CN103938137B - A kind of method changing titanium alloy large size bar homogeneity of structure - Google Patents
A kind of method changing titanium alloy large size bar homogeneity of structure Download PDFInfo
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- CN103938137B CN103938137B CN201410136487.6A CN201410136487A CN103938137B CN 103938137 B CN103938137 B CN 103938137B CN 201410136487 A CN201410136487 A CN 201410136487A CN 103938137 B CN103938137 B CN 103938137B
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Abstract
The present invention relates to a kind of method changing titanium alloy large size bar homogeneity of structure, comprise the following steps: step one: cut material, the first fire upsetting pull from all directions; Step 2: the second fire upsetting pull from all directions; Step 3: the 3rd fiery upsetting pull.By six upsetting pulls from all directions of three fire, primary alpha phase (the 10-40%)+β for shaft-like such as forging provide changes the even bifurcation tissue of tissue.This changes forging technology is that tissue preparation is carried out in next step base and die forging.
Description
Technical field
The invention belongs to the processing technique field of titanium alloy material, be specifically related to a kind of titanium alloy large size bar and change forging technology.
Background technology
Along with the increase of titanium alloy forging, the bar specification needed for forging is also increasing, and the control of structure property homogeneity becomes the key of forging structure property.Generally speaking, primary alpha phase and the β bifurcation tissue that changes organizational composition determines primarily of the factor such as texturing temperature and deflection of forging.For obtaining high comprehensive performance uniform bifurcation tissue, except the control problem of the texturing temperature in solution forging forming process and deflection, topmost tissue preparation is in forge piece blank reheating preparation process, and wherein bar changes forging technology is key problem in technology.Because primary alpha phase content is many in the tissue of large scale rod bar, and in strip, and primary alpha phase (10 ~ the 40%)+β that the tissue that forging requires such as is at the shaft-like changes the bifurcation tissue of tissue.Forging is changed, for forging provides uniform structure property to be object of the present invention how by bar.
It is at transformation temperature T that existing bar changes forging technology
β20 ~ 40 DEG C of heating below, carry out four directions or six side's upsetting pulls, are limited to the following scale rod bar of Φ 300mm.For the titanium alloy rod bar of the above specification of Φ 300mm, although four directions upsetting pull or six side's upsetting pulls can improve tissue, large owing to being out of shape dead band in upsetting pull process, deformation uniformity is poor, the defect such as easily to crack in distortion dead band and distorted area, these crack defects are brought to blank even in forging.Find that the strain that four directions or six side's upsetting pulls produce is all little by finite element analysis, limited to disrupting tissue, Grain refinement.
Application number 87107575.X discloses a kind of microstructure of alpha+beta titanium alloys Equiaxed grain crystallization technique, is only applicable to Φ 90 ~ 120mm small-sized bar.Also have the open major diameter fine isometric crystal tissue titanium alloy bar production technique of document, it adopts three upsetting pulls of the every fire of 5 fire, and upsetting pull deflection is more than 110%, complex process, require high to capacity of equipment, energy consumption is large, and this invention can not change the more large scale rod bar of forging more than Φ 300mm.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, obtain uniform tissue, namely the shaft-like primary alpha phase such as to change into by large scale rod bar strip primary alpha phase, and after changing forging by etc. shaft-like primary alpha phase ratio control in the scope of 10 ~ 40%, for next step base and die forging carry out tissue prepare.
The present invention is detected by analog calculation and experiment, upsetting pull from all directions and optimization is utilized to change parameter such as forging deflection, rate of deformation etc., large strain can be produced, distortion dead band is also little, four directions or six side's upsetting pulls are significantly better than to disrupting tissue, Grain refinement, homogeneity of structure, apparently higher than four directions or six side's upsetting pulls, solves a large scale rod bar structure property homogenizing difficult problem of more than Φ 300mm.
The object of the invention is to solve traditional four directions or six side's upsetting pulls distortion dead band is large, deformation uniformity is poor, change the problems such as forging bar specification is little.Titanium alloy large size bar of the present invention is adopted to change forging technology and parameter optimization, for heavy forging structure property homogenizing provides the foundation.
To achieve these goals, technical scheme of the present invention is:
Change a method for titanium alloy large size bar homogeneity of structure, comprise the following steps:
Step one: cut material, the first fire upsetting pull from all directions: intercept the above large-size titanium alloy bar of Φ 300mm, carry out all directions upsetting pull after heating; Upsetting pull from all directions repeats twice.
Preferably, intercepting the above large-size titanium alloy diameter of rod of Φ 300mm is D
0, long l
0for 2 ~ 2.5D of diameter
0doubly, to ensure that jumping-up and pulling have enough deflections, the object of broken strip primary alpha phase can just be reached.
More preferably, first will cut material before jumping-up and be heated to below transformation temperature 25 ~ 40 DEG C, to control the ratio of primary alpha phase.
Preferably, sectional area Upsetting amount is 40 ~ 60%, then with octagon pulling (along fiber direction), column length deflection is 40 ~ 60%; And then carry out second time upsetting pull afterwards, deflection is identical with first time upsetting pull, to reach the object of broken strip primary alpha phase.
Step 2: the second fire upsetting pull from all directions: by forging stock complete for second time upsetting pull in step one, melt down and be heated to below transformation temperature 25 ~ 40 DEG C, repeating step one, complete twice upsetting pull of the second fire, in four upsetting pulls, processing parameter remains unchanged.
Step 3: the 3rd fiery upsetting pull: the forging that changes of the 4th upsetting pull in step 2 is still melted down and is heated to below transformation temperature 25 ~ 40 DEG C, repeating step two, carries out twice upsetting pull of the 3rd fire; The processing parameter of the 5th upsetting pull keeps identical with step one, step 2; 6th upsetting pull is by blank jumping-up, sectional area Upsetting amount 40 ~ 60%, along fiber direction pulling to the pane shape needed.
Pay special attention to, different from rate of deformation during pulling during jumping-up, during jumping-up, rate of deformation controls in lower scope, preferably rate of deformation 0.001 ~ 0.005s during jumping-up
-1, during pulling, rate of deformation then controls at 0.005 ~ 0.01s
-1in scope.Theoretical analysis combines with test and finds, rate of deformation is controlled to complete strip α phase isometry and sufficient dynamic recrystallization within the scope of this.
Advantage of the present invention and beneficial effect are:
The present invention is by cutting material design, utilize deflection and the rate of deformation of upsetting pull from all directions and optimization, can produce large strain, distortion dead band is also little, obviously be better than common four directions or six side's upsetting pulls to the effect of disrupting tissue, crystal grain thinning, its homogeneity of structure is apparently higher than four directions or six side's upsetting pulls.What to adopt upsetting pull from all directions in two-phase region to the above big rod of Φ 300mm changes forging method, and microstructure refine to 2 grades from 7 grades of original big rod, importantly improves the homogeneity of structure of blank, for tissue preparation is carried out in next step base and die forging.Therefore, this technique is adopted (that is: to change forging method-all directions upsetting pull; Change forging temperature-control below transformation temperature 25 ~ 40 DEG C; Deflection arranges-and every fire pulling all controls to control in 40 ~ 60%-rate of deformation with deflection during jumping-up) biscuit that obtains can prepare and organize qualified heavy forging.
Accompanying drawing explanation
Fig. 1 is the mirco structure of the bar tissue-strip primary alpha phase before changing forging.
Fig. 2 be tissue after changing forging-etc. the mirco structure of shaft-like primary alpha phase.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Below in conjunction with accompanying drawing, one embodiment of the present of invention are described.The embodiment of Φ 350mmTA15 titanium alloy rod bar uniform formation preparation method:
Intercept the long 840mm of Φ 350mm large-size titanium alloy bar.
First fire: be heated to 960 DEG C, jumping-up to be slightly about 500mm, high be about 400mm, then with octagon pulling to be slightly about 350mm, height is about 840mm (suitable fiber direction), not round as a ball after having pulled out.And then continue upsetting pull, jumping-up to be slightly about 500mm, high be about 400mm, then pull out thick for about 350mm, height are for about 840mm with octagon.
Second fire: by forging stock complete for second time upsetting pull, still be heated to 960 DEG C, transformation temperature is 990 DEG C, and third time carries out upsetting pull, jumping-up to be slightly about 500mm, high be about 400mm, then with octagon pulling to be slightly about 350mm, height is about 840mm (suitable fiber direction).Under this fire time, repeat the 4th upsetting pull, jumping-up to be slightly about 500mm, high be about 400mm, then with octagon pulling to be slightly about 350mm, height is about 840mm (suitable fiber direction).
3rd fire: the forging that changes of the 4th upsetting pull is still heated to 960 DEG C, carries out upsetting pull the 5th time, jumping-up to be slightly about 500mm, high be about 400mm, then with octagon pulling to be slightly about 350mm, height is about 840mm (suitable fiber direction).Under this fire time, the 6th upsetting pull be by blank jumping-up to thick for about 500mm, high be about 400mm, pull out to 615 × 400 × 330mm along fiber direction.
During jumping-up, rate of deformation is 0.004s
-1, during pulling, rate of deformation is 0.008s
-1in scope.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. change a method for titanium alloy large size bar homogeneity of structure, it is characterized in that, comprise the following steps:
Step one: cut material, the first fire upsetting pull from all directions: intercept the above large-size titanium alloy bar of Φ 300mm, carry out all directions upsetting pull after heating; Upsetting pull from all directions repeats twice;
Step 2: the second fire upsetting pull from all directions: by forging stock complete for second time upsetting pull in step one, melt down and be heated to below transformation temperature 25 ~ 40 DEG C, repeating step one, complete twice upsetting pull of the second fire, in four upsetting pulls, corresponding processing parameter remains unchanged;
Step 3: the 3rd fiery upsetting pull: the forging that changes of the 4th upsetting pull in step 2 is still melted down and is heated to below transformation temperature 25 ~ 40 DEG C, repeating step two, carries out twice upsetting pull of the 3rd fire; 5th time the corresponding processing parameter of upsetting pull keeps identical with step one, step 2; 6th upsetting pull is by blank jumping-up, and sectional area Upsetting amount is 40 ~ 60%, and along fiber direction pulling to the pane shape needed, primary alpha phase (the 10-40%)+β for shaft-like such as forging provide changes the even bifurcation tissue of tissue.
2. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 1, is characterized in that, intercepting the above large-size titanium alloy diameter of rod of Φ 300mm is D
0, long l
0be 2 ~ 2.5D
0, to ensure that jumping-up and pulling have enough deflections, reach the object of broken strip primary alpha phase.
3. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 1 and 2, is characterized in that, first will cut material and be heated to below transformation temperature 25 ~ 40 DEG C, to control the ratio of primary alpha phase before the jumping-up first of every fire.
4. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 1 and 2, it is characterized in that, in the first five upsetting pull, sectional area Upsetting amount is 40 ~ 60%, octagon is 40 ~ 60% along fiber direction pulling column length deflection, to reach the object of broken strip primary alpha phase.
5. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 3, it is characterized in that, in the first five upsetting pull, sectional area Upsetting amount is 40 ~ 60%, octagon is 40 ~ 60% along fiber direction pulling column length deflection, to reach the object of broken strip primary alpha phase.
6. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 1,2 or 5, is characterized in that, different from rate of deformation during pulling during jumping-up, during jumping-up, rate of deformation is 0.001 ~ 0.005s
-1, during pulling, rate of deformation then controls at 0.005 ~ 0.01s
-1in scope; Rate of deformation is controlled can complete strip α phase isometry and sufficient dynamic recrystallization within the scope of this.
7. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 3, is characterized in that, different from rate of deformation during pulling during jumping-up, during jumping-up, rate of deformation is 0.001 ~ 0.005s
-1, during pulling, rate of deformation then controls at 0.005 ~ 0.01s
-1in scope; Rate of deformation is controlled can complete strip α phase isometry and sufficient dynamic recrystallization within the scope of this.
8. a kind of method changing titanium alloy large size bar homogeneity of structure according to claim 4, is characterized in that, different from rate of deformation during pulling during jumping-up, during jumping-up, rate of deformation is 0.001 ~ 0.005s
-1, during pulling, rate of deformation then controls at 0.005 ~ 0.01s
-1in scope; Rate of deformation is controlled can complete strip α phase isometry and sufficient dynamic recrystallization within the scope of this.
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| CN106862451B (en) * | 2015-12-11 | 2018-06-26 | 中国航空工业集团公司北京航空材料研究院 | A kind of titanium alloy alternating temperature rate controlling forging method |
| CN107413998B (en) * | 2017-07-03 | 2019-08-20 | 西部超导材料科技股份有限公司 | A kind of preparation method of Nb47Ti alloy large scale rod bar |
| CN107486524A (en) * | 2017-10-16 | 2017-12-19 | 陕西海恩得工贸有限公司 | A kind of preparation method of titanium alloy cake material |
| CN108097852B (en) * | 2017-12-18 | 2019-06-07 | 西安赛特思迈钛业有限公司 | A kind of forging method of TC4 titanium alloy large size bar |
| CN109226621A (en) * | 2018-10-24 | 2019-01-18 | 湖南金天钛业科技有限公司 | A kind of forging method of larger ratio of height to diameter titan alloy casting ingot |
| CN109622833A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of structural homogeneity control method of big thickness Ti-6Al-2Sn-4Zr-2Mo alloy forged piece |
| CN109622839B (en) * | 2018-12-11 | 2020-06-30 | 陕西宏远航空锻造有限责任公司 | Method for obtaining uniform structure of TC11 titanium alloy round cake blank |
| CN109865788A (en) * | 2019-02-15 | 2019-06-11 | 湖南金天钛业科技有限公司 | A kind of efficient upsetting pull forging method of titanium alloy large size forging stock |
| 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 |
| CN111250639B (en) * | 2020-02-27 | 2021-12-21 | 无锡派克新材料科技股份有限公司 | Blank forming method for GH4169 large-sized special-shaped ring forging |
| 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 |
| CN112275828B (en) * | 2020-10-09 | 2022-04-19 | 中国航发北京航空材料研究院 | Upsetting-drawing deformation method for TB6 titanium alloy large-size bar |
| CN113106206B (en) * | 2021-04-02 | 2022-05-24 | 成都先进金属材料产业技术研究院股份有限公司 | Manufacturing method of 1Cr11Ni2W2MoV heat-resistant steel forging for fastener |
| CN115156451A (en) * | 2022-06-17 | 2022-10-11 | 中国航发北京航空材料研究院 | Method for uniform deformation of structure of large-size titanium alloy bar |
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