CN102921852B - Preparation method of Ti31 titanium alloy flange forge piece - Google Patents
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Abstract
The invention provides a preparation method of a Ti31 titanium alloy flange forge piece. The preparation method comprises the following steps: 1, peeling off a Ti31 titanium alloy casting ingot and then cutting off a dead head and an ingot base, polishing and removing surface defects; 2, drawing out and forging for a heating number under the condition that an initial forging temperature is 150-200 DEG C above a beta-phase transformation point; 3, upsetting, drawing and forging for 4-5 heating numbers under the condition that the initial forging temperature is 30-40 DEG C below the beta-phase transformation point; 4, drawing out and forging for one heating number under the condition that the initial forging temperature is 40-50 DEG C below the beta-phase transformation point; and 5, die-forming and shaping for one heating number under the condition that the initial forging temperature is 50-60 DEG C below the beta-phase transformation point so as to obtain the Ti31 titanium alloy flange forge piece. The preparation technique is simple, and easy to realize industrial production on a large scale; the Ti31 titanium alloy flange forge piece prepared by adopting the preparation method is uniform in structure, good in metal flow line, excellent in mechanical property and high in yield.
Description
Technical field
The invention belongs to titanium alloy material preparing technical field, be specifically related to a kind of preparation method of Ti31 titanium alloy flange forge piece.
Background technology
Ti31 titanium alloy be a kind of novel in strong corrosion resistant Ti alloy, the Ti-Al-Mo-Ni-Zr that belongs to low alloying is nearly alpha titanium alloy, wherein Al is main intensified element, Mo can improve stress corrosion resistant and the heat resistance of titanium alloy, Zr can improve the welding performance of titanium alloy, and Ni can improve the anti-crevice corrosion ability of titanium alloy.Ti31 titanium alloy concentrates equal strength, high-ductility, good processing and mouldability, excellent corrosion resistance, solderability in one, be made into the parts such as various shape flanges, reduced tee, base and valve, be widely used in boats and ships, chemical industry, ocean industry and civilian industry.
At present, the subject matter of forging the Ti31 forging existence of processing by routine is that unstable properties, tissue odds are even, lumber recovery is low, has seriously hindered the application and development of Ti31 titanium alloy.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of preparation technology simply, easily to realize the preparation method of the Ti31 titanium alloy flange forge piece of large-scale industrialization production.The Ti31 titanium alloy flange forge piece even tissue that adopts the method to prepare, metal streamline is good, and lumber recovery is high, and mechanical property is high.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of Ti31 titanium alloy flange forge piece, it is characterized in that, and the method comprises the following steps:
Step 1, Ti31 titanium alloy consumable electrode is carried out to vacuum consumable arc-melting three times, obtain Ti31 titan alloy casting ingot, at the bottom of cutting rising head and ingot after then Ti31 titan alloy casting ingot being stripped off the skin, and adopt the method for polishing to remove blemish;
Step 2, to adopt hydraulic press be that the first pulling of more than beta transformation point carrying out a fire time under the condition of 150 ℃～200 ℃ is forged by the Ti31 titan alloy casting ingot of removing blemish in step 1 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the first forging stock; The accumulative total deflection that described the first pulling is forged is 70%～90%;
Step 3, to adopt hydraulic press be that the upsetting pulls of carrying out 4～5 fire time under the condition of 30 ℃～40 ℃ below beta transformation point are forged by the first forging stock described in step 2 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the second forging stock; The forging ratio that time upsetting pull of every fire is forged is 4.0～5.0;
Step 4, to adopt hydraulic press be that the second pulling of carrying out a fire time under the condition of 40 ℃～50 ℃ below beta transformation point is forged by the second forging stock described in step 3 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the 3rd forging stock; The accumulative total deflection that described the second pulling is forged is 40%～70%;
Step 5, according to the shape and size of Ti31 titanium alloy flange forge piece to be prepared, select mould, the 3rd forging stock described in step 4 is packed in mould, then the mould that the 3rd forging stock is housed is put into hydraulic press, utilize hydraulic press the 3rd forging stock to be carried out to the die-forging forming of a fire time below for beta transformation point under the condition of 50 ℃～60 ℃ at initial forging temperature, after air cooling to 20 ℃ room temperature, obtain Ti31 titanium alloy flange forge piece; The accumulative total deflection of described die-forging forming is 40%～60%.
The preparation method of above-mentioned a kind of Ti31 titanium alloy flange forge piece, is characterized in that, the final forging temperature that described in step 2, the first pulling is forged is not less than 850 ℃.
The preparation method of above-mentioned a kind of Ti31 titanium alloy flange forge piece, is characterized in that, the final forging temperature that in step 3, time upsetting pull of every fire is forged is all not less than 750 ℃.
The preparation method of above-mentioned a kind of Ti31 titanium alloy flange forge piece, is characterized in that, the final forging temperature that described in step 4, the second pulling is forged is not less than 750 ℃.
The preparation method of above-mentioned a kind of Ti31 titanium alloy flange forge piece, is characterized in that, the final forging temperature of die-forging forming described in step 5 is not less than 750 ℃.
The preparation method of above-mentioned a kind of Ti31 titanium alloy flange forge piece, is characterized in that, the rated pressure of hydraulic press described in step 2 to five is 1250 tons～3150 tons.
The present invention compared with prior art has the following advantages:
1, preparation technology of the present invention is simple, easily realizes large-scale industrialization and produces; Product stability is good, and mechanical property is high.
2, to adopt rated pressure be that the large-tonnage hydraulic press of 1250 tons～3150 tons forges processing to Ti31 titan alloy casting ingot in the present invention, and at initial forging temperature, be the forging mode that adopts many fire time upsetting pulls to forge under the condition of 30 ℃～40 ℃ below beta transformation point, make Ti31 alloy grain obtain abundant fragmentation, made Ti31 alloy flange forge piece even tissue.
3, the hot strength >=650MPa of the Ti31 alloy flange forge piece that prepared by employing the present invention under room temperature (20 ℃) condition, yield strength >=550MPa, percentage elongation >=19%, the contraction percentage of area >=51%.
The allowance of the Ti31 titanium alloy flange forge piece that 4, prepared by employing the present invention is little, and lumber recovery is compared with traditional handicraft and improved 4%～5%, and macrostructure is good, and metal streamline is good, meets industry standard requirement.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Ti31 titanium alloy flange forge piece of the embodiment of the present invention 1 preparation.
Fig. 2 is the A-A cutaway view of Fig. 1.
The specific embodiment
Embodiment 1
The preparation method of the Ti31 titanium alloy flange forge piece of the present embodiment comprises the following steps:
Step 1, Ti31 titanium alloy consumable electrode is carried out to vacuum consumable smelting three times, obtaining diameter is the Ti31 titan alloy casting ingot of 540mm, at the bottom of cutting rising head and ingot, and adopts the method for polishing to remove blemish after then Ti31 titan alloy casting ingot being stripped off the skin;
Step 2, to adopt rated pressure be that the hydraulic press of 3150 tons is that the first pulling of more than beta transformation point carrying out a fire time under the condition of 200 ℃ is forged by the Ti31 titan alloy casting ingot of removing blemish in step 1 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the first forging stock; The deflection that described the first pulling is forged is that the final forging temperature that 70%, the first pulling is forged is 890 ℃;
Step 3, to adopt rated pressure be that the hydraulic press of 2500 tons is that the upsetting pulls of carrying out four fire time under the condition of 30 ℃～40 ℃ below beta transformation point are forged by the first forging stock described in step 2 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the second forging stock; The initial forging temperature that wherein the first fire time upsetting pull is forged is following 30 ℃ of beta transformation point, and forging ratio is 5.0, and final forging temperature is 770 ℃; The initial forging temperature that the second fire time upsetting pull is forged is following 35 ℃ of beta transformation point, and forging ratio is 4.8, and final forging temperature is 770 ℃; The initial forging temperature that the 3rd fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.5, and final forging temperature is 765 ℃; The initial forging temperature that the 4th fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.5, and final forging temperature is 760 ℃;
Step 4, to adopt rated pressure be that the hydraulic press of 1250 tons is that the second pulling of carrying out a fire time under the condition of 40 ℃ below beta transformation point is forged by the second forging stock described in step 3 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the 3rd forging stock; The accumulative total deflection that described the second pulling is forged is 40%, and final forging temperature is 760 ℃;
Step 5, according to the shape and size of Ti31 titanium alloy flange forge piece to be prepared, select mould, the 3rd forging stock described in step 4 is placed in to mould, then the mould that is placed with the 3rd forging stock is put into hydraulic press, utilizing rated pressure is the hydraulic press of 1250 tons carries out the 3rd forging stock under the condition of 60 ℃ below for beta transformation point one fire time die-forging forming at initial forging temperature, obtains Ti31 titanium alloy flange forge piece (as depicted in figs. 1 and 2) after air cooling to 20 ℃ room temperature; The accumulative total deflection of described die-forging forming is 40%, and final forging temperature is 758 ℃;
The macrostructure of the Ti31 titanium alloy flange forge piece of the present embodiment is rated B2 level according to GJB 2220-1994 Fig. 1, meets the grading regulation of B1～B8 level in international industry technology requirement; Mirco structure is rated B5 level according to GJB 2220-1994 Fig. 3, meets the grading regulation of B 1～B10 level in international industry technology requirement; Ultrasonic examination meets A grade standard requirement in GB 5193-85; Lumber recovery has improved 5% than traditional handicraft.The mechanical experimental results of the Ti31 titanium alloy flange forge piece of the present embodiment is in Table 1.
The mechanical experimental results of the Ti31 titanium alloy flange forge piece of table 1 embodiment of the present invention 1
As shown in Table 1, the hot strength R of the Ti31 titanium alloy flange forge piece of the present embodiment under room temperature (20 ℃) condition
m>=650MPa, yield strength R
p0.2>=550MPa, percentage elongation A
5>=19%, contraction percentage of area Z>=51%.The Ti31 titanium alloy flange forge piece good stability that the present embodiment is described, mechanical property is high.
Embodiment 2
The preparation method of the Ti31 titanium alloy flange forge piece of the present embodiment comprises the following steps:
Step 1, Ti31 titanium alloy consumable electrode is carried out to vacuum consumable arc-melting three times, obtaining diameter is the Ti31 titan alloy casting ingot of 690mm, at the bottom of cutting rising head and ingot, and adopts the method for polishing to remove blemish after then Ti31 titan alloy casting ingot being stripped off the skin;
Step 2, to adopt rated pressure be that the hydraulic press of 3150 tons is that the first pulling of more than beta transformation point carrying out a fire time under the condition of 200 ℃ is forged by the Ti31 titan alloy casting ingot of removing blemish in step 1 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the first forging stock; The deflection that described the first pulling is forged is that the final forging temperature that 90%, the first pulling is forged is 878 ℃;
Step 3, to adopt rated pressure be that the hydraulic press of 2500 tons is that the upsetting pulls of carrying out five fire time under the condition of 30 ℃～40 ℃ below beta transformation point are forged by the first forging stock described in step 2 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the second forging stock; The initial forging temperature that wherein the first fire time upsetting pull is forged is following 30 ℃ of beta transformation point, and forging ratio is 4.8, and final forging temperature is 775 ℃; The initial forging temperature that the second fire time upsetting pull is forged is following 30 ℃ of beta transformation point, and forging ratio is 4.6, and final forging temperature is 770 ℃; The initial forging temperature that the 3rd fire time upsetting pull is forged is following 35 ℃ of beta transformation point, and forging ratio is 4.5, and final forging temperature is 765 ℃; The initial forging temperature that the 4th fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.3, and final forging temperature is 760 ℃; The initial forging temperature that the 5th fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.0, and final forging temperature is 750 ℃;
Step 4, to adopt rated pressure be that the hydraulic press of 1250 tons is that the second pulling of carrying out a fire time under the condition of 40 ℃ below beta transformation point is forged by the second forging stock described in step 3 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the 3rd forging stock; The accumulative total deflection that described the second pulling is forged is 60%, and final forging temperature is 750 ℃; ;
Step 5, according to the shape and size of Ti31 titanium alloy flange forge piece to be prepared, select mould, the 3rd forging stock described in step 4 is placed in to mould, then the mould that is placed with the 3rd forging stock is put into hydraulic press, utilizing rated pressure is the hydraulic press of 1250 tons carries out the 3rd forging stock under the condition of 50 ℃ below for beta transformation point one fire time die-forging forming at initial forging temperature, obtains Ti31 titanium alloy flange forge piece after air cooling to 20 ℃ room temperature; The accumulative total deflection of described die-forging forming is 50%, and final forging temperature is 756 ℃;
The macrostructure of the Ti31 titanium alloy flange forge piece of the present embodiment is rated B3 level according to GJB 2220-1994 Fig. 1, meets the grading regulation of B 1～B8 level in international industry technology requirement; Mirco structure is rated B4 level according to GJB 2220-1994 Fig. 3, meets the grading regulation of 10 grades of B 1～B in international industry technology requirement; Ultrasonic examination meets A grade standard requirement in GB 5193-85; Lumber recovery has improved 4.5% than traditional handicraft.The mechanical experimental results of the Ti31 titanium alloy flange forge piece of the present embodiment is in Table 2.
The mechanical experimental results of the Ti31 titanium alloy flange forge piece of table 2 embodiment of the present invention 2
As shown in Table 2, the hot strength R of the Ti31 titanium alloy flange forge piece of the present embodiment under room temperature (20 ℃) condition
m>=650MPa, yield strength R
p0.2>=550MPa, percentage elongation A
5>=19%, contraction percentage of area Z>=51%.The Ti31 titanium alloy flange forge piece good stability that the present embodiment is described, mechanical property is high.
Embodiment 3
The preparation method of the Ti31 titanium alloy flange forge piece of the present embodiment comprises the following steps:
Step 1, Ti31 titanium alloy consumable electrode is carried out to vacuum consumable arc-melting three times, obtaining diameter is the Ti31 titan alloy casting ingot of 690mm, at the bottom of cutting rising head and ingot, and adopts the method for polishing to remove blemish after then Ti31 titan alloy casting ingot being stripped off the skin;
Step 2, to adopt rated pressure be that the hydraulic press of 3150 tons is that the first pulling of more than beta transformation point carrying out a fire time under the condition of 150 ℃ is forged by the Ti31 titan alloy casting ingot of removing blemish in step 1 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the first forging stock; The deflection that described the first pulling is forged is that the final forging temperature that 70%, the first pulling is forged is 886 ℃;
Step 3, to adopt rated pressure be that the hydraulic press of 2500 tons is that the upsetting pulls of carrying out five fire time under the condition of 30 ℃～40 ℃ below beta transformation point are forged by the first forging stock described in step 2 in temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the second forging stock; The initial forging temperature that wherein the first fire time upsetting pull is forged is following 30 ℃ of beta transformation point, and forging ratio is 4.8, and final forging temperature is 776 ℃; The initial forging temperature that the second fire time upsetting pull is forged is following 30 ℃ of beta transformation point, and forging ratio is 4.6, and final forging temperature is 768 ℃; The initial forging temperature that the 3rd fire time upsetting pull is forged is following 35 ℃ of beta transformation point, and forging ratio is 4.5, and final forging temperature is 764 ℃; The initial forging temperature that the 4th fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.3, and final forging temperature is 765 ℃; The initial forging temperature that the 5th fire time upsetting pull is forged is following 40 ℃ of beta transformation point, and forging ratio is 4.0, and final forging temperature is 758 ℃;
Step 4, to adopt rated pressure be that the hydraulic press of 1250 tons is that the second pulling of carrying out a fire time under the condition of 50 ℃ below beta transformation point is forged by the second forging stock described in step 3 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the 3rd forging stock; The accumulative total deflection that described the second pulling is forged is 70%, and final forging temperature is 755 ℃;
Step 5, according to the shape and size of Ti31 titanium alloy flange forge piece to be prepared, select mould, the 3rd forging stock described in step 4 is placed in to mould, then the mould that is placed with the 3rd forging stock is put into hydraulic press, utilizing rated pressure is the hydraulic press of 1250 tons carries out the 3rd forging stock under the condition of 60 ℃ below for beta transformation point one fire time die-forging forming at initial forging temperature, obtains Ti31 titanium alloy flange forge piece after air cooling to 20 ℃ room temperature; The accumulative total deflection of described die-forging forming is 60%, and final forging temperature is 750 ℃.
The macrostructure of the Ti31 titanium alloy flange forge piece of the present embodiment is rated B2 level according to GJB 2220-1994 Fig. 1, meets the grading regulation of B 1～B8 level in international industry technology requirement; Mirco structure is rated B4 level according to GJB 2220-1994 Fig. 3, meets the grading regulation of 10 grades of B1～B in international industry technology requirement; Ultrasonic examination meets A grade standard requirement in GB 5193-85; Lumber recovery has improved 4% than traditional handicraft.The mechanical experimental results of the Ti31 titanium alloy flange forge piece of the present embodiment is in Table 3.
The mechanical experimental results of the Ti31 titanium alloy flange forge piece of table 3 embodiment of the present invention 3
As shown in Table 3, the hot strength R of the Ti31 titanium alloy flange forge piece of the present embodiment under room temperature (20 ℃) condition
m>=650MPa, yield strength R
p0.2>=550MPa, percentage elongation A
5>=19%, contraction percentage of area Z>=51%.The Ti31 titanium alloy forging good stability that the present embodiment is described, mechanical property is high.
The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions.Every any simple modification of above embodiment being done according to invention technical spirit, change and equivalence change, and all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. a preparation method for Ti31 titanium alloy flange forge piece, is characterized in that, the method comprises the following steps:
Step 1, Ti31 titanium alloy consumable electrode is carried out to vacuum consumable arc-melting three times, obtain Ti31 titan alloy casting ingot, at the bottom of cutting rising head and ingot after then described Ti31 titan alloy casting ingot being stripped off the skin, and adopt the method for polishing to remove blemish;
Step 2, to adopt hydraulic press be that the first pulling of more than beta transformation point carrying out a fire time under the condition of 150 ℃～200 ℃ is forged by the Ti31 titan alloy casting ingot of removing blemish in step 1 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the first forging stock; The accumulative total deflection that described the first pulling is forged is 70%～90%; The rated pressure of described hydraulic press is 3150 tons;
Step 3, to adopt hydraulic press be that the upsetting pulls of carrying out 4～5 fire time under the condition of 30 ℃～40 ℃ below beta transformation point are forged by the first forging stock described in step 2 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the second forging stock; The forging ratio that time upsetting pull of every fire is forged is 4.0～5.0; The rated pressure of described hydraulic press is 3150 tons;
Step 4, to adopt hydraulic press be that the second pulling of carrying out a fire time under the condition of 40 ℃～50 ℃ below beta transformation point is forged by the second forging stock described in step 3 at initial forging temperature, after air cooling to 20 ℃ room temperature, adopt the method for polishing to remove blemish, obtain the 3rd forging stock; The accumulative total deflection that described the second pulling is forged is 40%～70%; The rated pressure of described hydraulic press is 3150 tons;
Step 5, according to the shape and size of Ti31 titanium alloy flange forge piece to be prepared, select mould, the 3rd forging stock described in step 4 is packed in mould, then the mould that the 3rd forging stock is housed is put into hydraulic press, utilize hydraulic press the 3rd forging stock to be carried out to the die-forging forming of a fire time below for beta transformation point under the condition of 50 ℃～60 ℃ at initial forging temperature, after air cooling to 20 ℃ room temperature, obtain Ti31 titanium alloy flange forge piece; The accumulative total deflection of described die-forging forming is 40%～60%; The rated pressure of described hydraulic press is 3150 tons.
2. the preparation method of a kind of Ti31 titanium alloy flange forge piece according to claim 1, is characterized in that, the final forging temperature that described in step 2, the first pulling is forged is not less than 850 ℃.
3. the preparation method of a kind of Ti31 titanium alloy flange forge piece according to claim 1, is characterized in that, the final forging temperature that in step 3, time upsetting pull of every fire is forged is all not less than 750 ℃.
4. the preparation method of a kind of Ti31 titanium alloy flange forge piece according to claim 1, is characterized in that, the final forging temperature that described in step 4, the second pulling is forged is not less than 750 ℃.
5. the preparation method of a kind of Ti31 titanium alloy flange forge piece according to claim 1, is characterized in that, the final forging temperature of die-forging forming described in step 5 is not less than 750 ℃.
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| CN103143660B (en) * | 2013-03-22 | 2015-01-14 | 西部钛业有限责任公司 | Preparation method of TC17 titanium alloy flat square section bar |
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| CN105215245B (en) * | 2015-10-16 | 2019-08-20 | 西安三角航空科技有限责任公司 | A kind of forging method of super large Type Titanium Alloy entirety frame forging |
| CN110076533B (en) * | 2019-05-24 | 2021-11-02 | 宝鸡拓普达钛业有限公司 | Preparation method of TC4 step shaft applied to petroleum lubricator |
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