CN108057829A - A kind of forging method for improving titanium alloy forging stock structural homogenity - Google Patents
A kind of forging method for improving titanium alloy forging stock structural homogenity Download PDFInfo
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- CN108057829A CN108057829A CN201711336772.2A CN201711336772A CN108057829A CN 108057829 A CN108057829 A CN 108057829A CN 201711336772 A CN201711336772 A CN 201711336772A CN 108057829 A CN108057829 A CN 108057829A
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- forging
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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
- B21J5/008—Incremental forging
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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
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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Abstract
The invention discloses a kind of forging methods for improving titanium alloy forging stock structural homogenity, and the phase transition temperature β t of titanium alloy blank to be forged are measured using Differential scanning calorimetry；At a temperature of (β t+100) DEG C to (β t+150) DEG C, 4 6h are kept the temperature, by blank forging to be forged to stock of square；By obtained stock of square at a temperature of (β t 20) DEG C to (β t 10) DEG C, 2 4h are kept the temperature, two fire time forgings is carried out, obtained stock of square is subjected to free pulling, until its deflection reaches 50% the 60% of total deformation, the stock of square after freely pulling out is obtained；Stock of square after freely being pulled out what is obtained rotates 45° angle with the central axis of its length direction, is suppressed, draws final stock of square；Forging stock cross section macrostructure after being processed using the present invention is uniform, and crystal boundary is clear, without special-shaped piebald defect；Mirco structure uniformity, it is whole that mesh basket tissue or equiaxed structure, edge and core structure indifference is presented.
Description
【Technical field】
The invention belongs to titanium alloy hot-working fields, are specially a kind of forging side for improving titanium alloy forging stock structural homogenity
Method.
【Background technology】
Since deformation resistance is high, hot processing temperature narrow scope, hot-working is also easy to produce crackle, adds system titanium alloy
Make difficulty.Titanium alloy belongs to one of alloy for being most difficult to forging, the processing history of titanium alloy forging and forging parameter, final to its
Microscopic structure and its mechanical property have obvious action, and its influence degree may be than other any commonly employed forged materials all
Greatly.Therefore, in the forging of titanium alloy, forging shape feasible in cost is not only established, but also is heat-treated and is combined with it, is led to
Cross thermomechanical treatment establish well with specific microscopic structure, to obtain expected mechanical property.
Traditional forging method is using more than β phase transition points (100~150 DEG C) progress ingot formations, two fire time forging temperature
Degree (20-30 DEG C) beginning, alpha+beta two-phase end of extent more than β phase transition points.Forging stock structural homogenity prepared by traditional forging method
Poor, macrostructure is revealed as " fork-shaped " defect, and as shown in Figure 2, microscopic structure differs greatly, and is isometric group inside " fork-shaped "
It knits or mesh basket tissue, " fork-shaped " is Widmannstatten structure or lamellar structure in addition.What such low, microdefect coexisted is organized in follow-up
It will not be eliminated in processing, eventually influence material fractography uniformity and mechanical property uniformity.
【The content of the invention】
The object of the present invention is to provide a kind of forging method for improving titanium alloy forging stock structural homogenity, to solve tradition forging
The method of making causes forging stock cross section low power " fork-shaped " defect and the non-uniform problem of mirco structure.
The present invention uses following technical scheme：It is a kind of improve titanium alloy forging stock structural homogenity forging method, including with
Lower step：
Step 1, the phase transition temperature β t that titanium alloy blank to be forged is measured using Differential scanning calorimetry；
Step 2, at a temperature of (β t+100) DEG C to (β t+150) DEG C, 4-6h is kept the temperature, by blank forging to be forged to square
Blank；
Step 3, by the stock of square obtained in step 2 at a temperature of (β t-20) DEG C to (β t-10) DEG C, keep the temperature 2-4h, into
Two fire time forging of row, concretely comprises the following steps：
The stock of square obtained in step 2 is carried out free pulling by step 3.1, until its deflection reaches total deformation
50%-60%, obtain the stock of square after freely pulling out；
Step 3.2, freely pulled out what is obtained in step 3.1 after stock of square revolved with the central axis of its length direction
Turn 45° angle, suppressed, draw final stock of square.
Further, pressing process is in step 3.2：
It is suppressed since four sides of the length direction of the stock of square after rotating 45° angle, until blank is formed positive eight
Side shape continues to suppress octagon blank, until drawing final stock of square.
Further, the heating process in each step is realized by electric furnace, and insulating process uses Segmented heating
Method.
Further, pressing process uses 1600T forcing presses in step 3.2.
Further, 15~20min of pressing process time, final stock of square temperature after the completion of suppressing for 850 DEG C~
900℃。
The beneficial effects of the invention are as follows：The present invention is simple to operation, does not increase forging times, does not increase forging cost；Institute
Forging stock cross section macrostructure it is uniform, crystal boundary is clear, without special-shaped piebald defect；Mirco structure uniformity, it is whole that net is presented
Basket tissue or equiaxed structure, edge and core structure indifference；Qualified blank is provided for the following process of material, is ensured
Materials microstructure and performance, the forging stock cross section macrostructure after being processed using the present invention is uniform, and crystal boundary is clear, no abnormity flower
Spot defect；Mirco structure uniformity, it is whole that mesh basket tissue or equiaxed structure, edge and core structure indifference is presented.
【Description of the drawings】
Fig. 1 is the cross section of blank in a kind of each step of forging method for improving titanium alloy forging stock structural homogenity of the present invention
Schematic shapes；
Fig. 2 is that there are low power " fork-shaped " defect maps for the obtained stock of square of existing forging method；
Fig. 3 is the stock of square low power group that the TC20 titanium alloys cross section length of side obtained in the embodiment of the present invention 1 is 100mm
Knit figure；
Fig. 4 is that the stock of square edge that the TC4 titanium alloys cross section length of side obtained in the embodiment of the present invention 2 is 120mm is shown
Micro-assembly robot figure；
Fig. 5 is that the stock of square center portion that the TC4 titanium alloys cross section length of side obtained in the embodiment of the present invention 2 is 120mm is shown
Micro-assembly robot figure.
【Specific embodiment】
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The invention discloses a kind of forging methods for improving titanium alloy forging stock structural homogenity, comprise the following steps：
Step 1, the phase transition temperature β t using Differential scanning calorimetry titanium alloy blank to be forged.
Step 2, at a temperature of (β t+100) DEG C to (β t+150) DEG C, 4-6h is kept the temperature, by blank forging to be forged to square
Blank.
Step 3, by the stock of square obtained in step 2 at a temperature of (β t-20) DEG C to (β t-10) DEG C, keep the temperature 2-4h, into
Two fire time forging of row, concretely comprises the following steps：
The stock of square obtained in step 2 is carried out free pulling by step 3.1, until its deflection reaches total deformation
50%-60%, obtain the stock of square after freely pulling out；
Step 3.2, freely pulled out what is obtained in step 3.1 after stock of square revolved with the central axis of its length direction
Turn 45° angle, suppressed, draw final stock of square.
Pressing process is：Using 1600T forcing presses, from four sides of the length direction of the stock of square after rotation 45° angle
Start to suppress, until blank is formed octagon, continue to suppress octagon blank, until drawing final stock of square.Pressure
15~20min of process time processed, the final stock of square temperature after the completion of suppressing are 850 DEG C~900 DEG C.If pressing time mistake
Long, blank temperature is too low, and it is unqualified to easily lead to the blank finally drawn.
Heating process in each of the above step is realized by electric furnace, and insulating process uses Segmented heating method.
(alpha+beta) Type Titanium Alloy ingot casting, the phase transition temperature that titanium alloy is measured using Differential scanning calorimetry is 973 DEG C；Using segmented
Heating means are kept the temperature in gas type heating stove, and design temperature is 1073~1123 DEG C of progress cogging forgings, is pulled out to square forging stock；
Two fire time forgings are carried out to forging stock after cogging, are heated using electric furnace, temperature is 953~963 DEG C, and forging direction is depressed for four sides,
Deflection is the 50~60% of final forging stock；At this point, square billet is rotated 45° angle, pull out by former four corners, once depress
To approximate octagon；Finally depress to the final forging stock size of needs, final forging temperature control is at 850~900 DEG C, angle originally
Portion is depressed into new plane completely, and four sides originally switchs to four new corners.
Embodiment 1：The TC20 diphasic titanium alloy ingot castings of a diameter of Φ 380mm, the phase transformation of the alloy is measured using Differential scanning calorimetry
Point is 1017 DEG C；Cogging forging, the pros of cogging to 170~of 190mm are carried out to the ingot casting through 1117~1167 DEG C first
Forging stock (square billet that i.e. the cross section length of side is 170mm-190mm)；Two fire time forgings are carried out to square billet, it is 997~1007 to play forging temperature
DEG C, it is forged using the mode of four sides forging to 140~of 150mm；Square billet is rotated into 45° angle, is pulled out by former four corners
Length is depressed at twice, once depresses to approximate octagon, and secondary to depress to 100~105mm, final forging temperature is 890 ± 5
℃.For 100 macrostructures of TC20 titanium alloys after present invention forging as shown in figure 3, fractography is uniform, crystal grain is clear, without " fork
Shape " defect.
Embodiment 2：The TC4 diphasic titanium alloy ingot castings of a diameter of Φ 460mm measure the transformation temperature of the alloy using Differential scanning calorimetry
For 971 DEG C；Cogging forging, the square forging of cogging to 190~of 210mm are carried out to the ingot casting through 1071~1121 DEG C first
Base；Two fire time forgings are carried out to square billet, it is 951~961 DEG C to play forging temperature, is forged using the mode of four sides forging to 150~of
160mm；Square billet is rotated into 45° angle, pulls out by former four corners and depresses at twice, once depress to approximate octagon,
Secondary to depress to 115~120mm, final forging temperature is 870 ± 5 DEG C.TC4 titanium alloys 120 after present invention forging is micro-
Tissue is mesh basket tissue, edge and core structure uniformity as shown in Fig. 4 (edge) and Fig. 5 (center portion).
Claims (5)
1. a kind of forging method for improving titanium alloy forging stock structural homogenity, which is characterized in that comprise the following steps：
Step 1, the phase transition temperature β t that titanium alloy blank to be forged is measured using Differential scanning calorimetry；
Step 2, at a temperature of (β t+100) DEG C to (β t+150) DEG C, 4-6h is kept the temperature, by blank forging to be forged to stock of square；
Step 3, by the stock of square obtained in step 2 at a temperature of (β t-20) DEG C to (β t-10) DEG C, keep the temperature 2-4h, carry out two
Fiery forging, concretely comprises the following steps：
The stock of square obtained in step 2 is carried out free pulling by step 3.1, until its deflection reaches total deformation
50%-60% obtains the stock of square after freely pulling out；
Step 3.2, freely pulled out what is obtained in step 3.1 after stock of square rotated with the central axis of its length direction
45° angle is suppressed, and draws final stock of square.
2. improve the forging method of titanium alloy forging stock structural homogenity as described in claim 1, which is characterized in that step 3.2
Middle pressing process is：
It is suppressed since four sides of the length direction of the stock of square after rotating 45° angle, until blank is formed octagon,
Continue to suppress octagon blank, until drawing final stock of square.
3. improve the forging method of titanium alloy forging stock structural homogenity as claimed in claim 1 or 2, which is characterized in that each
Heating process in step is realized by electric furnace, and insulating process uses Segmented heating method.
4. improve the forging method of titanium alloy forging stock structural homogenity as claimed in claim 1 or 2, which is characterized in that step
Pressing process uses 1600T forcing presses in 3.2.
5. improve the forging method of titanium alloy forging stock structural homogenity as claimed in claim 1 or 2, which is characterized in that described
15~20min of pressing process time, the final stock of square temperature after the completion of suppressing are 850 DEG C~900 DEG C.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396311A (en) * | 2018-12-11 | 2019-03-01 | 陕西宏远航空锻造有限责任公司 | A kind of press machine titanium alloy beta forging molding forging method and device |
| 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 |
| CN110216234A (en) * | 2018-11-24 | 2019-09-10 | 西部超导材料科技股份有限公司 | A kind of forging method improving alpha-beta diphasic titanium alloy forging stock structural homogenity |
| CN111940654A (en) * | 2020-08-12 | 2020-11-17 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank |
| CN112264566A (en) * | 2020-09-22 | 2021-01-26 | 宝鸡钛业股份有限公司 | Processing method of large-scale hot-strength titanium alloy forging |
| CN112496216A (en) * | 2020-11-23 | 2021-03-16 | 浙江天马轴承集团有限公司 | Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN112536406A (en) * | 2020-11-25 | 2021-03-23 | 浙江天马轴承集团有限公司 | Forging drawing method for avoiding surface cracking |
| CN112893725A (en) * | 2020-12-29 | 2021-06-04 | 常州中钢精密锻材有限公司 | Method for improving surface quality of titanium alloy forging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109396311A (en) * | 2018-12-11 | 2019-03-01 | 陕西宏远航空锻造有限责任公司 | A kind of press machine titanium alloy beta forging molding forging method and device |
| 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 |
| CN111940654A (en) * | 2020-08-12 | 2020-11-17 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank |
| CN112264566A (en) * | 2020-09-22 | 2021-01-26 | 宝鸡钛业股份有限公司 | Processing method of large-scale hot-strength titanium alloy forging |
| CN112264566B (en) * | 2020-09-22 | 2023-08-01 | 宝鸡钛业股份有限公司 | Processing method of large heat-strength titanium alloy forging |
| CN112496216A (en) * | 2020-11-23 | 2021-03-16 | 浙江天马轴承集团有限公司 | Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN112536406A (en) * | 2020-11-25 | 2021-03-23 | 浙江天马轴承集团有限公司 | Forging drawing method for avoiding surface cracking |
| CN112893725A (en) * | 2020-12-29 | 2021-06-04 | 常州中钢精密锻材有限公司 | Method for improving surface quality of titanium alloy forging |
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