weight, long service life, high reliability and the like, and the continuous realization of the structural weight reduction of the aircrafts is urgently needed. The metastable beta titanium alloy has the characteristics of high specific strength, deep hardenability, excellent corrosion resistance and the like, becomes an ideal alternative material for large-scale key bearing structural members of various novel airplanes, and is used for manufacturing landing gear of new generation civil airliners such as air passenger A380, boeing 787 and the like. In landing gear for these aircraft, significant structural weight loss is achieved by replacing the original high strength steel components with metastable beta titanium alloy components. However, it is notable that the service strength level of the typical commercial metastable beta titanium alloy (such as Ti-5553, ti-1023, ti-55531, etc.) at home and abroad is generally not more than 1300MPa, and the strength level of the ultra-high strength steel (up to more than 2000 MPa) is quite different. In most cases, the microstructure and mechanical properties of these metastable beta titanium alloys are primarily controlled by solution and aging heat treatments. Comprehensively analyzing the characteristics of the metastable beta titanium alloy, the high strength of the metastable beta titanium alloy is mainly derived from the dispersion strengthening effect of alpha phase precipitated in the aging heat treatment process. The usual aging heat treatment regimes for these metastable beta titanium alloys are: the temperature is kept at 450 to 650 ℃ for 4 to 8 hours, and then the mixture is cooled to room temperature in air. After the aging heat treatment, a large amount of secondary alpha phases are separated out from the alloy, the strength of the alloy is obviously increased, but the distribution of the secondary alpha phases is often uneven, the size is large, and the improvement amplitude of the alloy strength is limited. For any metastable beta titanium alloy, the distribution and size of secondary alpha phase are closely related to the content of the primary alpha phase remained after solution heat treatment, aging temperature, aging time and the like. For example, the higher the primary alpha phase content, the more non-uniform the secondary alpha phase distribution; the higher the ageing temperature and the longer the ageing time, the larger the secondary alpha phase size. Therefore, the solid solution and aging heat treatment system of the metastable beta titanium alloy is reasonably designed, so that the metastable beta titanium alloy generates secondary alpha phase which is uniformly dispersed and distributed and has small size, and the key of further improving the strength level of the metastable beta titanium alloy is realized. Based on the above, the application provides a heat treatment method for improving the strength of metastable beta titanium alloy to more than 1400 MPa.
Disclosure of Invention
Considering that the strength of the metastable beta titanium alloy is closely related to the distribution and the size of the secondary alpha phase, the distribution and the size of the secondary alpha phase can be regulated and controlled through solid solution and aging heat treatment, designing a reasonable solid solution and aging heat treatment method to obtain the secondary alpha phase with uniform dispersion distribution and small size is a key for solving the problem that the service strength level of the conventional commercial metastable beta titanium alloy is lower (not more than 1300 MPa).
Based on the above consideration, the application provides a heat treatment method for improving the strength of the metastable beta titanium alloy to more than 1400MPa, aiming at the problems that the service strength level of the existing commercial metastable beta titanium alloy is low, and the existing commercial metastable beta titanium alloy is difficult to further replace the ultra-high strength steel with a higher strength level so as to realize weight reduction of an aircraft structure. The method comprises the following steps:
Step 1, heating a metastable beta titanium alloy material to a temperature 10-30 ℃ below a beta transformation point, carrying out solution heat treatment, and then quenching the metastable beta titanium alloy material to room temperature;
step 2, heating the metastable beta titanium alloy material subjected to solution heat treatment to 300 ℃, preserving heat for 10-100 hours, performing low-temperature aging heat treatment, and then performing water quenching to room temperature;
And step 3, heating the metastable beta titanium alloy material subjected to the low-temperature aging heat treatment to 500-550 ℃, performing high-temperature aging heat treatment, and then quenching the metastable beta titanium alloy material to room temperature.
As a further explanation of the invention, in the microstructure of the metastable beta titanium alloy material after the solution heat treatment and water quenching in the step 1, the average size of beta grains is 75-85 μm, the average size of primary alpha phase is 2.1-3.6 μm, and the content of primary alpha phase is 1.4-2.5%.
As a further explanation of the invention, isothermal omega phase with average size more than 5nm which is uniformly dispersed and distributed in beta grains is obtained after the low-temperature aging heat treatment and water quenching in the step 2.
As a further explanation of the invention, the needle-shaped secondary alpha phase with the average long axis size smaller than 140nm and the short axis size smaller than 55nm which are uniformly dispersed and distributed in the beta grains is obtained after the high-temperature aging heat treatment and water quenching in the step 3.
As a further explanation of the present invention, the metastable beta titanium alloy material is Ti-10V-2Fe-3Al alloy, ti-5Al-5Mo-5V-3Cr-0.5Fe alloy or Ti-5Al-5V-5Mo-3Cr-1Zr alloy.
As a further illustration of the present invention, the solution heat treatment has a hold time of greater than or equal to 0.5 hours.
As a further illustration of the invention, the incubation time for the high temperature aging heat treatment is 2 hours.
As a further explanation of the present invention, the heat treatments are all performed in a resistance furnace, and the atmosphere is vacuum or air.
As a further illustration of the present invention, the heat treatments were all heated to Wen Zhuangliao.
As a further illustration of the present invention, the metastable beta titanium alloy material requires degreasing prior to heat treatment and removal of surface scale after heat treatment.
Compared with the prior art, the invention has the following advantages:
The application breaks the traditional mode of one-step high-temperature aging heat treatment, creatively provides a gradient heat treatment system of solution-low-temperature long aging-high-temperature short aging, and makes the secondary alpha phase in the existing commercial metastable beta titanium alloy uniformly dispersed and distributed and obviously refined by the simple solid solution and aging heat treatment mode to obtain needle-shaped secondary alpha phase with average long axis size smaller than 140nm and short axis size smaller than 55nm, which is uniformly dispersed and distributed in beta grains, thereby obviously improving the strength of the existing commercial metastable beta titanium alloy to more than 1400MPa, and improving the strength of the existing commercial metastable beta titanium alloy to more than 1600MPa under the optimal solid solution and aging heat treatment condition. The heat treatment method provided by the application can expand the application range of metastable beta titanium alloy in the field of aviation industry, and can realize further weight reduction of an aircraft structure by replacing active ultra-high strength steel with higher strength level.
Drawings
FIG. 1 is a microstructure image of a metastable beta titanium alloy of examples 1-4 of the present application after solution heat treatment.
FIG. 2 is a microstructure photograph of omega phase generated by subjecting a metastable beta titanium alloy of example 1 of the present application to a low temperature aging heat treatment of 300℃for 10 hours.
Fig. 3 is a microstructure image of a metastable beta titanium alloy in examples 1-2 of the present application after a low temperature aging heat treatment and a high temperature aging heat treatment.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Examples
Ti-5Al-5V-5Mo-3Cr-1Zr alloy bar is selected as raw material, and the beta transformation point is 830 ℃ measured by a metallographic method. Samples were taken from the bars and subjected to the following heat treatments:
S1, heating a sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching with water to room temperature to obtain a microstructure with average beta grain size of 79 mu m, average primary alpha phase size of 2.9 mu m and primary alpha phase content of 2.1 percent, wherein the result is shown in figure 1.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, preserving heat for 10 hours, and then quenching the sample to room temperature to obtain isothermal omega phase with average size of 10nm, wherein the isothermal omega phase is uniformly dispersed and distributed in beta grains.
S3, heating the sample subjected to the low-temperature aging heat treatment to 520 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching with water to room temperature to obtain needle-shaped secondary alpha phases which are uniformly and diffusely distributed in beta grains and have average long axis sizes of 130nm and short axis sizes of 41nm, wherein the result is shown in figure 3.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1470MPa and the tensile strength is 1530MPa.
Examples
Ti-5Al-5V-5Mo-3Cr-1Zr alloy bar is selected as raw material, and the beta transformation point is 830 ℃ measured by a metallographic method. Samples were taken from the bars and subjected to the following heat treatments:
S1, heating a sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching with water to room temperature to obtain a microstructure with average beta grain size of 79 mu m, average primary alpha phase size of 2.9 mu m and primary alpha phase content of 2.1 percent, wherein the result is shown in figure 1.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, and carrying out water quenching to room temperature after heat preservation for 100 hours to obtain isothermal omega phase with average size of 50nm, wherein the isothermal omega phase is uniformly dispersed and distributed in beta grains.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 520 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching with water to room temperature to obtain needle-shaped secondary alpha phases which are uniformly and diffusely distributed in beta grains and have average long axis sizes of 62nm and short axis sizes of 25nm, wherein the result is shown in a figure 3.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1620MPa and the tensile strength is 1673MPa.
Examples
Ti-10V-2Fe-3Al alloy bar is selected as a raw material, and the beta transformation point is 805 ℃ measured by a metallographic method. Samples were taken from the bars and subjected to the following heat treatments:
S1, heating a sample to 795 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching with water to room temperature to obtain a microstructure with an average beta grain size of 85 mu m, an average primary alpha phase size of 2.6 mu m and a primary alpha phase content of 1.6%, wherein the result is shown in figure 1.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, preserving heat for 10 hours, and then quenching the sample to room temperature to obtain isothermal omega phase with average size of 15nm, wherein the isothermal omega phase is uniformly dispersed and distributed in beta grains.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 500 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature to obtain needle-shaped secondary alpha phases which are uniformly and diffusely distributed in beta grains and have average long axis sizes of 85nm and short axis sizes of 35 nm.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1520MPa and the tensile strength is 1580MPa.
Examples
Ti-10V-2Fe-3Al alloy bar is selected as a raw material, and the beta transformation point is 805 ℃ measured by a metallographic method. Samples were taken from the bars and subjected to the following heat treatments:
S1, heating a sample to 795 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching with water to room temperature to obtain a microstructure with an average beta grain size of 85 mu m, an average primary alpha phase size of 2.6 mu m and a primary alpha phase content of 1.6%, wherein the result is shown in figure 1.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, preserving heat for 10 hours, and then quenching the sample to room temperature to obtain isothermal omega phase with average size of 15nm, wherein the isothermal omega phase is uniformly dispersed and distributed in beta grains.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 550 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature to obtain needle-shaped secondary alpha phases which are uniformly and diffusely distributed in beta grains and have average long axis sizes of 135nm and short axis sizes of 50 nm.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1455MPa and the tensile strength is 1505MPa.
Comparative example 1:
Likewise, ti-5Al-5V-5Mo-3Cr-1Zr alloy bars are selected as raw materials, and the following heat treatment is carried out by sampling from the bars:
s1, heating the sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching the sample to room temperature.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, preserving heat for 5 hours, and then quenching the sample to room temperature.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 600 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1235MPa and the tensile strength is 1343MPa.
Comparative example 2:
Likewise, ti-5Al-5V-5Mo-3Cr-1Zr alloy bars are selected as raw materials, and the following heat treatment is carried out by sampling from the bars:
s1, heating the sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching the sample to room temperature.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, and carrying out water quenching to room temperature after heat preservation for 100 hours.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 600 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1233MPa and the tensile strength is 1324MPa.
Comparative example 3:
Likewise, ti-5Al-5V-5Mo-3Cr-1Zr alloy bars are selected as raw materials, and the following heat treatment is carried out by sampling from the bars:
s1, heating the sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching the sample to room temperature.
S2, heating the sample subjected to solution heat treatment to 300 ℃ for low-temperature aging heat treatment, preserving heat for 2 hours, and then quenching to room temperature.
And S3, heating the sample subjected to the low-temperature aging heat treatment to 520 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1240MPa and the tensile strength is 1320MPa.
Comparative example 4:
Likewise, ti-5Al-5V-5Mo-3Cr-1Zr alloy bars are selected as raw materials, and the following heat treatment is carried out by sampling from the bars:
s1, heating the sample to 820 ℃ for solution heat treatment, preserving heat for 0.5 hour, and then quenching the sample to room temperature.
S2, directly heating the sample subjected to solution heat treatment to 600 ℃ for high-temperature aging heat treatment, preserving heat for 2 hours, and then quenching the sample to room temperature.
The heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air; the heating modes of the heat treatment are all to-temperature discharging; the metastable beta titanium alloy sample is cleaned to remove greasy dirt before heat treatment, and is cut, turned or polished to remove surface oxide skin after heat treatment.
According to GB/T228.1-2010 section 1 of tensile test of Metal Material: the room temperature test method tests the mechanical property of the metastable beta titanium alloy sample in the heat treatment state, and the yield strength is 1149MPa and the tensile strength is 1243MPa.
In comparison with examples 1-4, although metastable beta titanium alloys of the same composition were used and subjected to the same solid solution and low temperature aging treatment, the high temperature aging temperature in comparative examples 1-2 exceeded the temperature range (500-550 ℃) protected by the present patent application, resulting in lower yield strength (less than 1250 MPa). In addition, when the low temperature aging time is less than 5 hours (as in comparative example 3) and the solution treatment is directly followed by the high temperature aging treatment at 600 ℃ (as in comparative example 4), it is also caused to exhibit a lower yield strength (less than 1250 MPa).
It should be noted that in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A heat treatment method for improving the strength of metastable beta titanium alloy to more than 1400MPa, which is characterized in that the metastable beta titanium alloy material is a Ti-5Al-5V-5Mo-3Cr-1Zr alloy, and the method comprises the following steps:
Step 1, heating a metastable beta titanium alloy material to a temperature 10-30 ℃ below a beta transformation point, carrying out solution heat treatment, and then quenching the metastable beta titanium alloy material to room temperature;
In the microstructure of the metastable beta titanium alloy material after the solution heat treatment and water quenching in the step 1, the average size of beta grains is 75-85 mu m, the average size of primary alpha phase is 2.1-3.6 mu m, and the content of primary alpha phase is 1.4-2.5%;
step 2, heating the metastable beta titanium alloy material subjected to solution heat treatment to 300 ℃, preserving heat for 100 hours, performing low-temperature aging heat treatment, and then performing water quenching to room temperature;
The isothermal omega phase with the average size of more than 5nm, which is uniformly dispersed and distributed in beta grains, is obtained after the low-temperature aging heat treatment and water quenching in the step 2;
Step 3, heating the metastable beta titanium alloy material subjected to the low-temperature aging heat treatment to 500-550 ℃, performing high-temperature aging heat treatment, and then quenching the metastable beta titanium alloy material to room temperature;
And (3) performing high-temperature aging heat treatment and water quenching in the step (3) to obtain needle-shaped secondary alpha phase which is uniformly dispersed and distributed in beta grains, wherein the average long axis size is less than 140nm, and the short axis size is less than 55 nm.
2. The heat treatment method for increasing the strength of a metastable beta titanium alloy to 1400MPa or more according to claim 1, wherein: the heat preservation time of the solution heat treatment is more than or equal to 0.5 hour.
3. The heat treatment method for increasing the strength of a metastable beta titanium alloy to 1400MPa or more according to claim 1, wherein: the heat preservation time of the high-temperature aging heat treatment is 2 hours.
4. The heat treatment method for increasing the strength of a metastable beta titanium alloy to 1400MPa or more according to claim 1, wherein: the heat treatment is carried out in a resistance furnace, and the atmosphere is vacuum or air.
5. The heat treatment method for increasing the strength of a metastable beta titanium alloy to 1400MPa or more according to claim 1, wherein: the heating modes of the heat treatment are Wen Zhuangliao.
6. The heat treatment method for increasing the strength of a metastable beta titanium alloy to 1400MPa or more according to claim 1, wherein: the metastable beta titanium alloy material needs to be cleaned and degreased before heat treatment, and needs to be cleaned of surface oxide skin after heat treatment.
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| CN104726746A (en) * | 2015-04-17 | 2015-06-24 | 西北有色金属研究院 | High-strength metastable beta-type titanium alloy bar and production method thereof |
| CN110923598A (en) * | 2019-12-05 | 2020-03-27 | 中国航发北京航空材料研究院 | Heat treatment process for improving toughness of nearly β type or metastable β type titanium alloy |
| CN111270102A (en) * | 2020-03-25 | 2020-06-12 | 中国航空制造技术研究院 | Near β ultrahigh-strength titanium alloy with tensile strength of more than 1450MPa and preparation method thereof |
| CN112410697A (en) * | 2020-10-23 | 2021-02-26 | 北京航空航天大学 | High-strength and high-toughness titanium alloy heat treatment method based on nano domain |
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| CN104726746A (en) * | 2015-04-17 | 2015-06-24 | 西北有色金属研究院 | High-strength metastable beta-type titanium alloy bar and production method thereof |
| CN110923598A (en) * | 2019-12-05 | 2020-03-27 | 中国航发北京航空材料研究院 | Heat treatment process for improving toughness of nearly β type or metastable β type titanium alloy |
| CN111270102A (en) * | 2020-03-25 | 2020-06-12 | 中国航空制造技术研究院 | Near β ultrahigh-strength titanium alloy with tensile strength of more than 1450MPa and preparation method thereof |
| CN112410697A (en) * | 2020-10-23 | 2021-02-26 | 北京航空航天大学 | High-strength and high-toughness titanium alloy heat treatment method based on nano domain |
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| Effect of Heat Treatment Procedure on Mechanical Properties of Ti-15V-3Al-3Sn-3Cr Metastable b Titanium Alloy;Nihal Yumak等;《Journal of Materials Engineering and Performance》;第30卷(第2期);1066-1074 * |
| The effect of precursory a and u phase on microstructure evolution and tensile properties of metastable b titanium alloy;Ruixue Zhang等;《Journal of Materials Research and Technology》;第16卷;912-921 * |
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