CN109371347A - A kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging - Google Patents
A kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging Download PDFInfo
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- CN109371347A CN109371347A CN201811510266.5A CN201811510266A CN109371347A CN 109371347 A CN109371347 A CN 109371347A CN 201811510266 A CN201811510266 A CN 201811510266A CN 109371347 A CN109371347 A CN 109371347A
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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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- Crystallography & Structural Chemistry (AREA)
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- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The present invention relates to a kind of preparation methods of Ti-6242 titanium alloy tri-state tissue forging, it is characterized in that, specific step is as follows: the Ti-6242 titanium alloy forging forged by two-phase section is carried out nearly β solution heat treatment by step 1 under transformation temperature in 10~25 DEG C of temperature ranges, heat insulating coefficient is carried out by 0.8min/mm, it is air-cooled after heat, obtain the bifurcation tissue that primary alpha phase content is 5%~35%；Step 2 by bifurcation tissue forging that step 1 obtains lower than 5~20 DEG C of step 1 heat treatment temperature at a temperature of carry out repeating solution heat treatment, heat insulating coefficient is carried out by 0.8min/mm, rapid cooling after heat obtains the tri-state tissue Ti-6242 titanium alloy forging being made of 5%~35% primary alpha phase, 10%~30% strip α phase and β transformation tissue；The tri-state tissue Ti-6242 titanium alloy forging that step 3 obtains step 2 carries out aging strengthening model.The present invention efficiently solves the problems, such as that novel aero-engine large size Ti-6242 titanium alloy forging intensity and enduring quality matching are poor, substantially increases forging performance deposit, improves the safety of engine.
Description
Technical field
The present invention relates to titanium alloy technical field of hot working.
Background technique
Ti6242 titanium alloy is a kind of nearly alpha titanium alloy, which be added simultaneously on the basis of Ti-Al base αsolidsolution
Sn and Zr is significantly improved the high-temperature creep resistance of alloy by solution strengthening, the comprehensive function of Al, Sn and Zr
Under, so that alloy is obtained good elevated temperature strength, there are also higher intensity until 540 DEG C.Mainly for the manufacture of aero-engine
Compressor casing and aircraft skin etc. are also widely used in the manufacture of aero-engine compressor disk like members in recent years.
Engine with Ti-6242 titanium alloy forging be usually in two-phase section forging and molding, after forging using nearly β heat treatment+
Air-cooled acquisition bifurcation tissue, can meet substantially intensity 895MPa, surrender 830MPa, elongation percentage 10%, 1170MPa notch it is lasting when
Between be not less than 5 hours technical requirements, and with the continuous improvement of engine level, engine forging size is increasing, biography
There is the ungratified situation of intensity often in system bifurcation tissue forging, although passing through the side of rapid cooling after nearly β heat treatment (water cooling, oil are cold)
Method can effectively improve intensity, but this method inevitably brings enduring quality and plasticity to lose, and causes room temperature notch
The lasting or ungratified situation of temperature-room type plasticity.
Summary of the invention
The technical problems to be solved by the present invention are: cannot be preferable in order to solve bifurcation tissue T i-6242 titanium alloy forging
Ground meets requirement of the large-scale empty engine to intensity and enduring quality, proposes a kind of tri-state tissue Ti-6242 titanium alloy forging
Preparation method promotes Ti-6242 titanium alloy forging strength level significantly, reach intensity 1000MPa, surrender 900MPa with
On, and enduring quality and plasticity arrive improvement simultaneously.
The technical scheme is that
Step 1
Ti-6242 titanium alloy forging by two-phase section forging is carried out in 10~25 DEG C of temperature ranges under transformation temperature close
β solution heat treatment, heat insulating coefficient are carried out by 0.8min/mm, air-cooled after heat, obtain the bifurcation that primary alpha phase content is 5%~35%
Tissue.
Step 2
By bifurcation tissue forging that step 1 obtains lower than 5~20 DEG C of step 1 heat treatment temperature at a temperature of carry out weight
Multiple solution heat treatment, heat insulating coefficient are carried out by 0.8min/mm, and rapid cooling (oil cooling or water cooling) after heat, acquisition is come into being by 5%~35%
The tri-state tissue of α phase, 10%~30% strip α phase and β transformation tissue composition.
This step carries out repeating solution heat treatment at a temperature of being lower than 5~20 DEG C of step 1 temperature, according to the principle that balances each other,
Forging entirety α phase content is compared can increase accordingly under step 1 solid solution temperature, but since forging does not deform, simple heat
Treatment process primary alpha phase content not will increase, therefore the increase of α phase content is to change secondaryαphase in tissue by β to grow up
Come what is realized, so that part secondaryαphase grows up into thick lath by the lamella that step 1 obtains.Rapid cooling after heat treatment (oil it is cold or
Water cooling), make the secondaryαphase being precipitated from high temperature β phase have little time to grow up, is far narrower than the air-cooled obtained β transformation group of step 1
It knits.
Step 3
The tri-state tissue forging that step 2 is obtained carries out aging strengthening model, obtains intensity 1000Mpa or more, elongation percentage
10% or more, 1170MPa notch duration 5 hours or more high-performance tri-state tissue Ti-6242 titanium alloy forgings.
Due to taking rapid cooling after step 2 heat treatment, forging tissue remains high distortion energy, in this step ag(e)ing process
The hardening constituent that middle β transformation tissue is precipitated obtains more nucleation points, therefore hardening constituent more disperse, tiny, substantially increases forging
The intensity of part, while the thick lath structure that step 2 generates improves forging enduring quality and plasticity.
Preferably, the present invention is manufactured for engine Ti-6242 titanium alloy compressor disc.
The beneficial effects of the present invention are: the more conventional bifurcation group of tri-state tissue Ti-6242 titanium alloy forging that the present invention obtains
It knits Ti-6242 titanium alloy forging intensity and improves 10%~15% or more, and enduring quality and plasticity are also suitably promoted, effectively
It solves the problems, such as that novel aero-engine large size Ti-6242 titanium alloy forging intensity and enduring quality matching are poor, mentions significantly
High forging performance deposit, improves the safety of engine.
Detailed description of the invention
Fig. 1 is the Ti-6242 titanium alloy forging tissue morphology figure after prior art heat treatment；
Fig. 2 is the Ti-6242 titanium alloy forging tissue morphology figure after present invention heat treatment.
Specific embodiment
Below by specific embodiment, the present invention is further described in detail.
Certain h type engine h is manufactured with compressor first order integral blade disk using Ti-6242 titanium alloy, forge weight 238Kg,
Forging contour dimension Φ 690 × 205, early period, there are local yielding intensity deficiencies using the bifurcation tissue forging that traditional handicraft obtains
The problem of, typical data are as follows: intensity 920MPa, surrender 810MPa, elongation percentage 17%, 1170MPa notch lasting 52h, typical group
It knits and sees Fig. 1.
Using the present invention, by the forging by two-phase section forging, 20 DEG C of heat preservations are air-cooled to room temperature in 1 hour under transformation temperature, after
30 DEG C repetition heat preservation 1 hour under transformation temperature, oil is cooled to room temperature, finally carries out 595 DEG C to forging, 8 hours ageing treatments obtain
Tissue see Fig. 2, tri-state tissue forging typical case's physicochemical data are as follows: intensity 1090MPa, surrender 970MPa, elongation percentage 19.5%,
The lasting 67h of 1170MPa notch.Fig. 2 sees in typical organization.
Claims (4)
1. a kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging, which is characterized in that specific step is as follows:
Step 1
Consolidate nearly β is carried out in 10~25 DEG C of temperature ranges under transformation temperature by the Ti-6242 titanium alloy forging of two-phase section forging
Molten heat treatment, heat insulating coefficient are carried out by 0.8min/mm, air-cooled after heat, obtain the bifurcation group that primary alpha phase content is 5%~35%
It knits；
Step 2
By bifurcation tissue forging that step 1 obtains lower than 5~20 DEG C of step 1 heat treatment temperature at a temperature of repeat it is solid
Molten heat treatment, heat insulating coefficient are carried out by 0.8min/mm, and rapid cooling after heat is obtained by 5%~35% primary alpha phase, 10%~30%
The tri-state tissue Ti-6242 titanium alloy forging of shape α phase and β transformation tissue composition；
Step 3
The tri-state tissue Ti-6242 titanium alloy forging that step 2 is obtained carries out aging strengthening model, obtain intensity 1000Mpa with
On, 10% or more elongation percentage, the forging of 1170MPa notch duration 5 hours or more high-performance tri-state tissue Ti-6242 titanium alloys
Part.
2. preparation method as described in claim 1, which is characterized in that rapid cooling mode is oily cold or water after heat described in step 2
It is cold.
3. preparation method as described in claim 1, which is characterized in that in step 2, the bifurcation tissue that step 1 is obtained is forged
Part lower than 10 DEG C of step 1 heat treatment temperature at a temperature of carry out repeat solution heat treatment.
4. preparation method as described in claim 1, which is characterized in that the preparation method is closed for engine Ti-6242 titanium
Golden compressor disc manufacture.
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| CN201811510266.5A CN109371347A (en) | 2018-12-11 | 2018-12-11 | A kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging |
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| CN201811510266.5A CN109371347A (en) | 2018-12-11 | 2018-12-11 | A kind of preparation method of Ti-6242 titanium alloy tri-state tissue forging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926274A (en) * | 2020-09-03 | 2020-11-13 | 豪梅特航空机件(苏州)有限公司 | Manufacturing method for improving creep resistance of TI6242 titanium alloy |
| CN112063945A (en) * | 2020-08-28 | 2020-12-11 | 中国科学院金属研究所 | Improve Ti2Heat treatment process for lasting and creep property of AlNb-based alloy |
| CN113862499A (en) * | 2021-08-18 | 2021-12-31 | 中国科学院金属研究所 | Processing and manufacturing method of novel titanium-based composite material with two-state tissue |
| CN114790533A (en) * | 2022-04-09 | 2022-07-26 | 中国科学院金属研究所 | Heat treatment process of TC11 titanium alloy casting |
| CN115161570A (en) * | 2022-07-19 | 2022-10-11 | 西北工业大学重庆科创中心 | Method for improving lasting mechanical property of near-alpha high-temperature titanium alloy by controlling phase proportion |
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| CN103122442A (en) * | 2013-01-15 | 2013-05-29 | 西北工业大学 | Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling |
| WO2013086010A1 (en) * | 2011-12-06 | 2013-06-13 | Chien-Ping Ju | Method for enhancing mechanical strength of a titanium alloy by aging |
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| WO2013086010A1 (en) * | 2011-12-06 | 2013-06-13 | Chien-Ping Ju | Method for enhancing mechanical strength of a titanium alloy by aging |
| CN103122442A (en) * | 2013-01-15 | 2013-05-29 | 西北工业大学 | Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling |
| CN103205662A (en) * | 2013-01-15 | 2013-07-17 | 西北工业大学 | Method of acquiring tri-modal microstructure in near-alpha titanium alloy through furnace cooling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063945A (en) * | 2020-08-28 | 2020-12-11 | 中国科学院金属研究所 | Improve Ti2Heat treatment process for lasting and creep property of AlNb-based alloy |
| CN112063945B (en) * | 2020-08-28 | 2021-12-10 | 中国科学院金属研究所 | Improve Ti2Heat treatment process for lasting and creep property of AlNb-based alloy |
| CN111926274A (en) * | 2020-09-03 | 2020-11-13 | 豪梅特航空机件(苏州)有限公司 | Manufacturing method for improving creep resistance of TI6242 titanium alloy |
| CN113862499A (en) * | 2021-08-18 | 2021-12-31 | 中国科学院金属研究所 | Processing and manufacturing method of novel titanium-based composite material with two-state tissue |
| CN114790533A (en) * | 2022-04-09 | 2022-07-26 | 中国科学院金属研究所 | Heat treatment process of TC11 titanium alloy casting |
| CN115161570A (en) * | 2022-07-19 | 2022-10-11 | 西北工业大学重庆科创中心 | Method for improving lasting mechanical property of near-alpha high-temperature titanium alloy by controlling phase proportion |
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