CN106637014A - Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging - Google Patents
Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging Download PDFInfo
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- CN106637014A CN106637014A CN201611118488.3A CN201611118488A CN106637014A CN 106637014 A CN106637014 A CN 106637014A CN 201611118488 A CN201611118488 A CN 201611118488A CN 106637014 A CN106637014 A CN 106637014A
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- forging
- scale
- heat treatment
- treatment method
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Classifications
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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
Abstract
The invention relates to the technical field of hot working for performance nonuniformity and deformation of a large-size TC4 forging. According to the invention, uniform surface and center performance of a forging is ensured, and the instability problem of the forging is solved. The invention optimizes the heat treatment process, the heating temperature and the holding time are kept unchanged, and the cooling mode is changed from air cooling into furnace cooling; and the specific furnace cooling mode is that the heating temperature is reduced to 482 DEG C or below, the cooling rate is 55 DEG C/H, and then discharge and air cooling are performed.
Description
Technical field
The present invention relates to large-scale TC4 forging performances it is uneven and deformation technical field of hot working.
Background technology
The TC4 forging studied include two kinds, a class be weight more than 200Kg, effective thickness is large-scale more than 200mm
TC4 forging.This kind of titanium alloy carries out extension test after dissecting, and surface and center portion performance difference are larger, and center portion tensile strength is much
Less than surface tensile strength, but after this forging machine adds, part is center portion forging, that is to say, that our part is used just
That worst part of forging performance.Another kind be length more than 1700mm, wall thickness is only the mutability forging of 30mm or so.
Original heat treatment there are problems that following two, it is difficult to solve.
1) easily it is deformed in the thin arm forging heat treatment process of large-scale strip, particularly with the forging for having non-machine plus face
Part, linearity has high demands, and using conventional heat treating regime, often makes forging not reach requirement, and deforms serious.
2) to large-scale TC4 forging (forging of the effective thickness more than 150mm), using conventional Technology for Heating Processing, forging is dissected
Find after part, inside and outside tensile property differs greatly, and after forging machine adds, low that of the always center portion tensile strength for staying
Point.
So, need solution forging performance uneven and the two problems of mutability.
The content of the invention
The technical problem to be solved is：First, ensure that forging surface and center portion performance are uniform.2nd, forging is solved
Variable sex chromosome mosaicism.The content of the invention is that Technology for Heating Processing is optimized, and heating-up temperature and temperature retention time are constant, by the type of cooling
Stove is changed to by air cooling cold, the cold mode of concrete stove is to drop to less than 482 DEG C from heating-up temperature, cooling rate is 55 DEG C/H, sky of then coming out of the stove
It is cold.
The technical scheme is that：
A kind of heat treatment method for reducing large-scale TC4 forging inhomogeneities and dimensional instability：
Heat treatment process parameter：
Heating-up temperature：700-800℃
Temperature retention time：3-6 hours
The type of cooling：It is cooled to less than 482 DEG C, cooling rate is 55 DEG C/H, air cooling of then coming out of the stove.
Specific embodiment
The present invention is described in further detail below by two specific embodiments.
A kind of heat treatment method for reducing large-scale TC4 forging inhomogeneities and dimensional instability, especially described large-scale TC4
Forging is that large-scale TC4 hangs forging, and size is 1800mm × 420mm × 250mm, weight is 200KG, effective thickness is 120mm；
Including step specific as follows：
The power supply of electrothermal furnace is opened, electrothermal furnace instrument is set, wherein：The temperature of the electrothermal furnace instrument of setting is 780 DEG C, sets
The cooling rate that the temperature retention time put is 4 hours, arranged is 50 DEG C/H；When temperature rises to 650 DEG C～700 DEG C, by large-scale TC4 forging
Load electrothermal furnace to be heated；Come out of the stove after the forging is cooled to 482 DEG C～400 DEG C air cooling.
Forging after air cooling is dissected, at multiple positions of forging, including center portion and surface, 8 longitudinal stretchings are done altogether
Sample, 4 cross directional stretch samples, 4 are high to tensile sample.As a result find, performance is uniform, tensile strength and yield strength difference
In 10MPa, elongation percentage and reduction of area are within 2%.Simultaneously there is not serious warpage in forging, and machine adds factory to react, and internal stress is little
Good machine adds, and machine is placed after adding does not occur substantially deformation for 2 weeks.
Claims (2)
1. a kind of heat treatment method for reducing large-scale TC4 forging inhomogeneities and dimensional instability, including step specific as follows：
Electrothermal furnace is opened, electrothermal furnace instrument is set, wherein：During the insulation that the temperature of the electrothermal furnace instrument of setting is 780 DEG C, arranged
Between for 4 hours, arrange cooling rate be 50 DEG C/H；When temperature rises to 650 DEG C～700 DEG C, large-scale TC4 forging is loaded into electrothermal furnace
Heated；Come out of the stove after the forging is cooled to 400 DEG C～482 DEG C air cooling.
2. a kind of heat treatment method for reducing large-scale TC4 forging inhomogeneities and dimensional instability according to claim 1, its
It is characterised by：Described large-scale TC4 forging is that large-scale TC4 hangs forging, and size is 1800mm × 420mm × 250mm, weight is
200KG, effective thickness are 120mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118488.3A CN106637014A (en) | 2016-12-07 | 2016-12-07 | Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118488.3A CN106637014A (en) | 2016-12-07 | 2016-12-07 | Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106637014A true CN106637014A (en) | 2017-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611118488.3A Pending CN106637014A (en) | 2016-12-07 | 2016-12-07 | Heat treatment method for reducing nonuniformity and dimensional instability of large-size TC4 forging |
Country Status (1)
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| CN (1) | CN106637014A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964996A (en) * | 2019-12-06 | 2020-04-07 | 陕西宏远航空锻造有限责任公司 | Method for reducing heat treatment residual stress of thick-section titanium alloy forging |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321187A (en) * | 2006-05-31 | 2007-12-13 | Nippon Steel Corp | METHOD FOR PRODUCING beta TITANIUM ALLOY MATERIAL FOR COLD WORKING, AND METHOD FOR COLD-WORKING beta TITANIUM ALLOY MATERIAL |
| CN101580923A (en) * | 2009-04-30 | 2009-11-18 | 上海桦厦实业有限公司 | Forging method for improving performance of TC4 titanium alloy cast ingot |
| CN103938136A (en) * | 2014-04-08 | 2014-07-23 | 中国航空工业集团公司北京航空材料研究院 | Titanium alloy quasi-recrystallization annealing process |
| CN105032980A (en) * | 2015-09-09 | 2015-11-11 | 航天海鹰(哈尔滨)钛业有限公司 | Thin-wall titanium alloy complex variable-cross-section pipe forming method and application |
-
2016
- 2016-12-07 CN CN201611118488.3A patent/CN106637014A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007321187A (en) * | 2006-05-31 | 2007-12-13 | Nippon Steel Corp | METHOD FOR PRODUCING beta TITANIUM ALLOY MATERIAL FOR COLD WORKING, AND METHOD FOR COLD-WORKING beta TITANIUM ALLOY MATERIAL |
| CN101580923A (en) * | 2009-04-30 | 2009-11-18 | 上海桦厦实业有限公司 | Forging method for improving performance of TC4 titanium alloy cast ingot |
| CN103938136A (en) * | 2014-04-08 | 2014-07-23 | 中国航空工业集团公司北京航空材料研究院 | Titanium alloy quasi-recrystallization annealing process |
| CN105032980A (en) * | 2015-09-09 | 2015-11-11 | 航天海鹰(哈尔滨)钛业有限公司 | Thin-wall titanium alloy complex variable-cross-section pipe forming method and application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964996A (en) * | 2019-12-06 | 2020-04-07 | 陕西宏远航空锻造有限责任公司 | Method for reducing heat treatment residual stress of thick-section titanium alloy forging |
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Application publication date: 20170510 |
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