CN115821111A - Short-time high-temperature resistant titanium alloy and forging method thereof - Google Patents
Short-time high-temperature resistant titanium alloy and forging method thereof Download PDFInfo
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- CN115821111A CN115821111A CN202211279228.XA CN202211279228A CN115821111A CN 115821111 A CN115821111 A CN 115821111A CN 202211279228 A CN202211279228 A CN 202211279228A CN 115821111 A CN115821111 A CN 115821111A
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- 238000005242 forging Methods 0.000 title claims abstract description 51
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 230000032683 aging Effects 0.000 claims abstract description 8
- 239000010936 titanium Substances 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 4
- 229910052718 tin Inorganic materials 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 3
- 229910021332 silicide Inorganic materials 0.000 claims description 3
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 241000543381 Cliftonia monophylla Species 0.000 claims 1
- 239000013078 crystal Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229910009871 Ti5Si3 Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention belongs to the field of scientific and technical processing of metal materials, and relates to a short-time and high-temperature resistant titanium alloy and a forging method thereof. The invention comprises the following chemical components in percentage by weight: 6.8 to 7.7 percent of Al, 3.8 to 4.5 percent of Sn, 0.3 to 0.6 percent of Mo, 1.8 to 4.2 percent of Zr, 0.1 to 0.5 percent of Si, 0.7 to 1.3 percent of Ta, 0.3 to 0.8 percent of Nb and the balance of Ti; the ingot or the blank is upset and drawn for a plurality of times to be deformed into a bar, and then solution and aging heat treatment is carried out, so that the alloy has excellent high-temperature mechanical property and fracture toughness.
Description
Technical Field
The invention belongs to the field of scientific and technical processing of metal materials, and relates to a short-time and high-temperature resistant titanium alloy and a forging method thereof.
Background
The high temperature parts of the engine and the engine body of the new generation of aerospace plane are required to reach 650-700 ℃ in a short time, and if the surface temperature of the aircraft with the Mach number of 6 reaches above 650 ℃, the titanium alloy material is required to bear the short-time high-temperature load action above 650 ℃, and meanwhile, the titanium alloy material is also ensured to have enough high-temperature fracture toughness to ensure the long-life flight safety of the aircraft. Therefore, the development and development of the short-time high-temperature resistant titanium alloy can meet the requirement of part of special key components of a novel high-speed aircraft on a new material resistant to the temperature of more than 650 ℃, and has important strategic significance and military value.
The short-time high-temperature resistant titanium alloy generally requires the working temperature to be above 650-700 ℃, the working time is generally between dozens of minutes and hours, and the titanium alloy has excellent high-temperature fracture resistance. At present, research and development of short-time high-temperature titanium alloy mainly absorbs research and development technical experience, advanced processing and manufacturing technology and engineering application technology of high-temperature titanium alloy in the aviation field for reference, and makes great progress.
Disclosure of Invention
The invention aims to provide a short-time high-temperature resistant titanium alloy and a forging method thereof, which meet the requirement of special key parts of a novel high-speed aircraft on a new material resistant to the temperature of more than 650 ℃.
Therefore, the technical scheme adopted by the invention is as follows:
the short-time high-temperature resistant titanium alloy comprises the following chemical components in percentage by weight: 6.8 to 7.7 percent of Al, 3.8 to 4.5 percent of Sn, 0.3 to 0.6 percent of Mo, 1.8 to 4.2 percent of Zr, 0.1 to 0.5 percent of Si, 0.7 to 1.3 percent of Ta, 0.3 to 0.8 percent of Nb and the balance of Ti.
The forging method of the short-time high-temperature resistant titanium alloy comprises the following steps:
step 1, after the ingot is kept at 1156 ℃ for 3-8 hours, 2-upsetting and 2-pulling deformation are carried out on a quick forging machine, wherein the deformation amount is 45.5%;
step 2, after the blank is subjected to heat preservation at 1090 ℃ for 3-8 hours, 1-upsetting and 1-drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
step 3, preserving the heat of the blank at 1060 ℃ for 3-8 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
step 4, after the blank is subjected to heat preservation at 990 ℃ for 3-8 hours, performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 33%;
step 5, preserving the heat of the blank at 1050 ℃ for 3-8 hours, and then performing 1 upsetting and 1 drawing deformation on a rapid forging machine, wherein the deformation amount is 44%;
step 6, preserving the heat of the blank at 980 ℃ for 3-8 hours, performing 2-3 times of 1 upsetting and 1 drawing deformation on a quick forging machine, wherein the deformation is 33%, and then drawing to obtain a finished bar;
step 7, performing 1013 ℃/2h, AC +, 700 ℃/8h and AC solution aging heat treatment on the bar;
the beta phase content percentage in the short-time high-temperature resistant titanium alloy room temperature microstructure is 5% -12%.
The silicide in the short-time high-temperature resistant titanium alloy room-temperature microstructure mainly takes Ti6Si3 and Ti5Si3 types, and the size is 80-200 nanometers.
The alpha 2 phase in the short-time high-temperature resistant titanium alloy room-temperature microstructure is uniformly dispersed in the alpha phase, and the size of the alpha phase is 5-150 nanometers.
The close temperature of the alpha 2 phase complete dissolution in the short-time high-temperature resistant titanium alloy room temperature microstructure is more than 700 ℃.
And (3) during forging deformation in the steps 1-6, a uniform downward pressing mode is adopted, and the deformation rate is 33mm/s.
The high-temperature fracture toughness of the short-time high-temperature resistant titanium alloy at the temperature of more than 650 ℃ reaches more than 45 MPa.m 1/2.
Compared with the prior art, the invention has the following advantages: the alloy system has corresponding element range, room temperature tensile strength over 1050MPa, high temperature tensile strength over 650MPa at 700 deg.c, high temperature tensile strength over 600MPa at 650 deg.c, and high temperature fracture toughness over 650 deg.c up to 45 MPa.m 1/2 The above. The alloy has low high-temperature performance reduction range, mainly because the alloy contains 6.8-7.7 percent of Al and 3.8-4.5 percent of Sn which are the basis of the order strengthening, particularly contains 0.1-0.5 percent of Si and 0.7-1.3 percent of Ta, fully ensures that the alloy contains enough nano-scale silicide (80-200 nanometers) and alpha 2 phase (5-150 nanometers), and the complete dissolution critical temperature of the alpha 2 phase is more than 700 ℃. In addition, 0.3 to 0.6 percent of Mo, 1.8 to 4.2 percent of Zr and 0.3 to 0.8 percent of Nb are added into the alloy,the beta phase in the structure is controlled in a proper range (5-12 percent), and the high-temperature fracture toughness of the alloy is ensured.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples:
example 1: ti-7.6Al-4.5Sn-0.52Mo-3.6Zr-0.35Si-1.1Ta-0.55Nb
Keeping the cast ingot at 1156 ℃ for 7 hours, and then carrying out 2-upsetting and 2-drawing deformation on a quick forging machine, wherein the deformation amount is 45.5%;
after the blank is kept at 1090 ℃ for 7 hours, 1-upsetting and 1-drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
keeping the blank at 1060 ℃ for 6 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
preserving the heat of the blank at 990 ℃ for 7 hours, and performing 1 upsetting and 1 drawing deformation on a rapid forging machine, wherein the deformation amount is 33%;
preserving the heat of the blank at 1050 ℃ for 6 hours, and performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44%;
after the blank is kept at 980 ℃ for 5 hours, 1 upsetting and 1 drawing deformation are carried out on the blank for 2 to 3 times on a quick forging machine, the deformation amount is 33 percent, and then the blank is drawn to a finished bar;
the bar is subjected to 1013 ℃/2h, AC +700 ℃/8h and AC solution aging heat treatment.
Through detection, the average value of the room-temperature tensile strength reaches 1078MPa, the average value of the 650 ℃ tensile strength reaches 659MPa, the average value of the 700 ℃ tensile strength reaches 600MPa, and the average value of the 650 ℃ fracture toughness reaches 48 MPa.m 1/2 。
Example 2: ti-7.4Al-4.3Sn-0.55Mo-4.1Zr-0.4Si-1.1Ta-0.7Nb
Keeping the cast ingot at 1156 ℃ for 7 hours, and then carrying out 2-upsetting and 2-drawing deformation on a quick forging machine, wherein the deformation amount is 45.5%;
after the blank is kept at 1090 ℃ for 7 hours, 1-upsetting and 1-drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
keeping the blank at 1060 ℃ for 7 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
preserving the heat of the blank at 990 ℃ for 6 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 33%;
keeping the blank at 1050 ℃ for 7 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44%;
after the blank is kept at 980 ℃ for 5 hours, 1 upsetting and 1 drawing deformation are carried out on the blank for 2 to 3 times on a quick forging machine, the deformation amount is 33 percent, and then the blank is drawn to a finished bar;
the bar is subjected to 1013 ℃/2h, AC +, 700 ℃/8h and AC solution aging heat treatment.
Through detection, the average value of the room-temperature tensile strength reaches 1080MPa, the average value of the tensile strength reaches 667MPa at 650 ℃, the average value of the tensile strength reaches 603MPa at 700 ℃, and the average value of the fracture toughness reaches 51 MPa.m at 650 DEG C 1/2 。
Example 3: ti-7.1Al-3.9Sn-0.5Mo-3.2Zr-0.25Si-0.9Ta-0.6Nb
After the cast ingot is kept at 1156 ℃ for 8 hours, 2-upsetting and 2-drawing deformation are carried out on the cast ingot on a quick forging machine, wherein the deformation amount is 45.5%;
after the blank is subjected to heat preservation at 1090 ℃ for 8 hours, 1 upsetting and 1 drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
keeping the blank at 1060 ℃ for 8 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
after the blank is subjected to heat preservation for 7 hours at 990 ℃, 1 upsetting and 1 drawing deformation are carried out on a quick forging machine, wherein the deformation amount is 33%;
preserving the heat of the blank at 1050 ℃ for 8 hours, and then performing 1 upsetting and 1 drawing deformation on a rapid forging machine, wherein the deformation amount is 44%;
after the blank is kept at 980 ℃ for 6 hours, 1 upsetting and 1 drawing deformation are carried out on the blank on a rapid forging machine for 2 to 3 times, the deformation amount is 33 percent, and then the blank is drawn to a finished bar;
the bar is subjected to 1013 ℃/2h, AC +, 700 ℃/8h and AC solution aging heat treatment.
The detection shows that the average value of the room-temperature tensile strength reaches 1080MPa, the average value of the tensile strength reaches 680MPa at 650 ℃, the average value of the tensile strength reaches 621MPa at 700 ℃, and the average value of the fracture toughness reaches 53 MPa.m at 650 DEG 1/2 。
Example 4: ti-7.5Al-4.4Sn-0.45Mo-3.8Zr-0.35Si-0.95Ta-0.5Nb
Keeping the cast ingot at 1156 ℃ for 5 hours, and then carrying out 2-upsetting and 2-drawing deformation on a quick forging machine, wherein the deformation amount is 45.5%;
keeping the blank at 1090 ℃ for 5 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44.5%;
keeping the blank at 1060 ℃ for 5 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
preserving the heat of the blank at 990 ℃ for 4.5 hours, and then performing 1 upsetting and 1 drawing deformation on a rapid forging machine, wherein the deformation amount is 33%;
keeping the blank at 1050 ℃ for 4 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44%;
after the blank is kept at 980 ℃ for 3 hours, performing 1 upsetting and 1 drawing deformation on the blank by 2-3 times of heating on a quick forging machine, wherein the deformation is 33 percent, and then drawing the blank to obtain a finished bar;
the bar is subjected to 1013 ℃/2h, AC +, 700 ℃/8h and AC solution aging heat treatment.
The test shows that the average value of the room-temperature tensile strength reaches 1095MPa, the average value of the tensile strength at 650 ℃ reaches 742MPa, the average value of the tensile strength at 700 ℃ reaches 703MPa, and the average value of the fracture toughness at 650 ℃ reaches 55 MPa.m 1/2 。
Example 5: ti-6.9Al-4.1Sn-0.4Mo-1.9Zr-0.2Si-0.8Ta-0.4Nb
Keeping the cast ingot at 1156 ℃ for 8 hours, and then carrying out 2-upsetting and 2-drawing deformation on a quick forging machine, wherein the deformation amount is 45.5%;
after the blank is kept at 1090 ℃ for 8 hours, 1 upsetting and 1 drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
keeping the blank at 1060 ℃ for 8 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
preserving the heat of the blank at 990 ℃ for 6 hours, and performing 1 upsetting and 1 drawing deformation on a rapid forging machine, wherein the deformation amount is 33%;
preserving the heat of the blank at 1050 ℃ for 6 hours, and performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44%;
after the blank is kept at 980 ℃ for 5 hours, 1 upsetting and 1 drawing deformation are carried out on the blank for 2 to 3 times on a quick forging machine, the deformation amount is 33 percent, and then the blank is drawn to a finished bar;
the bar is subjected to 1013 ℃/2h, AC +, 700 ℃/8h and AC solution aging heat treatment.
Through detection, the average value of the room-temperature tensile strength reaches 1071MPa, the average value of the tensile strength at 650 ℃ reaches 755MPa, the average value of the tensile strength at 700 ℃ reaches 628MPa, and the average value of the fracture toughness at 650 ℃ reaches 47 MPa.m 1/2 。
Claims (8)
1. The short-time high-temperature resistant titanium alloy is characterized by comprising the following chemical components in percentage by weight: 6.8 to 7.7 percent of Al, 3.8 to 4.5 percent of Sn, 0.3 to 0.6 percent of Mo, 1.8 to 4.2 percent of Zr, 0.1 to 0.5 percent of Si, 0.7 to 1.3 percent of Ta, 0.3 to 0.8 percent of Nb and the balance of Ti.
2. The forging method of the short-time high-temperature resistant titanium alloy according to claim 1, comprising the steps of:
step 1, after the ingot is kept at 1156 ℃ for 3-8 hours, 2-upsetting and 2-pulling deformation are carried out on a quick forging machine, wherein the deformation amount is 45.5%;
step 2, after the blank is subjected to heat preservation at 1090 ℃ for 3-8 hours, 1-upsetting and 1-drawing deformation are carried out on a quick forging machine, and the deformation amount is 44.5%;
step 3, preserving the heat of the blank at 1060 ℃ for 3-8 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 43%;
step 4, after the blank is subjected to heat preservation at 990 ℃ for 3-8 hours, performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 33%;
step 5, preserving the heat of the blank at 1050 ℃ for 3-8 hours, and then performing 1-upsetting and 1-drawing deformation on a quick forging machine, wherein the deformation amount is 44%;
step 6, preserving the heat of the blank at 980 ℃ for 3-8 hours, performing 2-3 times of 1 upsetting and 1 drawing deformation on a quick forging machine, wherein the deformation is 33%, and then drawing to obtain a finished bar;
step 7, 1013 ℃/2h, AC +700 ℃/8h and AC solution aging heat treatment are carried out on the bar;
3. the short-time high-temperature resistant titanium alloy according to claim 1, wherein the short-time high-temperature resistant titanium alloy has a beta phase content percentage of 5-12% in a room-temperature microstructure.
4. The alloy of claim 1, wherein the TiTi alloy has room temperature silicide formed by Ti 6 Si 3 And Ti 5 Si 3 Mainly takes the form of a crystal with the size of 80-200 nanometers.
5. The short-time high-temperature resistant titanium alloy according to claim 1, wherein an alpha 2 phase in a room-temperature microstructure of the short-time high-temperature resistant titanium alloy is uniformly dispersed and distributed in the alpha phase, and the size of the alpha phase is 5-150 nm.
6. The short-term high-temperature resistant titanium alloy as claimed in claim 1, wherein the close proximity temperature of complete dissolution of the α 2 phase in the room temperature microstructure of the short-term high-temperature resistant titanium alloy is greater than 700 ℃.
7. The short-time high-temperature resistant titanium alloy according to claim 2, wherein the forging deformation in the steps 1-6 is performed in a constant-speed pressing mode, and the deformation rate is 33mm/s.
8. The short time high temperature resistant titanium alloy of claim 2, wherein the high temperature fracture toughness of the short time high temperature resistant titanium alloy above 650 ℃ is 45 MPa-m 1/2 As described above.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09165634A (en) * | 1995-12-15 | 1997-06-24 | Sumitomo Metal Ind Ltd | Heat resistant titanium alloy |
| CN106636746A (en) * | 2016-12-28 | 2017-05-10 | 北京工业大学 | High-strength and high-elongation high-temperature titanium alloy and preparing technology thereof |
| CN110923589A (en) * | 2019-11-26 | 2020-03-27 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy Ti-101AM for 700-750 DEG C |
| CN111014651A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy powder for 700-750 ℃ and preparation thereof |
| CN111020414A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C |
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- 2022-10-19 CN CN202211279228.XA patent/CN115821111B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09165634A (en) * | 1995-12-15 | 1997-06-24 | Sumitomo Metal Ind Ltd | Heat resistant titanium alloy |
| CN106636746A (en) * | 2016-12-28 | 2017-05-10 | 北京工业大学 | High-strength and high-elongation high-temperature titanium alloy and preparing technology thereof |
| CN110923589A (en) * | 2019-11-26 | 2020-03-27 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy Ti-101AM for 700-750 DEG C |
| CN111014651A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Short fiber reinforced high-temperature titanium alloy powder for 700-750 ℃ and preparation thereof |
| CN111020414A (en) * | 2019-11-26 | 2020-04-17 | 中国科学院金属研究所 | Preparation method of short fiber reinforced high-temperature titanium alloy bar for 700-750 DEG C |
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