CN103060733A - Method for preparing large-size TC2 titanium alloy bars - Google Patents
Method for preparing large-size TC2 titanium alloy bars Download PDFInfo
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Abstract
The invention provides a method for preparing large-size TC2 titanium alloy bars. The method comprises the following steps: firstly, cutting the riser head and the ingot bottom of a TC2 titanium alloy ingot, and removing the surface defects of the TC2 titanium alloy ingot; secondly, carrying out cogging and forging to obtain a primary forged blank; thirdly, carrying out intermediate forging to the primary forged blank to obtain a semifinished forged blank; and fourthly, carrying out forming forging to the semifinished forged blank to obtain the large-size TC2 titanium alloy bars with cross section diameter of 200-300 mm and length of 2000-3000 mm. The large-size TC2 titanium alloy bars are prepared through small and medium forging hydraulic presses, and through selecting and optimizing of the technological parameters such as forging temperature and forging ratio, the prepared large-size TC2 titanium alloy bars are uniform in microscopic structure, excellent in mechanical properties and good in stability from batch to batch, and can be widely applied to various fields, and the quality of the product can be matched with that of the bars forged through a large forging press.
Description
Technical field
The invention belongs to the titanium alloy material preparing technical field, be specifically related to a kind of preparation method of TC2 titanium alloy large size bar.
Background technology
The TC2 titanium alloy is that the Ti-Al-Mn of low alloying is nearly alpha titanium alloy, and the nominal composition of this alloy is Ti-4Al-1.5Mn, has the major advantages such as specific tenacity height, Heat stability is good, day by day is used widely in the Aeronautics and Astronautics field.
For obtaining colory TC2 titanium alloy large size bar, present most factories adopt expensive rated pressure in the large-scale forging equipment production more than 3000 tons, and not only equipment investment is large, and production cost is high; If adopt conventional preparation technology, the large scale rod bar such as forging TC2 titanium alloy on the middle-size and small-size forging hydraulic efficiency installation of rated pressure below 2100 tons, because of the forging force deficiency, forging property is poor, and the serious quality problems such as microstructure is inhomogeneous, the flaw detection clutter is not up to standard, bad mechanical property often appear in the TC2 titanium alloy large size bar of preparation.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of preparation method of TC2 titanium alloy large size bar of remarkable reduction forging equipment cost is provided.The method employing rated pressure is that 1700 tons ~ 2100 tons middle-size and small-size hydraulic forging press prepares TC2 titanium alloy large size bar, by setting the processing parameter of suitable forging temperature and coupling, the TC2 titanium alloy large size bar microstructure of preparation is even, mechanical property is good, batch good stability, quality product can compare favourably with the TC2 titanium alloy large size bar that adopts the forging of large-sized forging hydropress, can significantly reduce the forging equipment cost, is widely used in the fields such as Aeronautics and Astronautics.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of TC2 titanium alloy large size bar is characterized in that the method may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC2 titan alloy casting ingot, and the surface imperfection of removal TC2 titan alloy casting ingot; The cross section of described TC2 titan alloy casting ingot is that diameter is the circle of Φ 600mm ~ Φ 700mm;
Step 2, to adopt rated pressure be that 1700 tons ~ 2100 tons hydraulic forging press carries out cogging and forges removing TC2 titan alloy casting ingot after the surface imperfection in the step 1, obtains elementary forging stock after the cooling; The forging mode that adopts axially repeatedly jumping-up and pulling is forged in described cogging, is divided into 3 ~ 5 fire and finishes, all more than beta transformation point 50 ℃ ~ 100 ℃ of the initial forging temperatures that time cogging of every fire is forged; Total forging ratio that described cogging is forged is 15.6 ~ 97.7;
Step 3, employing rated pressure are that 1700 tons ~ 2100 tons hydraulic forging press carries out the centre forging to elementary forging stock described in the step 2, obtain the work in-process forging stock after the cooling; Forge to adopt axially repeatedly the forging mode of jumping-up and pulling in the middle of described, be divided into 3 ~ 5 fire and finish, all below beta transformation point 10 ℃ ~ 30 ℃ of the initial forging temperatures that forges in the middle of every fire time; Total forging ratio of forging in the middle of described is 15.6 ~ 97.7;
Step 4, the forging stock of work in-process described in the step 3 is carried out sawing, then adopting rated pressure is that 1700 tons ~ 2100 tons the hydraulic forging press work in-process forging stock after to sawing forms forging, obtaining diameter of section after the cooling is Φ 200mm ~ Φ 300mm, and length is the TC2 titanium alloy large size bar of 2000mm ~ 3000mm; Described one-tenth shape forging is divided into 2 ~ 4 fire and finishes, all below beta transformation point 30 ℃ ~ 80 ℃ of the initial forging temperatures that every fire time becomes shape forging, wherein last fire becomes shape forging to adopt the round as a ball forging mode of chamfered edge, and its ember becomes shape forging all to adopt the forging mode of axial pulling; Total forging ratio of described one-tenth shape forging is 2.20 ~ 4.87.
The preparation method of above-mentioned a kind of TC2 titanium alloy large size bar, it is characterized in that, the quality percentage composition of aluminium is 4.0% ~ 5.0% in the titan alloy casting ingot of TC2 described in the step 1, the quality percentage composition of manganese is 1.0% ~ 2.0%, the quality percentage composition of oxygen is 0.08% ~ 0.12%, and surplus is titanium and inevitable impurity.
The preparation method of above-mentioned a kind of TC2 titanium alloy large size bar; it is characterized in that; the titan alloy casting ingot of TC2 described in the step 1 is obtained through twice consumable arc-melting by the TC2 titanium alloy consumable electrode; wherein consumable arc-melting carries out under vacuum condition for the first time, and consumable arc-melting carries out under protection of inert gas for the second time.
The preparation method of above-mentioned a kind of TC2 titanium alloy large size bar is characterized in that, the forging ratio that time cogging of every fire is forged in the step 2 is 2.5, and the final forging temperature that time cogging of every fire is forged all is not less than 850 ℃, and the mode of cooling after the cogging forging is air cooling.
The preparation method of above-mentioned a kind of TC2 titanium alloy large size bar is characterized in that, the forging ratio of every fire time middle forging is 2.5 in the step 3, and every fire time middle final forging temperature of forging all is not less than 850 ℃, and the mode of cooling off after the forging of centre is water-cooled.
The preparation method of above-mentioned a kind of TC2 titanium alloy large size bar, it is characterized in that, every fire becomes the forging ratio of shape forging to be 1.48 ~ 1.50 in the step 4, and every fire becomes the final forging temperature of shape forging all to be not less than 800 ℃, and the mode of cooling off behind the one-tenth shape forging is air cooling.
The present invention compared with prior art has the following advantages:
1, the forging temperature overall control that the present invention forges stage and middle forging stage with cogging below the beta transformation point of TC2 titanium alloy 30 ℃ to 100 ℃ temperature range more than the transformation temperature, total forging ratio of forging by the control cogging and the ratio that becomes the total forging ratio of shape forging are greater than 3, and centre total forging ratio of forging and the ratio that becomes the total forging ratio of shape forging are greater than 3, and take full advantage of the TC2 titanium alloy near beta transformation point in the temperature range flow of metal stress low, the characteristic that forging property is good, thereby effectively reduced the requirement of forging TC2 titanium alloy large size bar to the forging equipment rated pressure, forging force can reduce more than 1/3rd; The present invention can significantly reduce equipment investment, reduces significantly the production cost of suitability for industrialized production TC2 titanium alloy large size bar.
2, the present invention adopts and carries out the preparation of large scale rod bar through the TC2 of twice consumable arc-melting titan alloy casting ingot; wherein for the first time melting is vacuum consumable smelting; take for the second time that consumable smelting carries out remelting under the protection of inert gas; can effectively avoid the higher volatilization of Mn element in fusion process of saturation vapour pressure; can prevent that again some impurity elements from forming the defectives such as pore in ingot casting, can guarantee argon filling fusion process arc stability.
3, the present invention finds after deliberation, and the setting of the forging process of TC2 titanium alloy large size bar and TC2 titan alloy casting ingot chemical ingredients has the property of being closely related; For being Φ 200mm such as diameter, length be 2000mm than small dimension TC2 titanium alloy rod bar, the quality percentage composition of aluminium is chosen lower limit composition range 4.0% ~ 4.5% in the chemical ingredients of TC2 titan alloy casting ingot, the quality percentage composition of manganese is chosen lower limit composition range 1.0% ~ 1.5%, when the quality percentage composition of oxygen is chosen lower limit composition range 0.08% ~ 0.10%, total forging ratio that then cogging is forged and forge the centre all is preferably 15.6 ~ 39.1, become the forging ratio of shape forging to be preferably 2.21 ~ 3.28, can access high-quality TC2 titanium alloy large size rod; And for being Φ 300mm such as diameter, length is the TC2 titanium alloy rod bar of the larger specification of 3000mm, the quality percentage composition of aluminium is chosen middle upper limit composition range 4.5% ~ 5.0% in the chemical ingredients of TC2 titan alloy casting ingot, the quality percentage composition of manganese is chosen middle upper limit composition range 1.5% ~ 2.0%, when the quality percentage composition of oxygen is chosen middle upper limit composition range 0.10% ~ 0.12%, total forging ratio that then cogging is forged and forge the centre all is preferably 39.1 ~ 97.7, become total forging ratio of shape forging to be preferably 3.28 ~ 4.90, can access high-quality TC2 titanium alloy large size bar.
4, the inventive method technique is simple, adopt the TC2 titanium alloy large size bar microstructure of the present invention's preparation even, mechanical property is good, batch good stability, quality product can compare favourably with the quality product of the titanium alloy large size bars such as TC2 that adopt super large forging press to forge, can be widely used in the fields such as Aeronautics and Astronautics, the lumber recovery of product also more common preparation method can improve more than 10%.
5, the tensile strength of TC2 titanium alloy large size bar under room temperature (20 ℃) condition that adopts the present invention's preparation be up to 830MPa ~ 840MPa, and yield strength is up to 760MPa ~ 800MPa, unit elongation 〉=16%, relative reduction in area 〉=38%; Impelling strength (a of U-shaped breach
KU) 〉=40J/cm
2Tensile strength under high temperature (350 ℃) condition is up to 550MPa ~ 560MPa; UT (Ultrasonic Testing) meets A grade standard requirement among the standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis ".
6, the inventive method also is applicable to the nearly alpha titanium alloy of other trade mark, the suitability for industrialized production of a+ β diphasic titanium alloy large scale rod bar, is with a wide range of applications.
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment
Embodiment 1
The preparation method of present embodiment TC2 titanium alloy large size bar may further comprise the steps:
Step 1, first consumable smelting is once under vacuum condition with the TC2 titanium alloy consumable electrode, consumable smelting is once under protection of inert gas again, obtaining diameter of section is the TC2 titan alloy casting ingot of Φ 600mm, then excise at the bottom of the rising head and ingot of TC2 titan alloy casting ingot, and remove the surface imperfection of TC2 titan alloy casting ingot; The quality percentage composition of aluminium is 4.0% in the described TC2 titan alloy casting ingot, and the quality percentage composition of manganese is 1.0%, and the quality percentage composition of oxygen is 0.08%, and surplus is titanium and inevitable impurity;
Step 2, employing rated pressure are that 1700 tons hydraulic forging press carries out the inferior coggings forging of 3 fire with the TC2 titan alloy casting ingot of removing surface imperfection in the step 1, obtain elementary forging stock behind the air cooling; The forging mode that adopts axially repeatedly jumping-up and pulling is forged in described cogging, and total forging ratio is 15.6; Wherein to forge all at initial forging temperature be to carry out under 60 ℃ the condition more than the beta transformation point in the cogging of the first fire time and the second fire time, and forging ratio is 2.5, and final forging temperature is 880 ℃; It is to carry out under 50 ℃ the condition more than the beta transformation point that the 3rd fire time cogging is forged at initial forging temperature, and forging ratio is 2.5, and final forging temperature is 870 ℃;
Step 3, employing rated pressure are that 1700 tons hydraulic forging press carries out inferior middle forging of 3 fire with elementary forging stock described in the step 2, obtain the work in-process forging stock after the water-cooled; Forge the forging mode that adopts axially repeatedly jumping-up and pulling in the middle of described, total forging ratio is 15.6; Wherein the first fire time and the second fire time in the middle of to forge all at initial forging temperature be to carry out under 20 ℃ the condition below the beta transformation point, forging ratio is 2.5, final forging temperature is 860 ℃, forging in the middle of the 3rd fire time at initial forging temperature is to forge under 30 ℃ the condition below the beta transformation point, forging ratio is 2.5, and final forging temperature is 850 ℃;
Step 4, the forging stock of work in-process described in the step 3 is carried out sawing, then adopting rated pressure is the one-tenth shape forgings that 1700 tons the hydraulic forging press work in-process forging stock after with sawing carries out 2 fire time, obtaining diameter of section behind the air cooling is Φ 200mm, and length is the TC2 titanium alloy large size bar of 2000mm; Total forging ratio of described one-tenth shape forging is that 2.205, the first fire become shape forgings axially to pull out under 30 ℃ condition below the initial forging temperature beta transformation point, and forging ratio is 1.48, and final forging temperature is 850 ℃; It is round as a ball that the second fire becomes shape forging to carry out chamfered edge under 50 ℃ condition below the initial forging temperature beta transformation point, and forging ratio is 1.49, and final forging temperature is 830 ℃.
Adopt the tensile strength of TC2 titanium alloy large size bar under room temperature (20 ℃) condition of present embodiment preparation up to 830MPa ~ 840MPa, yield strength is up to 760MPa ~ 800MPa, unit elongation 〉=16%, relative reduction in area 〉=38%, the impelling strength (a of U-shaped breach
KU) 〉=40J/cm
2Tensile strength under high temperature (350 ℃) condition is up to 550MPa ~ 560MPa; UT (Ultrasonic Testing) meets A grade standard requirement among the standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis "; Explanation adopts the TC2 titanium alloy large size bar microstructure of present embodiment preparation even thus, and mechanical property is good.
Embodiment 2
The preparation method of present embodiment TC2 titanium alloy large size bar may further comprise the steps:
Step 1, first melting is once under vacuum condition with the TC2 titanium alloy consumable electrode, consumable smelting is once under protection of inert gas again, obtaining diameter of section is the TC2 titan alloy casting ingot of Φ 650mm, then excise at the bottom of the rising head and ingot of TC2 titan alloy casting ingot, and remove the surface imperfection of TC2 titan alloy casting ingot; The quality percentage composition of aluminium is 4.5% in the described TC2 titan alloy casting ingot, and the quality percentage composition of manganese is 1.5%, and the quality percentage composition of oxygen is 0.10%, and surplus is titanium and inevitable impurity;
Step 2, employing rated pressure are that 1900 tons hydraulic forging press carries out the inferior coggings forging of 4 fire with the TC2 titan alloy casting ingot of removing surface imperfection in the step 1, obtain elementary forging stock behind the air cooling; The forging mode that adopts axially repeatedly jumping-up and pulling is forged in described cogging, and total forging ratio is 39.1; Wherein to forge all at initial forging temperature be to carry out under 80 ℃ the condition more than the beta transformation point in the cogging of the first fire time and the second fire time, and forging ratio is 2.5, and final forging temperature is 890 ℃; It is to carry out under 70 ℃ the condition more than the beta transformation point that the cogging of the 3rd fire time and the 4th fire time is forged all at initial forging temperature, and forging ratio is 2.5, and final forging temperature is 880 ℃;
Step 3, employing rated pressure are that 1900 tons hydraulic forging press carries out inferior middle forging of 4 fire with elementary forging stock described in the step 2, obtain the work in-process forging stock after the water-cooled; Forge the forging mode that adopts axially repeatedly jumping-up and pulling in the middle of described, total forging ratio is 39.1; Wherein the first fire time and the second fire time in the middle of to forge all at initial forging temperature be to carry out under 15 ℃ the condition below the beta transformation point, forging ratio is 2.5, final forging temperature is 870 ℃, forging in the middle of the 3rd fire time and the 4th fire time all at initial forging temperature is to carry out under 20 ℃ the condition below the beta transformation point, forging ratio is 2.5, and final forging temperature is 850 ℃;
Step 4, the forging stock of work in-process described in the step 3 is carried out sawing, then adopting rated pressure is the one-tenth shape forgings that 1900 tons the hydraulic forging press work in-process forging stock after with sawing carries out 3 fire time, obtaining diameter of section behind the air cooling is Φ 250mm, and length is the TC2 titanium alloy large size bar of 2700mm; Total forging ratio of described one-tenth shape forging is 3.28, wherein the first fire time and the second fire are inferior, and to become shape forging be axially to pull out under 40 ℃ the condition below the beta transformation point at initial forging temperature all, forging ratio is 1.48, final forging temperature is 840 ℃, the one-tenth shape forging of the 3rd fire time is that to carry out chamfered edge under 60 ℃ the condition below the beta transformation point round as a ball at initial forging temperature, forging ratio is 1.50, and final forging temperature is 820 ℃.
Adopt the tensile strength of TC2 titanium alloy large size bar under room temperature (20 ℃) condition of present embodiment preparation up to 830MPa ~ 840MPa, yield strength is up to 760MPa ~ 800MPa, unit elongation 〉=16%, relative reduction in area 〉=38%, the impelling strength (a of U-shaped breach
KU) 〉=40J/cm
2Tensile strength under high temperature (350 ℃) condition is up to 550MPa ~ 560MPa; UT (Ultrasonic Testing) meets A grade standard requirement among the standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis "; Explanation adopts the TC2 titanium alloy large size bar microstructure of present embodiment preparation even thus, and mechanical property is good.
Embodiment 3
The preparation method of present embodiment TC2 titanium alloy large size bar may further comprise the steps:
Step 1, first melting is once under vacuum condition with the TC2 titanium alloy consumable electrode, consumable smelting is once under protection of inert gas again, obtaining diameter of section is the TC2 titan alloy casting ingot of Φ 700mm, then excise at the bottom of the rising head and ingot of TC2 titan alloy casting ingot, and remove the surface imperfection of TC2 titan alloy casting ingot; The quality percentage composition of aluminium is 5.0% in the described TC2 titan alloy casting ingot, and the quality percentage composition of manganese is 2.0%, and the quality percentage composition of oxygen is 0.12%, and surplus is titanium and inevitable impurity;
Step 2, employing rated pressure are that 2100 tons hydraulic forging press carries out the inferior coggings forging of 5 fire with the TC2 titan alloy casting ingot of removing surface imperfection in the step 1, obtain elementary forging stock behind the air cooling; The forging mode that adopts axially repeatedly jumping-up and pulling is forged in described cogging, and total forging ratio is 97.7; Wherein to forge all at initial forging temperature be to carry out under 100 ℃ the condition more than the beta transformation point in the cogging of the first fire time and the second fire time, forging ratio is 2.5, final forging temperature is 900 ℃, it is to carry out under 90 ℃ the condition more than the beta transformation point that the cogging of the 3rd fire time and the 4th fire time is forged all at initial forging temperature, forging ratio is 2.5, and final forging temperature is 880 ℃, and it is to carry out under 70 ℃ the condition more than the beta transformation point that the 5th fire time cogging is forged at initial forging temperature, forging ratio is 2.5, and final forging temperature is 850 ℃;
Step 3, employing rated pressure are that 2100 tons hydraulic forging press carries out inferior middle forging of 5 fire with elementary forging stock described in the step 2, obtain the work in-process forging stock after the water-cooled; Forge the forging mode that adopts axially repeatedly jumping-up and pulling in the middle of described, total forging ratio is 97.7; Wherein the first fire time and the second fire time in the middle of to forge all at initial forging temperature be to carry out under 10 ℃ the condition below the beta transformation point, forging ratio is 2.5, final forging temperature is 870 ℃, forging in the middle of the 3rd fire time and the 4th fire time all at initial forging temperature is to carry out under 20 ℃ the condition below the beta transformation point, forging ratio is 2.5, and final forging temperature is 860 ℃; Forging in the middle of the 5th fire time at initial forging temperature is to carry out under 30 ℃ the condition below the beta transformation point, and forging ratio is 2.5, and final forging temperature is 850 ℃;
Step 4, the forging stock of work in-process described in the step 3 is carried out sawing, then adopting rated pressure is the one-tenth shape forgings that 2100 tons the hydraulic forging press work in-process forging stock after with sawing carries out 4 fire time, obtaining diameter of section behind the air cooling is Φ 300mm, and length is the TC2 titanium alloy large size bar of 3000mm; Total forging ratio of described one-tenth shape forging is 4.87; Wherein the shape forging that becomes of the first fire, the second fire time and the 3rd fire time is axially to pull out under 50 ℃ the condition below the beta transformation point at initial forging temperature all, forging ratio is 1.48, final forging temperature is 830 ℃, the one-tenth shape forging of the 4th fire time is that to carry out chamfered edge under 80 ℃ the condition below the beta transformation point round as a ball at initial forging temperature, forging ratio is 1.50, and final forging temperature is 800 ℃.
Adopt the tensile strength of TC2 titanium alloy large size bar under room temperature (20 ℃) condition of present embodiment preparation up to 830MPa ~ 840MPa, yield strength is up to 760MPa ~ 800MPa, unit elongation 〉=16%, relative reduction in area 〉=38%, the impelling strength (a of U-shaped breach
KU) 〉=40J/cm
2Tensile strength under high temperature (350 ℃) condition is up to 550MPa ~ 560MPa; UT (Ultrasonic Testing) meets A grade standard requirement among the standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis "; Explanation adopts the TC2 titanium alloy large size bar microstructure of present embodiment preparation even thus, and mechanical property is good.
The above only is preferred embodiment of the present invention, is not that the present invention is imposed any restrictions.Every any simple modification, change and equivalence of above embodiment being done according to the invention technical spirit changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (6)
1. the preparation method of a TC2 titanium alloy large size bar is characterized in that the method may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC2 titan alloy casting ingot, and the surface imperfection of removal TC2 titan alloy casting ingot; The cross section of described TC2 titan alloy casting ingot is that diameter is the circle of Φ 600mm ~ Φ 700mm;
Step 2, to adopt rated pressure be that 1700 tons ~ 2100 tons hydraulic forging press carries out cogging and forges removing TC2 titan alloy casting ingot after the surface imperfection in the step 1, obtains elementary forging stock after the cooling; The forging mode that adopts axially repeatedly jumping-up and pulling is forged in described cogging, is divided into 3 ~ 5 fire and finishes, all more than beta transformation point 50 ℃ ~ 100 ℃ of the initial forging temperatures that time cogging of every fire is forged; Total forging ratio that described cogging is forged is 15.6 ~ 97.7;
Step 3, employing rated pressure are that 1700 tons ~ 2100 tons hydraulic forging press carries out the centre forging to elementary forging stock described in the step 2, obtain the work in-process forging stock after the cooling; Forge to adopt axially repeatedly the forging mode of jumping-up and pulling in the middle of described, be divided into 3 ~ 5 fire and finish, all below beta transformation point 10 ℃ ~ 30 ℃ of the initial forging temperatures that forges in the middle of every fire time; Total forging ratio of forging in the middle of described is 15.6 ~ 97.7;
Step 4, the forging stock of work in-process described in the step 3 is carried out sawing, then adopting rated pressure is that 1700 tons ~ 2100 tons the hydraulic forging press work in-process forging stock after to sawing forms forging, obtaining diameter of section after the cooling is Φ 200mm ~ Φ 300mm, and length is the TC2 titanium alloy large size bar of 2000mm ~ 3000mm; Described one-tenth shape forging is divided into 2 ~ 4 fire and finishes, all below beta transformation point 30 ℃ ~ 80 ℃ of the initial forging temperatures that every fire time becomes shape forging, wherein last fire becomes shape forging to adopt the round as a ball forging mode of chamfered edge, and its ember becomes shape forging all to adopt the forging mode of axial pulling; Total forging ratio of described one-tenth shape forging is 2.20 ~ 4.87.
2. the preparation method of a kind of TC2 titanium alloy large size bar according to claim 1, it is characterized in that, the quality percentage composition of aluminium is 4.0% ~ 5.0% in the titan alloy casting ingot of TC2 described in the step 1, the quality percentage composition of manganese is 1.0% ~ 2.0%, the quality percentage composition of oxygen is 0.08% ~ 0.12%, and surplus is titanium and inevitable impurity.
3. the preparation method of a kind of TC2 titanium alloy large size bar according to claim 1; it is characterized in that; the titan alloy casting ingot of TC2 described in the step 1 is obtained through twice consumable arc-melting by the TC2 titanium alloy consumable electrode; wherein consumable arc-melting carries out under vacuum condition for the first time, and consumable arc-melting carries out under protection of inert gas for the second time.
4. the preparation method of a kind of TC2 titanium alloy large size bar according to claim 1, it is characterized in that, the forging ratio that time cogging of every fire is forged in the step 2 is 2.5, and the final forging temperature that time cogging of every fire is forged all is not less than 850 ℃, and the mode of cooling after the cogging forging is air cooling.
5. the preparation method of a kind of TC2 titanium alloy large size bar according to claim 1, it is characterized in that, the forging ratio of every fire time middle forging is 2.5 in the step 3, and every fire time middle final forging temperature of forging all is not less than 850 ℃, and the mode of cooling off after the forging of centre is water-cooled.
6. the preparation method of a kind of TC2 titanium alloy large size bar according to claim 1, it is characterized in that, every fire becomes the forging ratio of shape forging to be 1.48 ~ 1.50 in the step 4, and every fire becomes the final forging temperature of shape forging all to be not less than 800 ℃, and the mode of cooling off behind the one-tenth shape forging is air cooling.
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| CN104762576A (en) * | 2015-04-24 | 2015-07-08 | 西北有色金属研究院 | Method for manufacturing TC18 titanium alloy whole basket-weave microstructure medium-specification ultra-long bars |
| CN104762576B (en) * | 2015-04-24 | 2016-10-12 | 西北有色金属研究院 | The preparation method of TC18 titanium alloy the whole network basket tissue medium format overlength bar |
| CN106392490A (en) * | 2016-11-15 | 2017-02-15 | 宝鸡钛业股份有限公司 | Machining method for large-sized fine-grained pure-titanium bar |
| CN106734796A (en) * | 2016-12-14 | 2017-05-31 | 西部超导材料科技股份有限公司 | The engine forging method of high temperature resistant titanium alloy large scale rod bar |
| CN106734796B (en) * | 2016-12-14 | 2018-11-06 | 西部超导材料科技股份有限公司 | The forging method of engine high temperature resistant titanium alloy large scale rod bar |
| CN110983079A (en) * | 2019-12-18 | 2020-04-10 | 西安西工大超晶科技发展有限责任公司 | Preparation method of titanium alloy ingot containing volatile elements |
| CN111809080A (en) * | 2020-06-23 | 2020-10-23 | 中国科学院金属研究所 | Preparation method of TC2 alloy thin-wall extruded section |
| CN111809080B (en) * | 2020-06-23 | 2022-07-26 | 中国科学院金属研究所 | Preparation method of TC2 alloy thin-wall extruded section |
| CN112719179A (en) * | 2020-12-16 | 2021-04-30 | 西部超导材料科技股份有限公司 | Forging method of TC1 titanium alloy bar |
| CN112719179B (en) * | 2020-12-16 | 2023-02-28 | 西部超导材料科技股份有限公司 | Forging method of TC1 titanium alloy bar |
| CN112756909A (en) * | 2020-12-24 | 2021-05-07 | 西安稀有金属材料研究院有限公司 | Preparation method of large-caliber Ti35 titanium alloy pipe |
| CN113755709A (en) * | 2021-09-10 | 2021-12-07 | 西北有色金属研究院 | Preparation method of Ti80 titanium alloy bar with high impact toughness |
| CN113755709B (en) * | 2021-09-10 | 2022-06-24 | 西北有色金属研究院 | Preparation method of Ti80 titanium alloy bar with high impact toughness |
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