CN103071743A - Preparation method for TC11 titanium alloy small-bore thick-walled cylindrical part - Google Patents
Preparation method for TC11 titanium alloy small-bore thick-walled cylindrical part Download PDFInfo
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Abstract
The invention provides a preparation method for a TC11 titanium alloy small-bore thick-walled cylindrical part. The preparation method comprises the following steps of: I, cutting off a dead head and an ingot bottom of a TC11 titanium alloy cast ingot, and removing surface defects; II, performing cogging forging on the TC11 titanium alloy cast ingot to obtain a primary forging blank; III, performing intermediate forging on the primary forging blank to obtain an intermediate forging blank; IV, performing forming forging after sawing the intermediate forging blank to obtain a semi-finished cylindrical part through punching and reforming; and V, and performing annealing treatment on the semi-finished cylindrical part to obtain the TC11 titanium alloy small-bore thick-walled cylindrical part. The preparation process for the preparation method provided by the invention is simple, and stable large-scale industrial production can be realized only by means of a common forging press. By adopting the preparation method provided by the invention, according to different physical characteristics of TC11 titanium alloy at all forging stages, forging processing is performed by adopting different forging modes and strain rates, and thus, the prepared TC11 titanium alloy small-bore thick-walled cylindrical part is good in isotropy and excellent in overall performance.
Description
Technical field
The invention belongs to the titanium alloy material preparing technical field, be specifically related to the preparation method of a kind of TC11 titanium alloy small-bore thick walled cylinder parts.
Background technology
TC11 alloy, its nominal composition are Ti-6.5 Α l-3.5Mo-1.5Zr-0.3Si, belong to martensite type (alpha+beta) two-phase thermal strength titanium alloy, can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).These two kinds of vulnerable components that the titanium structural member is airplane wheel are risen and fallen for guaranteeing aircraft safety, and aircraft flight necessarily rises and falls just to be needed behind the number of times in time to change, so demand is larger.
The mode that domestic certain factory once adopted open die forging to combine with backward extrusion is manufactured experimently out the TC11 titanium alloy small-bore thick walled cylinder parts for this product, but it is very limited only to finish small lot trial-production and production capacity, and need the production of large-tonnage extruder, domestic most forge plant can't be produced because of this appointed condition of tool not, at present brake housing and cushion disk(-sc) still need import in enormous quantities in every year, hindered to a certain extent the development of China's Aviation Industry, if can be at common forging press, even on middle-size and small-size forcing press, just can realize batch production, will significantly alleviate this imbalance between supply and demand.
Yet, if current technology is abandoned the mode that adopts backward extrusion and open die forging to combine, and prepare the small-bore thick walled cylinder parts according to the method for conventional open die forging, remain in following technical bottleneck: one, wall thickness 〉=130mm when cylindrical member, high 〉=the 300mm of cylinder, during endoporus aperture≤100mm, owing to the rate request of forging in the rear cooling procedure and its cooling velocity of metal of barrel middle part can not satisfy air cooling in the cooling procedure of dual heat treatment phase I of forging, the secondaryαphase that β produces mutually in the metal microstructure and the steady β of Jie of retention phase composition mutually, distribution all has been different from as air-cooled condition too slowly because of cooling velocity, make 500 ℃ of high-temperature instantaneous hot strengths and 500 ℃ of high temperature endurance performances of cylindrical member poor, can not reach standard-required; Two, the isotropism of small-bore thick cylinder shape Forging performance is poor, has seriously limited the application and development of small-bore thick cylinder shape Forging; Three, mostly adopt at present expensive rated pressure to prepare cylindrical member at the large-scale extrusion equipment more than 3150 tons, cause production cost higher.Have technique now and adopt, cylindrical member in rated pressure forging on the middle-size and small-size forging hydraulic test below 2100 tons, because forging force is not enough, forging property is poor, and the serious quality problems such as microscopic structure is inhomogeneous, the flaw detection clutter is not up to standard often appear in the TC11 titanium alloy cylindrical forging of preparation.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, but a kind of preparation technology is provided the simply preparation method of the TC11 titanium alloy small-bore thick walled cylinder parts of large-scale industrial production.The method is forged the physical property characteristics in stage according to the TC11 titanium alloy at each, blank link in the middle of forging, take to pull out to flat side's forging mode increasing horizontal stroke, longitudinal deformation amount, the crystallite dimension of semi-finished product circle base is controlled at 1mm ~ 3mm; By effectively controlling technological parameter and the types of cooling such as deflection that nearly β forges, deformation temperature, rate of deformation, α granule content in the finished product barrier part microscopic structure of hot-working attitude is controlled in 20 ~ 40% scopes, and the α granule content is controlled in 10% ~ 30% scope in the finished product forging microscopic structure after the heat treatment.The isotropism of the TC11 titanium alloy small-bore thick walled cylinder parts of employing the method preparation is good, and high comprehensive performance can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
For solving the problems of the technologies described above, the technical solution used in the present invention is: the preparation method of a kind of TC11 titanium alloy small-bore thick walled cylinder parts, it is characterized in that, and the method may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and the blemish of removal TC11 titan alloy casting ingot; The cross section of described TC11 titan alloy casting ingot is that diameter is the circle of 640mm ~ 720mm;
Step 2, adopt forging press to carry out cogging and forge removing TC11 titan alloy casting ingot after the blemish in the step 1, obtain elementary forging stock behind the air cooling; Described cogging is forged and is adopted the axially forging mode of pulling, is divided into two fire and finishes, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃ ~ 150 ℃ of beta transformation point, and the cross section of described elementary forging stock is that the length of side is the square of 300mm ~ 400mm;
Step 3, employing forging press carry out the centre with elementary forging stock described in the step 2 and forge forging stock in the middle of obtaining after the water-cooled; Forge in the middle of described and be divided into 3 ~ 5 fiery inferior finishing, every fire time middle initial forging temperature that forges is following 10 ℃ ~ 30 ℃ of beta transformation point, wherein the round as a ball forging mode of chamfered edge is adopted in the inferior middle forging of last fire, the inferior middle forging of all the other each fire is all adopted and is axially pulled out extremely flat side's forging mode, and the cross section of described middle forging stock is that diameter is the circle of 180mm ~ 300mm;
Step 4, with forging stock sawing in the middle of described in the step 3, then the middle forging stock after adopting forging press with sawing forms forging, to become at last the middle forging stock behind the shape forging to carry out successively punching processing and Shape correction, obtain the semi-finished product cylindrical member after the water-cooled; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 1 ~ 3 fire finishes, every fire becomes the initial forging temperature of shape forging to be following 30 ℃ ~ 50 ℃ of beta transformation point, the cross section of described semi-finished product cylindrical member is that internal diameter is 80mm ~ 100mm, external diameter is the annular of 400mm ~ 420mm, and the height of described semi-finished product cylindrical member is 400mm ~ 450mm;
Step 5, place annealing furnace to carry out annealing in process the cylindrical member of semi-finished product described in the step 4, obtain TC11 titanium alloy small-bore thick walled cylinder parts; The cross section of described TC11 titanium alloy small-bore thick walled cylinder parts is that internal diameter is 80mm ~ 100mm, external diameter is the annular of 400mm ~ 420mm, the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 400mm ~ 450mm, and the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts, it is characterized in that, the titan alloy casting ingot of TC11 described in the step 1 is obtained through 3 vacuum consumable arc-meltings by the TC11 titanium alloy consumable electrode, the quality percentage composition of aluminium is 6.3% ~ 7.0% in the described TC11 titan alloy casting ingot, the quality percentage composition of molybdenum is 3.0% ~ 3.8%, the quality percentage composition of zirconium is 1.2% ~ 2.0%, the quality percentage composition of silicon is 0.25% ~ 0.35%, the quality percentage composition of oxygen is 0.10% ~ 0.12%, the quality percentage composition of iron is 0.12% ~ 0.20%, and surplus is titanium and inevitable impurity.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that, the forging ratio that time cogging of every fire is forged in the step 2 is 1.595 ~ 1.89, and the final forging temperature that time cogging of every fire is forged all is not less than 800 ℃.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts, it is characterized in that, last fire time middle forging ratio of forging is 1.7 in the step 3, the forging ratio of forging in the middle of all the other each fire are inferior is 2.5, all elementary forging stock is carried out figuring of surface between adjacent two fiery times middle the forging and processes.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that, middle strain rate of forging is 0.12s described in the step 3
-1~ 0.16s
-1, every fire time middle final forging temperature of forging all is not less than 800 ℃.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that, every fire becomes the forging ratio of shape forging to be 1.75 ~ 2.15 in the step 4, all middle forging stock is carried out figuring of surface between adjacent two fiery times the one-tenth shape forging and processes.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that, becoming the strain rate of shape forging described in the step 4 is 0.06s
-1~ 0.12s
-1, every fire becomes the final forging temperature of shape forging all to be not less than 800 ℃.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that the rated pressure of forging press described in the step 2 to four is 1700 tons ~ 2100 tons.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts, it is characterized in that, annealing in process described in the step 5 adopts the double annealing system, be specially: at first with the semi-finished product cylindrical member in temperature be under 950 ℃ ~ 980 ℃ the condition behind the insulation 2h cooldown rate with 2 ℃/min ~ 4 ℃/min be cooled to 20 ℃ of room temperatures, then under temperature is 530 ℃ ~ 580 ℃ condition, be incubated 4h ~ 8h after air cooling.
The present invention compared with prior art has the following advantages:
1, the present invention forges the property difference in stage in difference according to the TC11 titanium alloy, adopts different strain rates to forge processing; At first the cogging of TC11 titan alloy casting ingot is forged obtain elementary forging stock after, elementary forging stock is carried out centre forging in 10 ℃ ~ 30 ℃ the temperature range below beta transformation point, the strain rate that this stage takes is 0.12s
-1~ 0.16s
-1, forming the strain rate that the shape forging stage takes is 0.06s
-1~ 0.12s
-1The different forging stages adopt different strain rates can be conducive to prevent forging cracking, reduce resistance of deformation, thereby obtain the consistent finished product forging of even tissue;
2, the present invention takes unidirectional pulling to replace the forging mode of traditional jumping-up or pulling to flat side's forging mode, reduced the distortion dead band, increase the horizontal longitudinally deflection that reaches in the forging process, crystal grain has been controlled in the size range of 1mm ~ 3mm, significantly improved the isotropism of forging;
3, cogging is forged by accurately setting, forge and the forging parameter that becomes shape forging the centre in the present invention, make organizational parameter and the α granule content of each stage forging controlled, can obtain to have the cylindrical member of Good All-around Property, its cooling velocity of because of metal that the rich amount of the mechanical property by 100MPa ~ 150MPa compensates the thick cylinder middle part can not satisfy air cooling and require the intensity level impairment amount that causes;
4, the present invention carries out the design optimization of chemical composition formula to the TC11 titan alloy casting ingot, can increase that its cooling velocity of because of metal that the rich amount of mechanical property of 50MPa ~ 100MPa compensates the thick cylinder middle part can not satisfy that air cooling requires and the intensity level impairment amount that causes;
5, double annealing resolving system of the present invention, the technological parameters such as the annealing temperature in two stages, temperature retention time, the type of cooling meet the Heat Exchange Characteristic of thick walled cylinder parts in intensification and temperature-fall period more, make that the α granule content can be controlled in 10% ~ 30% scope in the microscopic structure of the finished product cylindrical member after the annealing in process, the α particle is in 2 μ m ~ 6 μ m scopes, the β grain size has obtained better tissue topography and ratio mutually in 20 μ m ~ 40 μ m scopes;
6, the present invention adopts the double annealing resolving system, when first stage annealing finishes, can adopt Industrial fan that forging is carried out air blast cooling to 20 ℃ room temperature with the cooldown rate of 2 ℃ ~ 4 ℃/min, to guarantee the cooling velocity requirement of forging thick walled cylinder parts middle part;
7, the present invention does not need the large-tonnage extrusion equipment, and only using rated pressure is that 1700 tons ~ 2100 tons middle-size and small-size forging press just can manufacture high-quality TC11 titanium alloy small-bore thick walled cylinder parts, has reduced equipment investment;
8, take the TC11 titanium alloy small-bore thick walled cylinder parts of the inventive method preparation, its mechanical property tangential and axial both direction all satisfies GJB GJB2744A-2007 requirement; Hot strength 〉=the 1100MPa of TC11 titanium alloy of the present invention small-bore thick walled cylinder parts under room temperature (20 ℃) condition; Yield strength 〉=950MPa; Percentage elongation 〉=14%; The contraction percentage of area 〉=45%; Tensile strength 〉=780MPa under high temperature (500 ℃) condition; Yield strength 〉=615MPa; Percentage elongation 〉=16%; The contraction percentage of area 〉=72%; Enduring quality is qualified; Thermal stability is qualified; Α grade standard requirement among the standard GB/T 5193-85 is satisfied in ultrasonic examination, can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
Below in conjunction with embodiment the present invention is described in further detail.
The specific embodiment
Embodiment 1
The preparation method of the present embodiment TC11 titanium alloy small-bore thick walled cylinder parts may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and the blemish of removal TC11 titan alloy casting ingot; The cross section of described TC11 titan alloy casting ingot is that diameter is the circle of 640mm; Described TC11 titan alloy casting ingot is obtained through 3 vacuum consumable arc-meltings by the TC11 titanium alloy consumable electrode, the quality percentage composition of aluminium is 6.3% in the described TC11 titan alloy casting ingot, the quality percentage composition of molybdenum is 3.0%, the quality percentage composition of zirconium is 1.2%, the quality percentage composition of silicon is 0.25%, the quality percentage composition of oxygen is 0.10%, and the quality percentage composition of iron is 0.12%, and surplus is titanium and inevitable impurity;
Step 2, to adopt rated pressure be that 1700 tons forging press carries out cogging and forges removing TC11 titan alloy casting ingot after the blemish in the step 1, obtains elementary forging stock behind the air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire finishes, the initial forging temperature that time cogging of every fire is forged is above 100 ℃ of beta transformation point, the final forging temperature that time cogging of every fire is forged is 880 ℃, total forging ratio that described cogging is forged is 3.57, the forging ratio that time cogging of every fire is forged is 1.89, and the elementary forging stock after all the centre being forged between forging in the middle of adjacent two fiery times carries out the figuring of surface processing; The cross section of described elementary forging stock is that the length of side is the square of 300mm;
Step 3, employing rated pressure are that 1700 tons forging press carries out centre forging, forging stock in the middle of obtaining after the water-cooled with elementary forging stock described in the step 2; Forge in the middle of described and be divided into 3 fiery inferior finishing, every fire time middle initial forging temperature that forges is following 10 ℃ of beta transformation point, every fire time middle final forging temperature of forging is 870 ℃, wherein the round as a ball forging mode of chamfered edge is adopted in the inferior middle forging of last fire, forging ratio is 1.7, and the inferior middle forging of all the other two fire is all adopted and axially pulled out extremely flat side's forging mode, and forging ratio is 2.5, total forging ratio of forging in the middle of described is 10.63, and described middle strain rate of forging is 0.12s
-1~ 0.16s
-1, the cross section of described middle forging stock is that diameter is the circle of 180mm;
Step 4, with forging stock sawing in the middle of described in the step 3, then adopting rated pressure is that 1700 tons the forging press middle forging stock after with sawing forms forging, to become at last the middle forging stock behind the shape forging to carry out successively punching processing and Shape correction, obtain the semi-finished product cylindrical member after the water-cooled; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 3 fire finishes, every fire becomes the initial forging temperature of shape forging to be following 30 ℃ of beta transformation point, every fire becomes the final forging temperature of shape forging to be 880 ℃, total forging ratio of described one-tenth shape forging is 5.40, the forging ratio of the inferior one-tenth of every fire shape forging is 1.754, and all the middle forging stock behind the one-tenth shape forging is carried out the figuring of surface processing between the adjacent two fire time one-tenth shape forgings, and the strain rate of described one-tenth shape forging is 0.06s
-1~ 0.12s
-1, the cross section of described semi-finished product cylindrical member is that internal diameter is 80mm, and external diameter is the annular of 400mm, and the height of described semi-finished product cylindrical member is 400mm;
Step 5, place annealing furnace to carry out double annealing the cylindrical member of semi-finished product described in the step 4 to process, concrete system is: at first with the semi-finished product cylindrical member in temperature be under 950 ℃ the condition behind the insulation 2h cooldown rate with 2 ℃/min be cooled to 20 ℃ of room temperatures, then air cooling behind insulation 8h under 530 ℃ the condition obtains TC11 titanium alloy small-bore thick walled cylinder parts; The cross section of described TC11 titanium alloy small-bore thick walled cylinder parts is that internal diameter is 80mm, and external diameter is the annular of 400mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 400mm, and the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
The crystallite dimension of forging stock is controlled at 1mm ~ 3mm in the middle of the present embodiment; The α granule content is controlled in 20% ~ 40% scope in the microscopic structure of semi-finished product cylindrical member; The α granule content is controlled in 10% ~ 30% scope in the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, and the α particle is in 2 μ m ~ 6 μ m scopes, and the β grain size is in 20 μ m ~ 40 μ m scopes.The TC11 titanium alloy small-bore thick walled cylinder parts of the present embodiment preparation, its mechanical property tangential and axial both direction all satisfies GJB GJB2744A-2007 requirement.Hot strength 〉=the 1100MPa of TC11 titanium alloy small-bore thick walled cylinder parts under room temperature (20 ℃) condition of the present embodiment preparation; Yield strength 〉=950MPa; Percentage elongation 〉=14%; The contraction percentage of area 〉=45%; Tensile strength 〉=780MPa under high temperature (500 ℃) condition; Yield strength 〉=615MPa; Percentage elongation 〉=16%; The contraction percentage of area 〉=72%; Enduring quality is qualified; Thermal stability is qualified; Α grade standard requirement among the standard GB/T 5193-85 is satisfied in ultrasonic examination; Isotropism is good, and high comprehensive performance can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
Embodiment 2
The preparation method of the present embodiment TC11 titanium alloy small-bore thick walled cylinder parts may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and the blemish of removal TC11 titan alloy casting ingot; The cross section of described TC11 titan alloy casting ingot is that diameter is the circle of 660mm; Described TC11 titan alloy casting ingot is obtained through 3 vacuum consumable arc-meltings by the TC11 titanium alloy consumable electrode, the quality percentage composition of aluminium is 6.5% in the described TC11 titan alloy casting ingot, the quality percentage composition of molybdenum is 3.4%, the quality percentage composition of zirconium is 1.6%, the quality percentage composition of silicon is 0.3%, the quality percentage composition of oxygen is 0.11%, and the quality percentage composition of iron is 0.16%, and surplus is titanium and inevitable impurity;
Step 2, to adopt rated pressure be that 1900 tons forging press carries out cogging and forges removing TC11 titan alloy casting ingot after the blemish in the step 1, obtains elementary forging stock behind the air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire finishes, the initial forging temperature that time cogging of every fire is forged is above 120 ℃ of beta transformation point, the final forging temperature that time cogging of every fire is forged is 900 ℃, total forging ratio that described cogging is forged is 2.79, the forging ratio that time cogging of every fire is forged is 1.67, and the elementary forging stock after all the centre being forged between forging in the middle of adjacent two fiery times carries out the figuring of surface processing; The cross section of described elementary forging stock is that the length of side is the square of 350mm;
Step 3, employing rated pressure are that 1900 tons forging press carries out centre forging, forging stock in the middle of obtaining after the water-cooled with elementary forging stock described in the step 2; Forge in the middle of described and be divided into 4 fiery inferior finishing, every fire time middle initial forging temperature that forges is following 20 ℃ of beta transformation point, every fire time middle terminal temperature that forges is 860 ℃, wherein the round as a ball forging mode of chamfered edge is adopted in the inferior middle forging of last fire, forging ratio is 1.7, and the inferior middle forging of all the other each fire is all adopted and axially pulled out extremely flat side's forging mode, and forging ratio is 2.5, total forging ratio of forging in the middle of described is 26.56, and described middle strain rate of forging is 0.12s
-1~ 0.16s
-1, the cross section of described middle forging stock is that diameter is the circle of 240mm;
Step 4, with forging stock sawing in the middle of described in the step 3, then adopting rated pressure is that 1900 tons the forging press middle forging stock after with sawing forms forging, to become at last the middle forging stock behind the shape forging to carry out successively punching processing and Shape correction, obtain the semi-finished product cylindrical member after the water-cooled; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 2 fire finishes, every fire becomes the initial forging temperature of shape forging to be following 40 ℃ of beta transformation point, every fire becomes the final forging temperature of shape forging to be 830 ℃, total forging ratio of described one-tenth shape forging is 3.2, the forging ratio of the inferior one-tenth of every fire shape forging is 1.83, and all the middle forging stock behind the one-tenth shape forging is carried out the figuring of surface processing between the adjacent two fire time one-tenth shape forgings, and the strain rate of described one-tenth shape forging is 0.06s
-1~ 0.12s
-1, the cross section of described semi-finished product cylindrical member is that internal diameter is 90mm, and external diameter is the annular of 410mm, and the height of described semi-finished product cylindrical member is 420mm;
Step 5, place annealing furnace to carry out double annealing the cylindrical member of semi-finished product described in the step 4 to process, concrete system is: at first with the semi-finished product cylindrical member in temperature be under 960 ℃ the condition behind the insulation 2h cooldown rate with 3 ℃/min be cooled to 20 ℃ of room temperatures, then be air cooling behind the insulation 6h under 550 ℃ the condition in temperature, obtain TC11 titanium alloy small-bore thick walled cylinder parts; The cross section of described TC11 titanium alloy small-bore thick walled cylinder parts is that internal diameter is 90mm, and external diameter is the annular of 410mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 420mm, and the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
The crystallite dimension of forging stock is controlled at 1mm ~ 3mm in the middle of the present embodiment; The α granule content is controlled in 20% ~ 40% scope in the microscopic structure of semi-finished product cylindrical member; The α granule content is controlled in 10% ~ 30% scope in the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, and the α particle is in 2 μ m ~ 6 μ m scopes, and the β grain size is in 20 μ m ~ 40 μ m scopes.The TC11 titanium alloy small-bore thick walled cylinder parts of the present embodiment preparation, its mechanical property tangential and axial both direction all satisfies GJB GJB2744A-2007 requirement.Hot strength 〉=the 1100MPa of TC11 titanium alloy small-bore thick walled cylinder parts under room temperature (20 ℃) condition of the present embodiment preparation; Yield strength 〉=950MPa; Percentage elongation 〉=14%; The contraction percentage of area 〉=45%; Tensile strength 〉=780MPa under high temperature (500 ℃) condition; Yield strength 〉=615MPa; Percentage elongation 〉=16%; The contraction percentage of area 〉=72%; Enduring quality is qualified; Thermal stability is qualified; Α grade standard requirement among the standard GB/T 5193-85 is satisfied in ultrasonic examination; Isotropism is good, and high comprehensive performance can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
Embodiment 3
The preparation method of the present embodiment TC11 titanium alloy small-bore thick walled cylinder parts may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and the blemish of removal TC11 titan alloy casting ingot; The cross section of described TC11 titan alloy casting ingot is that diameter is the circle of 720mm; Described TC11 titan alloy casting ingot is obtained through 3 vacuum consumable arc-meltings by the TC11 titanium alloy consumable electrode, the quality percentage composition of aluminium is 7.0% in the described TC11 titan alloy casting ingot, the quality percentage composition of molybdenum is 3.8%, the quality percentage composition of zirconium is 2.0%, the quality percentage composition of silicon is 0.35%, the quality percentage composition of oxygen is 0.12%, and the quality percentage composition of iron is 0.20%, and surplus is titanium and inevitable impurity;
Step 2, to adopt rated pressure be that 2100 tons forging press carries out cogging and forges removing TC11 titan alloy casting ingot after the blemish in the step 1, obtains elementary forging stock behind the air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire finishes, the initial forging temperature that time cogging of every fire is forged is above 150 ℃ of beta transformation point, the final forging temperature that time cogging of every fire is forged is 800 ℃, total forging ratio that described cogging is forged is 2.54, the forging ratio that time cogging of every fire is forged is 1.595, and the elementary forging stock after all the centre being forged between forging in the middle of adjacent two fiery times carries out the figuring of surface processing; The cross section of described elementary forging stock is that the length of side is the square of 400mm;
Step 3, employing rated pressure are that 2100 tons forging press carries out centre forging, forging stock in the middle of obtaining after the water-cooled with elementary forging stock described in the step 2; Forge in the middle of described and be divided into 5 fiery inferior finishing, every fire time middle initial forging temperature that forges is following 30 ℃ of beta transformation point, every fire time middle terminal temperature that forges is 800 ℃, wherein the round as a ball forging mode of chamfered edge is adopted in the inferior middle forging of last fire, forging ratio is 1.7, the inferior middle forging of all the other each fire is all adopted and is axially pulled out extremely flat side's forging mode, and forging ratio is 2.5, and described middle total forging ratio of forging is 66.41; The strain rate of forging in the middle of described is 0.12s
-1~ 0.16s
-1, the cross section of described middle forging stock is that diameter is the circle of 300mm;
Step 4, with forging stock sawing in the middle of described in the step 3, then adopting rated pressure is that 2100 tons the forging press middle forging stock after with sawing forms forging, to become at last the middle forging stock behind the shape forging to carry out successively punching processing and Shape correction, obtain the semi-finished product cylindrical member after the water-cooled; Described one-tenth shape forging adopts the forging mode of axial jumping-up, be divided into 1 fire and finish, the initial forging temperature that becomes shape forging is following 50 ℃ of beta transformation point, and becoming the final forging temperature of shape forging is 800 ℃, becoming the forging ratio of shape forging is 2.15, and becoming the strain rate of shape forging is 0.06s
-1~ 0.12s
-1, the cross section of described semi-finished product cylindrical member is that internal diameter is 100mm, and external diameter is the annular of 420mm, and the height of described semi-finished product cylindrical member is 450mm;
Step 5, place annealing furnace to carry out double annealing the cylindrical member of semi-finished product described in the step 4 to process, concrete system is: at first with the semi-finished product cylindrical member in temperature be under 980 ℃ the condition behind the insulation 2h with 20 ℃ of room temperatures of cooldown rate cooling of 4 ℃/min, then temperature be under 580 ℃ the condition behind the insulation 4h air cooling obtain TC11 titanium alloy small-bore thick walled cylinder parts; The cross section of described TC11 titanium alloy small-bore thick walled cylinder parts is that internal diameter is 100mm, and external diameter is the annular of 420mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 450mm, and the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
The crystallite dimension of forging stock is controlled at 1mm ~ 3mm in the middle of the present embodiment; The α granule content is controlled in 20% ~ 40% scope in the microscopic structure of semi-finished product cylindrical member; The α granule content is controlled in 10% ~ 30% scope in the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, and the α particle is in 2 μ m ~ 6 μ m scopes, and the β grain size is in 20 μ m ~ 40 μ m scopes.The TC11 titanium alloy small-bore thick walled cylinder parts of the present embodiment preparation, its mechanical property tangential and axial both direction all satisfies GJB GJB2744A-2007 requirement.Hot strength 〉=the 1100MPa of TC11 titanium alloy small-bore thick walled cylinder parts under room temperature (20 ℃) condition of the present embodiment preparation; Yield strength 〉=950MPa; Percentage elongation 〉=14%; The contraction percentage of area 〉=45%; Tensile strength 〉=780MPa under high temperature (500 ℃) condition; Yield strength 〉=615MPa; Percentage elongation 〉=16%; The contraction percentage of area 〉=72%; Enduring quality is qualified; Thermal stability is qualified; Α grade standard requirement among the standard GB/T 5193-85 is satisfied in ultrasonic examination; Isotropism is good, and high comprehensive performance can be used for making the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
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 (9)
1. the preparation method of a TC11 titanium alloy small-bore thick walled cylinder parts is characterized in that, the method may further comprise the steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and the blemish of removal TC11 titan alloy casting ingot; The cross section of described TC11 titan alloy casting ingot is that diameter is the circle of 640mm ~ 720mm;
Step 2, adopt forging press to carry out cogging and forge removing TC11 titan alloy casting ingot after the blemish in the step 1, obtain elementary forging stock behind the air cooling; Described cogging is forged and is adopted the axially forging mode of pulling, is divided into two fire and finishes, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃ ~ 150 ℃ of beta transformation point, and the cross section of described elementary forging stock is that the length of side is the square of 300mm ~ 400mm;
Step 3, employing forging press carry out the centre with elementary forging stock described in the step 2 and forge forging stock in the middle of obtaining after the water-cooled; Forge in the middle of described and be divided into 3 ~ 5 fiery inferior finishing, every fire time middle initial forging temperature that forges is following 10 ℃ ~ 30 ℃ of beta transformation point, wherein the round as a ball forging mode of chamfered edge is adopted in the inferior middle forging of last fire, the inferior middle forging of all the other each fire is all adopted and is axially pulled out extremely flat side's forging mode, and the cross section of described middle forging stock is that diameter is the circle of 180mm ~ 300mm;
Step 4, with forging stock sawing in the middle of described in the step 3, then the middle forging stock after adopting forging press with sawing forms forging, to become at last the middle forging stock behind the shape forging to carry out successively punching processing and Shape correction, obtain the semi-finished product cylindrical member after the water-cooled; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 1 ~ 3 fire finishes, every fire becomes the initial forging temperature of shape forging to be following 30 ℃ ~ 50 ℃ of beta transformation point, the cross section of described semi-finished product cylindrical member is that internal diameter is 80mm ~ 100mm, external diameter is the annular of 400mm ~ 420mm, and the height of described semi-finished product cylindrical member is 400mm ~ 450mm;
Step 5, place annealing furnace to carry out annealing in process the cylindrical member of semi-finished product described in the step 4, obtain TC11 titanium alloy small-bore thick walled cylinder parts; The cross section of described TC11 titanium alloy small-bore thick walled cylinder parts is that internal diameter is 80mm ~ 100mm, external diameter is the annular of 400mm ~ 420mm, the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 400mm ~ 450mm, and the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
2. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts, it is characterized in that, the titan alloy casting ingot of TC11 described in the step 1 is obtained through 3 vacuum consumable arc-meltings by the TC11 titanium alloy consumable electrode, the quality percentage composition of aluminium is 6.3% ~ 7.0% in the described TC11 titan alloy casting ingot, the quality percentage composition of molybdenum is 3.0% ~ 3.8%, the quality percentage composition of zirconium is 1.2% ~ 2.0%, the quality percentage composition of silicon is 0.25% ~ 0.35%, the quality percentage composition of oxygen is 0.10% ~ 0.12%, the quality percentage composition of iron is 0.12% ~ 0.20%, and surplus is titanium and inevitable impurity.
3. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts is characterized in that, the forging ratio that time cogging of every fire is forged in the step 2 is 1.595 ~ 1.89, and the final forging temperature that time cogging of every fire is forged all is not less than 800 ℃.
4. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts, it is characterized in that, last fire time middle forging ratio of forging is 1.7 in the step 3, the forging ratio of forging in the middle of all the other each fire are inferior is 2.5, all elementary forging stock is carried out figuring of surface between adjacent two fiery times middle the forging and processes.
5. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts is characterized in that, the strain rate of forging in the middle of described in the step 3 is 0.12s
-1~ 0.16s
-1, every fire time middle final forging temperature of forging all is not less than 800 ℃.
6. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts, it is characterized in that, every fire becomes the forging ratio of shape forging to be 1.75 ~ 2.15 in the step 4, all middle forging stock is carried out figuring of surface between adjacent two fiery times the one-tenth shape forging and processes.
7. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts is characterized in that, becoming the strain rate of shape forging described in the step 4 is 0.06s
-1~ 0.12s
-1, every fire becomes the final forging temperature of shape forging all to be not less than 800 ℃.
8. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts is characterized in that, the rated pressure of forging press described in the step 2 to four is 1700 tons ~ 2100 tons.
9. the preparation method of a kind of TC11 titanium alloy according to claim 1 small-bore thick walled cylinder parts, it is characterized in that, annealing in process described in the step 5 adopts the double annealing system, be specially: at first with the semi-finished product cylindrical member in temperature be under 950 ℃ ~ 980 ℃ the condition behind the insulation 2h cooldown rate with 2 ℃/min ~ 4 ℃/min be cooled to 20 ℃ of room temperatures, then under temperature is 530 ℃ ~ 580 ℃ condition, be incubated 4h ~ 8h after air cooling.
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