CN105483586A - Forging method for improving TC18 titanium alloy structure property - Google Patents
Forging method for improving TC18 titanium alloy structure property Download PDFInfo
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- CN105483586A CN105483586A CN201510924727.3A CN201510924727A CN105483586A CN 105483586 A CN105483586 A CN 105483586A CN 201510924727 A CN201510924727 A CN 201510924727A CN 105483586 A CN105483586 A CN 105483586A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- Forging (AREA)
Abstract
The invention relates to a forging method for improving the TC18 titanium alloy structure property, and belongs to the field of material processing. A microscopic structure of a TC18 titanium alloy is sensitive in temperature influence, during two-phase-zone forging, the microscopic structure is composed of conversion structures of a primary alpha phase and a beta phase, along with rising of the forging temperature, the content of the primary alpha phase is decreased, the size is increased, and the equiaxial degree is increased. During quasi beta forging above a phase change point, if the heat preservation time and the deformation amount are appropriately controlled, an even basket-weave microstructure can be obtained, even though the room-temperature plasticity of the structure is worse than an equiaxial structure, the strength is high, and the high-temperature behavior, the breaking tenacity and the fatigue property are better than those of the equiaxial structure; but above the phase point, a Widmannstatten structure can be obtained if the heat preservation time is too long; and compared with the equiaxial structure, the room temperature strength and high temperature strength of the Widmannstatten structure are improved, the stretching plasticity is reduced, and the room temperature impact is reduced. By means of the forging method, the structure reliability of a TC18 titanium alloy component is improved while the high strength, the high plasticity and the high breaking tenacity are obtained.
Description
Technical field
The present invention relates to a kind of forging method improving TC18 titanium alloy structure property, the titanium alloy processed has the good basket shape tissue of high strength, high tenacity, high-ductility and hardening capacity, belongs to material processing field.
Background technology
TC18 is a kind of titanium alloy of high-alloying, and its nominal composition is Ti-5Al-5Mo-5V-1Fe, T beta transus temperature interval is 870 DEG C ~ 880 DEG C.This alloy has high strength, high-ductility, hardening capacity is good, weldability is good advantage, is thus widely used in the fuselage of aircraft and the large-scale load bearing structure part of landing gear, and this alloy can also for the manufacture of the part of long term operation at 350 DEG C ~ 400 DEG C simultaneously.TC18 uses usually in an annealed state, also can use under as-quenched condition.The heating of forging and the control of deformation process are the difficult points of this material produce, have important impact to inner structure and properties.Some data discuss the impact of conventional forging temperature on TC18 titanium alloy structure and properties, but less to TC18 accurate β forging research.
TC18 titanium alloy is when 3t flat-die hammer is produced, under accurate β forges temperature, the result that affects of forging and molding alloy structure property shows: microstructure is responsive by the impact of temperature, when forging in two-phase region, microstructure is made up of primary alpha phase and β phase in version tissue, with the rising of forging temperature, primary alpha phase content tails off, and size increases, and waits axle degree to increase.If soaking time and deformation amount controlling is proper obtains uniform basket tissue during accurate β forging more than transformation temperature, although this tissue temperature-room type plasticity is not as equiaxed structure, but its intensity is high, high-temperature behavior, fracture toughness property and fatigue property are all better than equiaxed structure, if but long meeting obtains this tissue of Widmannstatten structure relative to equiaxed structure when being incubated more than transformation temperature, room temperature and hot strength increase, stretching plastic reduces, room temperature impact reduces, and therefore in DEFORMATION POINTS, the soaking time of blank controls most important.Forging is the critical process interior tissue of forging and performance to material impact.How accurately controlling to forge under beta transus temperature and making it obtain intended tissue is the key issue that TC18 titanium alloy quasi-beta is forged.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of forging method improving TC18 titanium alloy structure property, and make it while acquisition high strength, high-ductility and high-fracture toughness, that improves TC18 titanium alloy member organizes reliability.
The technical scheme that the present invention takes, a kind of forging method improving TC18 titanium alloy structure property, the method comprises the following steps:
(1) forging is changed under titanium alloy blank transformation temperature
Changing forging temperature is T β-(45 DEG C ~ 30 DEG C), heating coefficient is 0.5 ~ 0.8min/mm, insulation is after setting-up time, upsetting pull on flat-die hammer of coming out of the stove immediately changes forging, temperature control simultaneously, deflection is 20% ~ 30%, makes blank close to compact dimensions, every work step upsetting pull deflection is upset ratio 1:(2 ~ 2.5), pull out than (1.5 ~ 2): 1;
(2) defect detecting test of intermediate blank;
(3) accurate β forging molding in transformation temperature
Forging preheating temperature is T β-(45 DEG C ~ 30 DEG C), and heating coefficient is 0.5 ~ 0.8min/mm, and forging temperature is T β+(10 DEG C ~ 15 DEG C), insulation 20 ~ 30min, and forging deformation amount is 15% ~ 20%, and forging time is less than 2min; Blank rotary shift time is less than or equal to 20 seconds;
(4) thermal treatment
Placed in the holding furnace of 810 ~ 840 DEG C by blank, heating coefficient is 1.5 ~ 2min/mm, cools to 750 ~ 760 DEG C with the furnace, heating coefficient is 1.5-2min/mm, air cooling of coming out of the stove, and places in the holding furnace of 610 ~ 640 DEG C, heating coefficient is 3min/mm, air cooling of coming out of the stove;
(5) 100% carry out low power inspection, flaw detection and the inspection of sampling high power and mechanical property inspection.
Further, change in forging step, under 3t flat-die hammer, weight is the blank of 20Kg ~ 40Kg, and point 2 ~ 4 fire complete.
Further, in forging step, Control for Kiln Temperature adopts thermocouple temperature measurement, carries out feedback control.
Further, changing in forging and forging step, frock and use instrument are carried out to the preheating of 200 DEG C ~ 300 DEG C.
The invention has the beneficial effects as follows: the forging method that can obtain a kind of higher TC18 titanium alloy structure property by the present invention, makes it the requirement reaching expection of intensity, plasticity and fracture toughness property, that improves TC18 titanium alloy member organizes reliability.
Embodiment
Improve a forging method for TC18 titanium alloy structure property, first α is carried out to titanium alloy blank
on axleregion changes forging, then carry out accurate β phase to blank to forge (being the forging method that more than a kind of transformation temperature heats), finally carry out the thermal treatment of accurate β phase, it is made to begin to take shape a kind of tiny intensive basket texture after forging, in last accurate β phase heat treatment process, grain growth is subject to dislocation restrictions a large amount of in the basket texture of crisscross intertexture and deformation process, only has the tiny sheet α in β crystal grain
turnrearrange combination mutually, under the driving of a large amount of energy of dislocation, forming core is grown up and is formed new fine and closely woven texture, and grain boundaries is by the interrupted α of tiny dispersion
turnformed mutually, greatly improve the integrated performance index of TC18 titanium alloy.
Embodiment one
1.1 starting material
(1) starting material chemical composition is rechecked by standard GB/T4698, and result is qualified;
(2) starting material mechanical property is rechecked by standard YMS1507, and result is qualified, as shown in table 1;
(3) starting material macrostructure: without clear crystalline substance, have no metallurgical imperfection, standard: GB/T5168.
Table 1 starting material mechanical property
(4) starting material mirco structure: for waiting axle α tissue uniformly, standard: GB/T5168;
(5) starting material flaw detection: by Φ 2.0 flat-bottom hole, result is qualified, standard: the A level in YMS1507;
(6) starting material KIC: normal data: >=55, actual measurement: 59.5 ~ 58.6, result is qualified, standard: YMS1507.
1.2 forgings, thermal treatment, machine add and check
(1) because starting material microstructure is relatively more even, T β-30 DEG C of bases 160 × 160 × 180 under transformation temperature, then adopt accurate β to forge, make its interior tissue change required basket tissue into;
(2) accurate β forging temperature is by (T β-30 DEG C)+(T β+15 DEG C) forging, work step be 160 × 160 × 180 forgings to 130 ± 3 × 190 ± 3 × 180 ± 3 (180 is former grain direction), 1 fire completes;
(3) blank is placed by thermal treatment in the holding furnace of 830 DEG C, and insulation 260mm, cools to 750 DEG C with the furnace, be incubated as 260min, and air cooling of coming out of the stove is to normal temperature, and reentering stove in the holding furnace of 620 DEG C is incubated 390mm, and air cooling of coming out of the stove is to normal temperature;
(4) machine adds rear flaw detection, and detect a flaw by the A level forging 100% in YMS1508 standard, conclusion is qualified;
(5) physics and chemistry presses 4GS-250-2011, and forging mechanical property in table 3, hydrogen analysis in table 4, has no metallurgical imperfection in table 2, KIC.
Table 2 forging room-temperature mechanical property
Table 3 forging KIC
| Standard | Actual measurement 1 | Actual measurement 2 | Conclusion |
| ≥60 | 77.1 | 72.7 | Qualified |
Table 4 forging hydrogen is analyzed
| Standard | Actual measurement | Conclusion |
| ≤0.015 | 0.0015 | Qualified |
Claims (4)
1. improve a forging method for TC18 titanium alloy structure property, it is characterized in that, the method comprises the following steps:
(1) forging is changed under titanium alloy blank transformation temperature
Changing forging temperature is T β-(45 DEG C ~ 30 DEG C), heating coefficient is 0.5 ~ 0.8min/mm, insulation is after setting-up time, upsetting pull on flat-die hammer of coming out of the stove immediately changes forging, temperature control simultaneously, deflection is 20% ~ 30%, makes blank close to compact dimensions, every work step upsetting pull deflection is upset ratio 1:(2 ~ 2.5), pull out than (1.5 ~ 2): 1;
(2) defect detecting test of intermediate blank;
(3) accurate β forging molding in transformation temperature
Forging preheating temperature is T β-(45 DEG C ~ 30 DEG C), and heating coefficient is 0.5 ~ 0.8min/mm, and forging temperature is T β+(10 DEG C ~ 15 DEG C), insulation 20 ~ 30min, and forging deformation amount is 15% ~ 20%, and forging time is less than 2min; Blank rotary shift time is less than or equal to 20 seconds;
(4) thermal treatment
Placed in the holding furnace of 810 ~ 840 DEG C by blank, heating coefficient is 1.5 ~ 2min/mm, cools to 750 ~ 760 DEG C with the furnace, heating coefficient is 1.5-2min/mm, air cooling of coming out of the stove, and places in the holding furnace of 610 ~ 640 DEG C, heating coefficient is 3min/mm, air cooling of coming out of the stove;
(5) 100% carry out low power inspection, flaw detection and the inspection of sampling high power and mechanical property inspection.
2. forging method according to claim 1, is characterized in that: change in forging step, under 3t flat-die hammer, weight is the blank of 20Kg ~ 40Kg, and point 2 ~ 4 fire complete.
3. forging method according to claim 1, is characterized in that: in forging step, Control for Kiln Temperature adopts thermocouple temperature measurement, carries out feedback control.
4. forging method according to claim 1, is characterized in that: changing in forging and forging step, frock and use instrument are carried out to the preheating of 200 DEG C ~ 300 DEG C.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591754A (en) * | 2016-12-12 | 2017-04-26 | 陕西宏远航空锻造有限责任公司 | Forging method using flat-die hammer to improve structure property of TC21 titanium alloy |
| CN106694770A (en) * | 2016-12-15 | 2017-05-24 | 陕西宏远航空锻造有限责任公司 | Forging method of TC21 titanium alloy |
| CN106694772A (en) * | 2016-12-15 | 2017-05-24 | 陕西宏远航空锻造有限责任公司 | Forging method of TC17 alloy beta forging journal forged piece for aero-engine |
| CN109261865A (en) * | 2018-09-29 | 2019-01-25 | 西安飞机工业（集团）有限责任公司 | A kind of quasi- β forging deformation control method of TC18 titanium alloy die forging part |
| CN109865787A (en) * | 2019-02-15 | 2019-06-11 | 湖南金天钛业科技有限公司 | A kind of forging method obtaining uniform mesh basket tissue T C18 forging |
| CN110814250A (en) * | 2019-11-13 | 2020-02-21 | 中国航发动力股份有限公司 | Forming method of disc-shaped forging |
| CN111118424A (en) * | 2020-02-27 | 2020-05-08 | 无锡派克新材料科技股份有限公司 | Titanium alloy shaping method |
| CN111390081A (en) * | 2020-03-19 | 2020-07-10 | 中国科学院金属研究所 | Preparation process of TC25G titanium alloy forging with high creep resistance and high fracture toughness |
| CN112355214A (en) * | 2020-10-20 | 2021-02-12 | 湖南金天钛业科技有限公司 | Preparation method of large-size forging for heavy rocket binding support |
| CN112642976A (en) * | 2020-12-01 | 2021-04-13 | 太原理工大学 | Two-stage non-isothermal forging method for controlling titanium alloy beta forging texture |
| CN117696798A (en) * | 2023-12-13 | 2024-03-15 | 陕西鼎益科技有限公司 | Bar forming method for improving mechanical properties of TC18 titanium alloy bar |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591754A (en) * | 2016-12-12 | 2017-04-26 | 陕西宏远航空锻造有限责任公司 | Forging method using flat-die hammer to improve structure property of TC21 titanium alloy |
| CN106694770A (en) * | 2016-12-15 | 2017-05-24 | 陕西宏远航空锻造有限责任公司 | Forging method of TC21 titanium alloy |
| CN106694772A (en) * | 2016-12-15 | 2017-05-24 | 陕西宏远航空锻造有限责任公司 | Forging method of TC17 alloy beta forging journal forged piece for aero-engine |
| CN106694772B (en) * | 2016-12-15 | 2019-05-21 | 陕西宏远航空锻造有限责任公司 | A kind of aero-engine forges the forging method of axle journal forging with TC17 alloy β |
| CN109261865A (en) * | 2018-09-29 | 2019-01-25 | 西安飞机工业（集团）有限责任公司 | A kind of quasi- β forging deformation control method of TC18 titanium alloy die forging part |
| CN109865787A (en) * | 2019-02-15 | 2019-06-11 | 湖南金天钛业科技有限公司 | A kind of forging method obtaining uniform mesh basket tissue T C18 forging |
| CN110814250B (en) * | 2019-11-13 | 2021-06-29 | 中国航发动力股份有限公司 | Forming method of disc-shaped forging |
| CN110814250A (en) * | 2019-11-13 | 2020-02-21 | 中国航发动力股份有限公司 | Forming method of disc-shaped forging |
| CN111118424A (en) * | 2020-02-27 | 2020-05-08 | 无锡派克新材料科技股份有限公司 | Titanium alloy shaping method |
| CN111390081A (en) * | 2020-03-19 | 2020-07-10 | 中国科学院金属研究所 | Preparation process of TC25G titanium alloy forging with high creep resistance and high fracture toughness |
| CN111390081B (en) * | 2020-03-19 | 2022-08-09 | 中国科学院金属研究所 | Preparation process of TC25G titanium alloy forging with high creep resistance and high fracture toughness |
| CN112355214A (en) * | 2020-10-20 | 2021-02-12 | 湖南金天钛业科技有限公司 | Preparation method of large-size forging for heavy rocket binding support |
| CN112355214B (en) * | 2020-10-20 | 2022-06-10 | 湖南金天钛业科技有限公司 | Preparation method of large-size forging for heavy rocket binding support |
| CN112642976A (en) * | 2020-12-01 | 2021-04-13 | 太原理工大学 | Two-stage non-isothermal forging method for controlling titanium alloy beta forging texture |
| CN117696798A (en) * | 2023-12-13 | 2024-03-15 | 陕西鼎益科技有限公司 | Bar forming method for improving mechanical properties of TC18 titanium alloy bar |
| CN117696798B (en) * | 2023-12-13 | 2024-05-28 | 陕西鼎益科技有限公司 | Bar forming method for improving mechanical properties of TC18 titanium alloy bar |
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