CN114836702B - Heat treatment process for improving performance stability of TC25G alloy forging with thick section or variable section - Google Patents
Heat treatment process for improving performance stability of TC25G alloy forging with thick section or variable section Download PDFInfo
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- CN114836702B CN114836702B CN202210561044.6A CN202210561044A CN114836702B CN 114836702 B CN114836702 B CN 114836702B CN 202210561044 A CN202210561044 A CN 202210561044A CN 114836702 B CN114836702 B CN 114836702B
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a heat treatment process for improving performance stability of a TC25G alloy forging with a thick section or a variable section, which is characterized in that the TC25G alloy forging is heated to 25-35 ℃ below a beta transition temperature, is insulated for 1-3 hours and then is discharged for oil cooling, then the forging is heated to 870-890 ℃ for heat penetration, is insulated for 8-16 hours, is discharged for air cooling, and finally is heated to 530-570 ℃ for heat penetration, is insulated for 6-10 hours and is discharged for air cooling. When the maximum thickness of the forging is not more than 180mm, the difference between the maximum value and the minimum value of the room temperature tensile strength at any position is not more than 80MPa; when the maximum thickness of the forging piece is not more than 90mm, the difference between the maximum value and the minimum value of the room temperature tensile strength at any position is not more than 50MPa.
Description
Technical Field
The invention belongs to the technical field of titanium alloy, and particularly relates to a heat treatment process for improving performance stability of a TC25G alloy forging with a thick section or a variable section.
Background
The titanium alloy has the characteristics of low density, high strength, corrosion resistance and the like, and is widely applied to the fields of aviation, aerospace, navigation, chemical industry and the like. The large-size titanium alloy structural member requires that the material has good uniformity of structure and mechanical property, so that the material selection and the material processing technology are high.
The TC25G alloy is an alpha+beta-state alloy which is developed by adding Mo and Zr elements on the basis of Russian BT25 alloy, has the characteristics of high temperature resistance, high strength and high toughness, can be used for a long time at the service temperature of 550 ℃, and is mainly applied to a high-pressure compressor blisk of an aeroengine. However, due to the problem of hardenability, when the TC25G alloy forging is a thick-section forging or a variable-section forging, the surface cooling speed and the center cooling speed are different in the quenching process, so that the surface and the center of the forging have tissue difference, and the performance of different positions of the forging is caused. Therefore, a new heat treatment system needs to be designed to ensure the balance of the mechanical properties of the forging at different positions, improve the reliability and prolong the service life of the forging.
Disclosure of Invention
The invention provides a heat treatment process for improving the performance stability of a thick-section or variable-section TC25G alloy forging, which aims to solve the problems that the performance difference of different parts of the thick-section or variable-section TC25G alloy large-specification forging is increased, the strength of the center position of the forging is lower, and the like, and combines the characteristics of TC25G alloy components, the design of phase transformation and lath alpha phase grain growth rule, and the specific technical scheme is as follows:
a heat treatment process for improving performance stability of a TC25G forging with a thick or variable cross section comprises the following steps:
step 1), carrying out solution treatment on a TC25G alloy forging at a temperature of 15-25 ℃ below the beta transformation temperature, and cooling oil after discharging;
step 2), the forging is subjected to heat penetration at 870-910 ℃ and then heat preservation for 2-5 hours for air cooling;
and 3) finally, heat-insulating the forge piece at 530-630 ℃ for 6-8 hours after heat penetration, and then air-cooling.
The heat treatment process for improving the performance stability of the TC25G forging with the thick section or the variable section is characterized by comprising the following steps of: the forging of the TC25G alloy is a two-phase region hot working forging, and the maximum thickness of the forging is not more than 180mm.
According to the heat treatment process for improving the performance stability of the TC25G alloy forging with the thick section or the variable section, the TC25G alloy forging is a two-phase region heat-processed forging, and when the maximum thickness of the forging is not more than 180mm, the difference between the maximum value and the minimum value of the room-temperature tensile strength of any position of the forging is not more than 80MPa; when the maximum thickness of the forging is not more than 90mm, the difference between the maximum value and the minimum value of the room temperature tensile strength of any position of the forging is not more than 50MPa.
The heat treatment process for improving the performance stability of the TC25G alloy forging with the thick section or the variable section comprises the following components in a preferable scheme: al:6.0 to 7.0; mo:3.5 to 4.5; zr:3.0 to 4.5; sn:1.0 to 2.5; w:0.4 to 1.5; si:0.1 to 0.3, and the balance of Ti and unavoidable impurity elements.
The invention has the beneficial effects that:
the invention is beneficial to reducing the tissue difference of different positions of a large-size thick-section or variable-section TC25G titanium alloy forging, when the thickness of the forging is not more than 180mm, the room temperature tensile strength difference of any position of the forging is not more than 80MPa, and compared with the forging under the traditional heat treatment process, the performance stability and consistency of the forging are obviously improved; when the maximum thickness of the forging is not more than 90mm, the difference between the maximum value and the minimum value of the room temperature tensile strength of any position of the forging is not more than 50MPa. The invention is described in further detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic cross-sectional view of a forging of embodiment 1 of the present invention;
FIG. 2 is a photograph of the surface microstructure of a forging heat treated in accordance with example 1 of the present invention;
FIG. 3 is a photograph of the center microstructure of a forging of example 1 of the present invention after heat treatment;
FIG. 4 is a schematic cross-sectional view of a forging of example 2 of the present invention;
FIG. 5 is a photograph of the surface microstructure of a forging heat treated in accordance with example 2 of the present invention;
FIG. 6 is a photograph of the center microstructure of a forging of example 2 of the present invention after heat treatment;
FIG. 7 is a schematic cross-sectional view of a forging of example 3 of the present invention;
FIG. 8 is a photograph of the microstructure of the center of a hub after heat treatment of a forging in accordance with example 2 of the present invention;
FIG. 9 is a photograph of the center microstructure of the web after heat treatment of the forging of example 2 of the present invention;
FIG. 10 is a photograph of the microstructure of the center of the rim after heat treatment of the forging of example 2 of the present invention.
Detailed Description
Example 1:
the material used in the embodiment is TC25G alloy disk forgings with the specification of 900mm diameter and 180mm thickness, the components of the alloy disk forgings are Ti-6.37Al-1.80Zr-4.12Mo-0.24Si-0.78W, the balance is Ti and unavoidable impurity elements, and the alloy phase transition point is 985 ℃ detected by a metallographic method;
1) Firstly heating a TC25G alloy forging to 965 ℃, preserving heat for 2 hours, and discharging oil for cooling;
2) Preserving heat of the forging obtained in the step 1) for 4 hours at 890 ℃ under the condition 0, and then discharging and air cooling;
3) And finally, preserving the heat of the forging piece obtained in the step 2) for 6 hours at the temperature of 540 ℃, and then discharging and air cooling.
The analysis result of the structure of the forging after heat treatment shows that the microstructure of the forging is a bimodal structure, the content of primary alpha is about 20%, and the rest is a beta transformation structure. There was no significant difference in microstructure between the forging surface and center. And (3) testing room-temperature tensile properties of the forging, and comparing the test result with the forging under the traditional heat treatment process, wherein the highest strength value is 1148MPa on the surface of the forging, the lowest strength value is 1098MPa in the center of the forging, and the difference between the highest strength value and the lowest strength value is 50MPa. And the room temperature tensile strength difference of the forging under the traditional heat treatment process exceeds 100MPa, so that the new heat treatment process can obviously reduce the room temperature tensile strength difference of different positions of the forging, and the consistency of the structure and the performance is improved.
Table 1 example 1 forging room temperature tensile properties
Example 2:
the materials used in the embodiment are disc forgings with the diameter of 850mm and the thickness of 90mm, the alloy components are Ti-6.39Al-1.80Zr-3.98Mo-0.19Si-0.81W, and the balance is unavoidable impurity elements, and the alloy phase transition point is 983 ℃ detected by a metallographic method;
1) Firstly heating a TC25G alloy forging to 960 ℃, preserving heat for 2 hours, and discharging oil for cooling;
2) Preserving heat of the forging obtained in the step 1) for 4 hours at 890 ℃, and then discharging and air cooling;
3) And finally, preserving the heat of the forging piece obtained in the step 2) for 6 hours at the temperature of 540 ℃, and then discharging and air cooling.
The heat-treated structure of the forging is a typical bimodal structure, the primary alpha content is about 20%, and the rest is a beta transformation structure. The surface and the center structure of the forging are similar, and no obvious difference exists. The room temperature tensile property test results (Table 2) show that the highest strength value of the forging is 1151MPa, the lowest strength value of the forging is 1118MPa, the difference is 33MPa, and the room temperature tensile property difference of the compared forging after the forging is subjected to heat treatment by the traditional process is 100MPa, so that the whole performance stability of the forging can be remarkably improved by the novel heat treatment process.
Table 2 room temperature tensile properties of example 2 forgings
Example 3:
the materials used in the embodiment are TC25G alloy disc forgings with different thicknesses at different positions and diameters of 950 mm; the thicknesses at different positions are as follows: the hub is 70mm, the web is 40mm, and the rim is 110mm; the TC25G alloy disk forging comprises the components of Ti-6.42Al-1.83Zr-4.06Mo-0.21Si-0.79W, and the balance of Ti and unavoidable impurity elements, wherein the alloy phase transition point is 988 ℃ detected by a metallographic method;
1) Firstly heating a TC25G alloy forging to 968 ℃, preserving heat for 2 hours, and discharging oil for cooling;
2) Preserving heat of the forging obtained in the step 1) for 4 hours at 895 ℃, and then discharging and air cooling;
3) And finally, preserving the heat of the forging piece obtained in the step 2) for 6 hours at the temperature of 540 ℃, and then discharging and air cooling.
The structure of the forging after heat treatment is a two-state structure, the content of primary alpha is about 20%, and the rest is a beta transformation structure. The forging hub, the web and the rim are similar in structure and high in structure consistency. The tensile property test results at room temperature (Table 3) show that the strength of the forging is 1151MPa at the highest value, 1102MPa at the lowest value, and the difference between the properties of the forging under the traditional process is 87MPa, so that the overall performance consistency of the forging in the embodiment is far higher than that of the forging under the traditional heat treatment process.
Table 3 example 3 room temperature tensile properties of forgings
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (3)
1. A heat treatment process for improving performance stability of a TC25G alloy forging with a thick section or a variable section is characterized by comprising the following steps:
step 1), carrying out solution treatment on a TC25G alloy forging at a temperature of 15-25 ℃ below the beta transformation temperature, and cooling oil after discharging;
step 2), the forging is subjected to heat penetration at 870-910 ℃ and then heat preservation for 2-5 hours for air cooling;
and 3) finally, preserving heat for 6-8 hours after the forge piece is heated to 530-630 ℃ for air cooling.
2. The heat treatment process for improving the performance stability of a thick-section or variable-section TC25G alloy forging according to claim 1, wherein the heat treatment process comprises the following steps of: the TC25G alloy forging is a two-phase region hot-working forging, and when the maximum thickness of the forging is not more than 180mm, the difference between the maximum value and the minimum value of the room-temperature tensile strength of any position of the forging is not more than 80MPa; when the maximum thickness of the forging piece is not more than 90 mm; the maximum and minimum values of tensile strength of the forge piece at room temperature are not more than 50MPa.
3. The heat treatment process for improving the performance stability of a thick-section or variable-section TC25G alloy forging according to claim 1, wherein the heat treatment process comprises the following steps of: the TC25G alloy forging comprises the following components: al:6.0 to 7.0; mo:3.5 to 4.5; zr:3.0 to 4.5; sn:1.0 to 2.5; w:0.4 to 1.5; si:0.1 to 0.3, and the balance of Ti and unavoidable impurity elements.
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Citations (6)
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|---|---|---|---|---|
| DE2255313A1 (en) * | 1971-11-22 | 1973-05-24 | United Aircraft Corp | PROCESS FOR THE PRODUCTION OF HIGH STRENGTH ALPHA / BETA TITANIUM ALLOYS |
| CN1032962A (en) * | 1987-11-01 | 1989-05-17 | 西北工业大学 | Technology of equiaxial miniaturization of crystal microstructure of alpha+beta titanium alloys |
| EP0716155A1 (en) * | 1994-12-05 | 1996-06-12 | Nkk Corporation | Method for making an alpha-beta titanum alloy |
| CN106854742A (en) * | 2016-12-29 | 2017-06-16 | 西部超导材料科技股份有限公司 | The preparation method of silk material is justified in a kind of cold-heading with TC16 alloy discs |
| CN108165820A (en) * | 2016-12-08 | 2018-06-15 | 北京有色金属研究总院 | A kind of strong heat-resistant titanium alloy of superelevation and sheet alloy and preparation method in short-term |
| CN112760581A (en) * | 2020-12-19 | 2021-05-07 | 北京工业大学 | Forging-rolling composite processing and heat treatment process of near-alpha type high-temperature titanium alloy |
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2022
- 2022-05-23 CN CN202210561044.6A patent/CN114836702B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2255313A1 (en) * | 1971-11-22 | 1973-05-24 | United Aircraft Corp | PROCESS FOR THE PRODUCTION OF HIGH STRENGTH ALPHA / BETA TITANIUM ALLOYS |
| CN1032962A (en) * | 1987-11-01 | 1989-05-17 | 西北工业大学 | Technology of equiaxial miniaturization of crystal microstructure of alpha+beta titanium alloys |
| EP0716155A1 (en) * | 1994-12-05 | 1996-06-12 | Nkk Corporation | Method for making an alpha-beta titanum alloy |
| CN108165820A (en) * | 2016-12-08 | 2018-06-15 | 北京有色金属研究总院 | A kind of strong heat-resistant titanium alloy of superelevation and sheet alloy and preparation method in short-term |
| CN106854742A (en) * | 2016-12-29 | 2017-06-16 | 西部超导材料科技股份有限公司 | The preparation method of silk material is justified in a kind of cold-heading with TC16 alloy discs |
| CN112760581A (en) * | 2020-12-19 | 2021-05-07 | 北京工业大学 | Forging-rolling composite processing and heat treatment process of near-alpha type high-temperature titanium alloy |
Non-Patent Citations (2)
| Title |
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