CN108374136A - A kind of heat treatment method improving TC4 titanium alloys intensity and plasticity - Google Patents
A kind of heat treatment method improving TC4 titanium alloys intensity and plasticity Download PDFInfo
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- CN108374136A CN108374136A CN201810521142.0A CN201810521142A CN108374136A CN 108374136 A CN108374136 A CN 108374136A CN 201810521142 A CN201810521142 A CN 201810521142A CN 108374136 A CN108374136 A CN 108374136A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 abstract description 18
- 239000000956 alloy Substances 0.000 abstract description 16
- 229910045601 alloy Inorganic materials 0.000 abstract description 14
- 238000001556 precipitation Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000010899 nucleation Methods 0.000 abstract description 2
- 230000006911 nucleation Effects 0.000 abstract description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 33
- 238000012360 testing method Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000000930 thermomechanical effect 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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- Organic Chemistry (AREA)
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Abstract
The invention discloses a kind of heat treatment methods improving TC4 titanium alloys intensity and plasticity, are as follows：40 50 DEG C of heat preservations below (alpha+beta)/beta transus temperature by TC4 titanium alloys, water cooling is to room temperature after quick tapping, then 3% 7% cold stretch plastic deformation is carried out, the TC4 titanium alloys after being finally plastically deformed cold stretch are air-cooled to room temperature after 450 500 DEG C of 3 4h of ageing treatment come out of the stove.The principle of heat treatment method provided by the present invention is that the defects of dislocation by retaining during cold deformation provides more equiax crystals for the precipitation of secondaryαphase in ag(e)ing process, improve the nucleation rate of secondaryαphase, promote the precipitation of secondaryαphase in ag(e)ing process so that alloy structure is tiny and is uniformly distributed；Compared with the heat treatment process of conventional solid solution+timeliness, solid solution+cold deformation+ageing strengthening technique of the present invention is more advantageous to the intensity for improving TC4 titanium alloys, while keeping very high plasticity.In addition, the present invention heat treatment method also have many advantages, such as it is simple for process and easily operated.
Description
Technical field
The present invention relates to the heat treatment process of titanium alloy material, more particularly to a kind of raising TC4 titanium alloys intensity and plasticity
Heat treatment method.
Background technology
TC4 (Ti-6Al-4V) titanium alloy of alpha+beta type is the earliest titanium alloy material developed and be successfully applied, and
Titanium alloy most widely used so far, the specific strength of the alloy is high, high temperature resistance and resistance to low temperature are good and be not easy
It is corroded, therefore in the fields quilt such as aerospace, exploration of ocean resources and exploitation, medical implant and oilfield drilling equipment
It is widely used.
But since TC4 titanium alloy intensity belongs to medium, plasticity and toughness are relatively low, therefore cannot still meet it is certain in special circumstances
The performance requirement of component.TC4 titanium alloys are strengthened frequently with the heat treatment process of solid solution+timeliness at present, TC4 titanium alloys warp
Cross after normative heat treatment strengthens, tensile strength can reach 1015-1170MPa, however this strength range still cannot meet it is certain
The performance requirement of high strength structure part, therefore, relevant technical worker develop thermomechanical aging technique (i.e. at high temperature deformation heat
Reason) TC4 titanium alloys are strengthened, it is intended to by secondary α in promotion ag(e)ing process the defects of the dislocation generated in deformation process
The precipitation of phase, to improve the intensity of titanium alloy.But since the deformation stage in high-temperature particles will be in very high temperature
Degree is lower to carry out, and dynamic recovery and dynamic recrystallization can occur in deformation process, this can make the dislocation generated in deformation process
Equal crystal defects, which greatly reduce, even to disappear, and the defect that room temperature can be remained into after cooling is also seldom, to promoting in follow-up ag(e)ing process
Effect into Second Phase Precipitation is not notable, can not greatly improve the mechanical property of alloy in this way.In addition to heat treatment reinforcement, may be used also
The intensity of TC4 titanium alloys is improved by way of large plastometric set and alloying, but these methods are strong in raising alloy
While spending, low-alloyed plasticity can drop to some extent, and it is very poor so as to cause the toughness of alloy, still it cannot meet high tough
The performance requirement of titanium alloy structure part.
Therefore, in order to obtain the TC4 titanium alloys of higher intensity, and the plasticity and toughness for keeping its excellent, enable its safety
It is improved, application field can be widened, and a kind of heat treatment method right and wrong improving TC4 titanium alloys intensity and plasticity are developed
Often it is necessary to.
Invention content
Existing deficiency, the present invention propose a kind of raising TC4 in terms of strengthening TC4 titanium alloys for the above-mentioned prior art
The heat treatment method of titanium alloy intensity and plasticity.Realizing above-mentioned purpose, solution of the invention is：
A kind of heat treatment method improving TC4 titanium alloys intensity and plasticity, which is characterized in that specifically comprise the following steps：
(1) by TC4 titanium alloys below (alpha+beta)/beta transus temperature 40-50 DEG C heat preservation, soaking time by formula t=η ×
hmaxIt calculates, wherein η is heating coefficient, usually takes 0.25-0.7mm/min, hmaxFor the maximum effective thickness of part, unit is
The unit of mm, soaking time t are min；
It (2) will be by water cooling after the TC4 titanium alloy quick tappings after step (1) heat preservation to room temperature；
(3) cold plastic deformation of 3%-7% will be carried out by step (2) TC4 titanium alloys after cooling；
It (4) will be empty after 450-500 DEG C of ageing treatment 3-4h comes out of the stove by the TC4 titanium alloys after step (3) cold plastic deformation
It is cooled to room temperature.
Preferably, the cold plastic deformation is cold stretch, and the part needs to enter stove to temperature.
The principle of the present invention is as follows：
The present invention carries out TC4 titanium alloys by the way of solid solution+pre-cold working+timeliness (deformation and timeliness synergistic effect)
Strengthen, since cold deformation process carries out at room temperature, is not in dynamic recovery and dynamic recrystallization and change is lost
The defects of dislocation generated during shape, these defects retained can promote the precipitation of secondaryαphase in ag(e)ing process, improve secondary
The nucleation rate of raw α phases so that alloy obtains fine and uniformly distributed tissue, to obtain higher intensity and plasticity.
Compared to existing TC4 titanium alloys reinforcement process, the invention has the advantages that：
1. the present invention can increase substantially the yield strength, tensile strength and elongation percentage of TC4 titanium alloys；Consolidate with conventional
Molten+aging strengthening model is compared, and for TC4 titanium alloys after heat treatment process of the present invention reinforcing, yield strength and tension are strong
Degree can improve 50-120MPa or so, and elongation percentage can improve 3% or so.
2. the present invention can solve the contradiction that plasticity declines when alloy strength improves, to make alloy obtain high intensity and height
The Good All-around Property of toughness, the titanium alloy to produce high-strength and high ductility establish solid foundation.
3. the present invention's is of low cost：Equipment used by cold plastic deformation is common stretching-machine, is heat-treated used
Equipment is common heat-treatment furnace, simple for process and easily operated.
Description of the drawings
Fig. 1 be TC4 titanium alloys water cooling after 30min is kept the temperature at 940 DEG C, without cold deformation directly at 500 DEG C timeliness
Amplify 500 times of metallographic structure after 4h；
Fig. 2 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 3% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure after timeliness 4h；
Fig. 3 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 5% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure after timeliness 4h；
Fig. 4 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 7% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure after timeliness 4h；
Fig. 5 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, is existed respectively again after different distortion quantitative change shape
Intensity variation curve at 500 DEG C after timeliness 4h.
Fig. 6 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, is existed respectively again after different distortion quantitative change shape
Plasticity change curve at 500 DEG C after timeliness 4h.
Specific implementation mode
Further below in conjunction with the embodiments with attached drawing with the present invention will be described in detail.It will similarly be understood that following embodiment is only used
In invention is further explained, it should not be understood as limiting the scope of the invention, it is specific quality in example, anti-
Between seasonable and temperature, technological parameter etc. are also only an examples in OK range, and those skilled in the art is according to the present invention
Some nonessential modifications and adaptations for making of the above all belong to the scope of protection of the present invention.
The processing method of all parts is as follows：
(1) first by TC4 titanium alloys 940 DEG C (depending on the specific ingredient of alloy, be typically chosen (alpha+beta)/beta transus temperature with
Lower 40-50 DEG C of coexistence region is advisable) under keep the temperature, soaking time is calculated by formula t=η × hmax, and wherein η is heating coefficient, one
As take 0.25-0.7mm/min, hmax is the maximum effective thickness of part, and unit is：The unit of mm, soaking time t is：min；
It (2) will be by the titanium alloy quick tapping water cooling after step (1) heat preservation to room temperature；
(3) cold stretch that 3%-7% will be carried out by step (2) part after cooling is plastically deformed；
(4) it will come out of the stove after timeliness 3-4h at 450-500 DEG C by the alloy after step (3) cold deformation air-cooled.
Embodiment 1
Fig. 2 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 3% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure figure after timeliness 4h.With after solid solution without cold deformation tissue (referring to Fig.1) phase of direct aging
Than by the cold deformation again tissue of timeliness, the diameter of isometric primary alpha phase reduces, the sheet being precipitated in ag(e)ing process after solid solution
Secondaryαphase content increases, and illustrates that predeformation can promote the precipitation of secondaryαphase in ag(e)ing process.Using WDW-1000 type microcomputers
Almighty test machine is controlled at room temperature with 1.3 × 10-3s-1Strain rate test hair is carried out to the tensile property of part
It is existing, after alloy solid solution without cold deformation the yield strength σ of direct aging0.2About 1040MPa, tensile strength sigmabFor
1106MPa, and the part of timeliness then obtains the high yield strength of 1162MPa again after 3% deflection cold deformation after being dissolved
With the tensile strength of 1205MPa, yield strength and tensile strength respectively than after solid solution without cold deformation the alloy of direct aging
11.73% and 8.93% are improved, with reference to Fig. 5；Elongation percentage δ is increased to 18.8% from 15.6%, and contraction percentage of area ψ is by 37.6%
It is increased to 41%, with reference to Fig. 6.
Embodiment 2
Fig. 3 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 5% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure figure after timeliness 4h.With after solid solution without cold deformation tissue (referring to Fig.1) phase of direct aging
Than by the cold deformation again tissue of timeliness, the diameter of isometric primary alpha phase also reduces, the piece being precipitated in ag(e)ing process after solid solution
Shape secondaryαphase content increases, and illustrates that predeformation can promote the precipitation of secondaryαphase in ag(e)ing process, but length-width ratio is slightly larger.It adopts
With WDW-1000 type microcomputer controlled electronic universal testing machines at room temperature with 1.3 × 10-3s-1Strain rate part is drawn
Stretch performance test, the results showed that, the yield strength of the part of timeliness is again after 5% deflection cold deformation after solid solution
1166MPa, tensile strength 1210MPa, yield strength and tensile strength respectively than after solid solution without cold deformation direct aging
Alloy improve 12.12% and 9.4%, with reference to Fig. 5；Elongation percentage and the contraction percentage of area with it is direct without cold deformation after solid solution
The part of timeliness is suitable, with reference to Fig. 6.
Embodiment 3
Fig. 4 is that TC4 titanium alloys keep the temperature water cooling after 30min at 940 DEG C, after 7% cold stretch deformation at 500 DEG C
Amplify 500 times of metallographic structure figure after timeliness 4h.With after solid solution without cold deformation tissue (referring to Fig.1) phase of direct aging
Than by the cold deformation again tissue of timeliness, the diameter of isometric primary alpha phase also reduces, the piece being precipitated in ag(e)ing process after solid solution
Shape secondaryαphase content increases, and size is smaller, illustrates that predeformation can promote the precipitation of secondaryαphase in ag(e)ing process.Using
WDW-1000 type microcomputer controlled electronic universal testing machines are at room temperature with 1.3 × 10-3s-1Strain rate to the draftability of part
Test discovery can be carried out, the yield strength of the part of timeliness is 1176MPa again after 7% deflection cold deformation after solid solution, is resisted
Tensile strength is 1220MPa, and yield strength and tensile strength improve 13.08% He than the intensity of the alloy of solid solution+timeliness respectively
10.31%, with reference to Fig. 5；Elongation percentage is increased to 18% from 15.6%, and contraction percentage of area ψ is increased to 41% by 37.6%, with reference to figure
6。
In conclusion comparison diagram 5 and Fig. 6 can be seen that, it can be notable using the heat treatment process of solid solution+cold deformation+timeliness
The intensity for improving TC4 titanium alloys, while can also improve its plasticity, be a kind of to be well suited for industrial heat treatment-strengthening process.
Claims (2)
1. a kind of heat treatment method improving TC4 titanium alloys intensity and plasticity, which is characterized in that specifically comprise the following steps：
(1) by TC4 titanium alloys, the 40-50 DEG C of heat preservation below (alpha+beta)/beta transus temperature, soaking time press formula t=η × hmaxMeter
It calculates, wherein η is heating coefficient, usually takes 0.25-0.7mm/min, hmaxFor the maximum effective thickness of part, unit mm, heat preservation
The unit of time t is min；
It (2) will be by water cooling after the TC4 titanium alloy quick tappings after step (1) heat preservation to room temperature；
(3) cold plastic deformation of 3%-7% will be carried out by step (2) TC4 titanium alloys after cooling；
(4) it will be air-cooled to after 450-500 DEG C of ageing treatment 3-4h comes out of the stove by the TC4 titanium alloys after step (3) cold plastic deformation
Room temperature.
2. a kind of heat treatment process improving TC4 titanium alloys intensity and plasticity according to claim 1, which is characterized in that
The cold plastic deformation is cold stretch, and the part needs to enter stove to temperature.
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| CN201810521142.0A CN108374136B (en) | 2018-05-28 | 2018-05-28 | Heat treatment method for improving strength and plasticity of TC4 titanium alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023189A (en) * | 2018-09-06 | 2018-12-18 | 湖南瀚德微创医疗科技有限公司 | A kind of heat treatment process improving ultrasound knife knife bar amplitude |
| CN114115165A (en) * | 2022-01-28 | 2022-03-01 | 深圳市北工实业有限公司 | Production control method and system of casting and forging integrated forming machine |
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| CN102888532A (en) * | 2012-07-13 | 2013-01-23 | 中国科学院金属研究所 | Alpha and beta combined titanium alloy wire for electron beam fused deposition rapid formed structural member with strength level of 920 MPa |
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2018
- 2018-05-28 CN CN201810521142.0A patent/CN108374136B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101435063A (en) * | 2008-12-11 | 2009-05-20 | 西安交通大学 | Heat treatment process for improving plasticity of cold forming beta titanium alloy after aging |
| CN102888532A (en) * | 2012-07-13 | 2013-01-23 | 中国科学院金属研究所 | Alpha and beta combined titanium alloy wire for electron beam fused deposition rapid formed structural member with strength level of 920 MPa |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023189A (en) * | 2018-09-06 | 2018-12-18 | 湖南瀚德微创医疗科技有限公司 | A kind of heat treatment process improving ultrasound knife knife bar amplitude |
| CN109023189B (en) * | 2018-09-06 | 2020-08-04 | 湖南瀚德微创医疗科技有限公司 | Heat treatment process for improving amplitude of cutter bar of ultrasonic cutter |
| CN114115165A (en) * | 2022-01-28 | 2022-03-01 | 深圳市北工实业有限公司 | Production control method and system of casting and forging integrated forming machine |
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