CN103071743B - 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 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 is Ti-6.5 Α l-3.5Mo-1.5Zr-0.3Si, belongs to martensite type (alpha+beta) two-phase thermal strength titanium alloy, can be used for manufacturing the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).These two kinds of vulnerable components that titanium structural member is airplane wheel, for guaranteeing that aircraft safety rises and falls, aircraft flight necessarily rises and falls after number of times and just needs timely replacing, 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 complete small lot trial-production and production capacity, and need large-tonnage extruder to produce, domestic most forge plant cannot be produced because of this appointed condition of tool not, brake housing and cushion disk(-sc) still need import in enormous quantities every year at present, 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, to 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 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 forging its cooling velocity of metal of barrel middle part in rear cooling procedure and in the cooling procedure of the dual heat treatment of forging first stage, can not meet the rate request of air cooling, the phase composition of the secondaryαphase that in metal microstructure, β produces mutually and the steady β phase of Jie of retention, distribution is all because cooling velocity has been different from as air-cooled condition too slowly, 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 more than 3150 tons large-scale extrusion equipments, cause production cost higher.And adopt existing technique, 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, 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, provides that a kind of preparation technology is simple, the preparation method of TC11 titanium alloy small-bore thick walled cylinder parts that can large-scale industrial production.The method is forged the physical property feature in stage according to TC11 titanium alloy at each, blank link in the middle of forging, take pulling to flat side's forging mode to increase horizontal stroke, longitudinal deformation amount, the crystallite dimension of semi-finished product circle base is controlled to 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 state is controlled in 20～40% scopes, and in the finished product forging microscopic structure after heat treatment, α granule content is controlled in 10%～30% scope.The isotropism of TC11 titanium alloy small-bore thick walled cylinder parts prepared by employing the method is good, and high comprehensive performance, can be used for manufacturing 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 comprises the following steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and remove the blemish of 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, employing forging press carry out cogging forging by the TC11 titan alloy casting ingot of removing in step 1 after blemish, obtain elementary forging stock after air cooling; Described cogging is forged and is adopted the axially forging mode of pulling, is divided into two fire and completes, 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 centre by elementary forging stock described in step 2 and forge, forging stock in the middle of obtaining after water-cooled; In the middle of described, forge and be divided into 3～5 fiery inferior completing, every fire time middle initial forging temperature forging is following 10 ℃～30 ℃ of beta transformation point, wherein the inferior middle forging of last fire adopts the round as a ball forging mode of chamfered edge, the inferior middle forging of all the other each fire all adopts and axially pulls 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, by forging stock sawing in the middle of described in step 3, then adopt forging press that the middle forging stock after sawing is formed to forging, finally, by becoming the middle forging stock after shape forging to carry out successively punching processing and Shape correction, after water-cooled, obtain semi-finished product cylindrical member; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 1～3 fire completes, 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, the cylindrical member of semi-finished product described in step 4 is placed in to annealing furnace carries out annealing in process, 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 step 1 is obtained through 3 vacuum consumable arc-meltings by TC11 titanium alloy consumable electrode, in described TC11 titan alloy casting ingot, the quality percentage composition of aluminium is 6.3%～7.0%, 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%, 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 in step 2, time cogging of every fire is forged is 1.595～1.89, and the final forging temperature that time cogging of every fire is forged is all 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, in step 3, last fire time middle forging ratio of forging is 1.7, the forging ratio of forging in the middle of all the other each fire are inferior is 2.5, between middle forging of adjacent two fiery times, all elementary forging stock is carried out to figuring of surface processing.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts, is characterized in that, described in step 3, middle strain rate of forging is 0.12s
-1～0.16s
-1, every fire time middle final forging temperature of forging is all 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, in step 4, every fire becomes the forging ratio of shape forging to be 1.75～2.15, between the one-tenth shape forging of adjacent two fiery times, all middle forging stock is carried out to figuring of surface processing.
The preparation method of above-mentioned a kind of TC11 titanium alloy small-bore thick walled cylinder parts, is characterized in that, the strain rate that becomes shape forging described in step 4 is 0.06s
-1～0.12s
-1, every fire becomes the final forging temperature of shape forging to be all 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 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 step 5 adopts double annealing system, be specially: by semi-finished product cylindrical member, in temperature, be first that after being incubated 2h under the condition of 950 ℃～980 ℃, the cooldown rate with 2 ℃/min～4 ℃/min is cooled to 20 ℃ of room temperatures, then under temperature is the condition of 530 ℃～580 ℃, 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 TC11 titanium alloy, adopts different strain rates to forge processing; First the cogging of TC11 titan alloy casting ingot is forged and to be obtained after elementary forging stock, elementary forging stock is carried out to centre forging in the temperature range of 10 ℃～30 ℃ 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
-1; The 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 flat side's forging mode, to replace the forging mode of traditional jumping-up or pulling, reduced distortion dead band, increased in forging process laterally and deflection longitudinally, crystal grain has been controlled in the size range of 1mm～3mm, significantly improved the isotropism of forging;
3, by accurately setting, cogging is forged, forge and the forging parameter that becomes shape forging centre in the present invention, make organizational parameter and the α granule content of each stage forging controlled, can obtain the cylindrical member with Good All-around Property, its cooling velocity of because of metal that the rich amount of mechanical property by 100MPa～150MPa compensates thick cylinder middle part can not meet air cooling and require the intensity level impairment causing to measure;
4, the present invention carries out the design optimization of chemical composition formula to 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 thick cylinder middle part can not meet 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, α granule content in the microscopic structure of the finished product cylindrical member after annealing in process is can be controlled in 10%～30% scope, α particle is within the scope of 2 μ m～6 μ m, β grain size, within the scope of 20 μ m～40 μ m, has obtained preferably tissue topography and phase ratio;
6, the present invention adopts double annealing resolving system, when first stage annealing finishes, can adopt Industrial fan with the cooldown rate of 2 ℃～4 ℃/min, to carry out air blast cooling to 20 ℃ room temperature to forging, to guarantee the cooling velocity requirement of forging thick walled cylinder parts middle part;
7, the present invention does not need large-tonnage extrusion equipment, and only using rated pressure is that the middle-size and small-size forging press of 1700 tons～2100 tons just can manufacture high-quality TC11 titanium alloy small-bore thick walled cylinder parts, has reduced equipment investment;
8, the TC11 titanium alloy small-bore thick walled cylinder parts of taking the inventive method to prepare, its mechanical property tangential and axial both direction all meets 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; Ultrasonic examination meets Α grade standard requirement in standard GB/T 5193-85, can be used for manufacturing 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 comprises the following steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and remove the blemish of 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 TC11 titanium alloy consumable electrode, in described TC11 titan alloy casting ingot, the quality percentage composition of aluminium is 6.3%, 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, employing rated pressure are that the forging press of 1700 tons carries out cogging forging by the TC11 titan alloy casting ingot of removing in step 1 after blemish, obtain elementary forging stock after air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire completes, 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 centre being forged between adjacent two fire time middle forging carries out 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 the forging press of 1700 tons carries out centre forging, forging stock in the middle of obtaining after water-cooled by elementary forging stock described in step 2, in the middle of described, forge and be divided into 3 fiery inferior completing, every fire time middle initial forging temperature forging is following 10 ℃ of beta transformation point, every fire time middle final forging temperature of forging is 870 ℃, wherein the inferior middle forging of last fire adopts the round as a ball forging mode of chamfered edge, forging ratio is 1.7, the inferior middle forging of all the other two fire all adopts and axially pulls out extremely flat side's forging mode, forging ratio is 2.5, total forging ratio of forging in the middle of described is 10.63, between forging in the middle of adjacent two fiery times, all elementary forging stock is carried out to figuring of surface processing, 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 180mm,
Step 4, by forging stock sawing in the middle of described in step 3, then adopting rated pressure is that the forging press of 1700 tons forms forging by the middle forging stock after sawing, finally, by becoming the middle forging stock after shape forging to carry out successively punching processing and Shape correction, after water-cooled, obtain semi-finished product cylindrical member; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 3 fire completes, 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 after one-tenth shape forging is carried out to figuring of surface processing between 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, the annular that external diameter is 400mm, and the height of described semi-finished product cylindrical member is 400mm;
Step 5, the cylindrical member of semi-finished product described in step 4 is placed in to annealing furnace carries out double annealing processing, concrete system is: by semi-finished product cylindrical member, in temperature, be first that after being incubated 2h under the condition of 950 ℃, the cooldown rate with 2 ℃/min is cooled to 20 ℃ of room temperatures, then air cooling after being incubated 8h under the condition of 530 ℃, 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, the annular that external diameter is 400mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 400mm, the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
In the middle of the present embodiment, the crystallite dimension of forging stock is controlled at 1mm～3mm; In the microscopic structure of semi-finished product cylindrical member, α granule content is controlled in 20%～40% scope; In the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, α granule content is controlled in 10%～30% scope, and α particle is within the scope of 2 μ m～6 μ m, and β grain size is within the scope of 20 μ m～40 μ m.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment, its mechanical property tangential and axial both direction all meets GJB GJB2744A-2007 requirement.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment hot strength >=1100MPa 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; Ultrasonic examination meets Α grade standard requirement in standard GB/T 5193-85; Isotropism is good, and high comprehensive performance can be used for manufacturing 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 comprises the following steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and remove the blemish of 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 TC11 titanium alloy consumable electrode, in described TC11 titan alloy casting ingot, the quality percentage composition of aluminium is 6.5%, 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, employing rated pressure are that the forging press of 1900 tons carries out cogging forging by the TC11 titan alloy casting ingot of removing in step 1 after blemish, obtain elementary forging stock after air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire completes, 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 centre being forged between adjacent two fire time middle forging carries out 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 the forging press of 1900 tons carries out centre forging, forging stock in the middle of obtaining after water-cooled by elementary forging stock described in step 2, in the middle of described, forge and be divided into 4 fiery inferior completing, every fire time middle initial forging temperature forging is following 20 ℃ of beta transformation point, every fire time middle terminal temperature forging is 860 ℃, wherein the inferior middle forging of last fire adopts the round as a ball forging mode of chamfered edge, forging ratio is 1.7, the inferior middle forging of all the other each fire all adopts and axially pulls out extremely flat side's forging mode, forging ratio is 2.5, total forging ratio of forging in the middle of described is 26.56, between forging in the middle of adjacent two fiery times, all elementary forging stock is carried out to figuring of surface processing, 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 240mm,
Step 4, by forging stock sawing in the middle of described in step 3, then adopting rated pressure is that the forging press of 1900 tons forms forging by the middle forging stock after sawing, finally, by becoming the middle forging stock after shape forging to carry out successively punching processing and Shape correction, after water-cooled, obtain semi-finished product cylindrical member; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 2 fire completes, 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 after one-tenth shape forging is carried out to figuring of surface processing between 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, the annular that external diameter is 410mm, and the height of described semi-finished product cylindrical member is 420mm;
Step 5, the cylindrical member of semi-finished product described in step 4 is placed in to annealing furnace carries out double annealing processing, concrete system is: by semi-finished product cylindrical member, in temperature, be first that after being incubated 2h under the condition of 960 ℃, the cooldown rate with 3 ℃/min is cooled to 20 ℃ of room temperatures, then air cooling after being incubated 6h under temperature is the condition of 550 ℃, 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 90mm, the annular that external diameter is 410mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 420mm, the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
In the middle of the present embodiment, the crystallite dimension of forging stock is controlled at 1mm～3mm; In the microscopic structure of semi-finished product cylindrical member, α granule content is controlled in 20%～40% scope; In the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, α granule content is controlled in 10%～30% scope, and α particle is within the scope of 2 μ m～6 μ m, and β grain size is within the scope of 20 μ m～40 μ m.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment, its mechanical property tangential and axial both direction all meets GJB GJB2744A-2007 requirement.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment hot strength >=1100MPa 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; Ultrasonic examination meets Α grade standard requirement in standard GB/T 5193-85; Isotropism is good, and high comprehensive performance can be used for manufacturing 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 comprises the following steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and remove the blemish of 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 TC11 titanium alloy consumable electrode, in described TC11 titan alloy casting ingot, the quality percentage composition of aluminium is 7.0%, 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, employing rated pressure are that the forging press of 2100 tons carries out cogging forging by the TC11 titan alloy casting ingot of removing in step 1 after blemish, obtain elementary forging stock after air cooling; The axially forging mode of pulling that adopts is forged in described cogging, being divided into two fire completes, 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 centre being forged between adjacent two fire time middle forging carries out 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 the forging press of 2100 tons carries out centre forging, forging stock in the middle of obtaining after water-cooled by elementary forging stock described in step 2; In the middle of described, forge and be divided into 5 fiery inferior completing, every fire time middle initial forging temperature forging is following 30 ℃ of beta transformation point, every fire time middle terminal temperature forging is 800 ℃, wherein the inferior middle forging of last fire adopts the round as a ball forging mode of chamfered edge, forging ratio is 1.7, the inferior middle forging of all the other each fire all adopts and axially pulls out extremely flat side's forging mode, forging ratio is 2.5, total forging ratio of forging in the middle of described is 66.41, between middle forging of adjacent two fiery times, all elementary forging stock is carried out to figuring of surface processing; 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, by forging stock sawing in the middle of described in step 3, then adopting rated pressure is that the forging press of 2100 tons forms forging by the middle forging stock after sawing, finally, by becoming the middle forging stock after shape forging to carry out successively punching processing and Shape correction, after water-cooled, obtain semi-finished product cylindrical member; Described one-tenth shape forging adopts the forging mode of axial jumping-up, be divided into 1 fire and complete, 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, the annular that external diameter is 420mm, and the height of described semi-finished product cylindrical member is 450mm;
Step 5, the cylindrical member of semi-finished product described in step 4 is placed in to annealing furnace carries out double annealing processing, concrete system is: by semi-finished product cylindrical member, in temperature, be first that after being incubated 2h under the condition of 980 ℃, the cooldown rate with 4 ℃/min is cooled to 20 ℃ of room temperatures, then under temperature is the condition of 580 ℃, be incubated 4h after 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, the annular that external diameter is 420mm, and the height of described TC11 titanium alloy small-bore thick walled cylinder parts is 450mm, the wall thickness of described TC11 titanium alloy small-bore thick walled cylinder parts is 160mm.
In the middle of the present embodiment, the crystallite dimension of forging stock is controlled at 1mm～3mm; In the microscopic structure of semi-finished product cylindrical member, α granule content is controlled in 20%～40% scope; In the microscopic structure of TC11 titanium alloy small-bore thick walled cylinder parts, α granule content is controlled in 10%～30% scope, and α particle is within the scope of 2 μ m～6 μ m, and β grain size is within the scope of 20 μ m～40 μ m.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment, its mechanical property tangential and axial both direction all meets GJB GJB2744A-2007 requirement.TC11 titanium alloy small-bore thick walled cylinder parts prepared by the present embodiment hot strength >=1100MPa 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; Ultrasonic examination meets Α grade standard requirement in standard GB/T 5193-85; Isotropism is good, and high comprehensive performance can be used for manufacturing the crucial load-carrying members such as main airplane wheel brake housing and cushion disk(-sc).
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 (9)
1. a preparation method for TC11 titanium alloy small-bore thick walled cylinder parts, is characterized in that, the method comprises the following steps:
At the bottom of the rising head and ingot of step 1, excision TC11 titan alloy casting ingot, and remove the blemish of 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, employing forging press carry out cogging forging by the TC11 titan alloy casting ingot of removing in step 1 after blemish, obtain elementary forging stock after air cooling; Described cogging is forged and is adopted the axially forging mode of pulling, is divided into two fire and completes, 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 centre by elementary forging stock described in step 2 and forge, forging stock in the middle of obtaining after water-cooled; In the middle of described, forge and be divided into 3 ~ 5 fiery inferior completing, every fire time middle initial forging temperature forging is following 10 ℃ ~ 30 ℃ of beta transformation point, wherein the inferior middle forging of last fire adopts the round as a ball forging mode of chamfered edge, the inferior middle forging of all the other each fire all adopts and axially pulls 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, by forging stock sawing in the middle of described in step 3, then adopt forging press that the middle forging stock after sawing is formed to forging, finally, by becoming the middle forging stock after shape forging to carry out successively punching processing and Shape correction, after water-cooled, obtain semi-finished product cylindrical member; Described one-tenth shape forging adopts the forging mode of axial jumping-up, being divided into 1 ~ 3 fire completes, 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, the cylindrical member of semi-finished product described in step 4 is placed in to annealing furnace carries out annealing in process, 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 step 1 is obtained through 3 vacuum consumable arc-meltings by TC11 titanium alloy consumable electrode, in described TC11 titan alloy casting ingot, the quality percentage composition of aluminium is 6.3% ~ 7.0%, 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%, 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 in step 2, time cogging of every fire is forged is 1.595 ~ 1.89, and the final forging temperature that time cogging of every fire is forged is all 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, in step 3, last fire time middle forging ratio of forging is 1.7, the forging ratio of forging in the middle of all the other each fire are inferior is 2.5, between middle forging of adjacent two fiery times, all elementary forging stock is carried out to figuring of surface processing.
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, described in step 3, middle strain rate of forging is 0.12s
-1~ 0.16s
-1, every fire time middle final forging temperature of forging is all 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, in step 4, every fire becomes the forging ratio of shape forging to be 1.75 ~ 2.15, between the one-tenth shape forging of adjacent two fiery times, all middle forging stock is carried out to figuring of surface processing.
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, the strain rate that becomes shape forging described in step 4 is 0.06s
-1~ 0.12s
-1, every fire becomes the final forging temperature of shape forging to be all 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 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 step 5 adopts double annealing system, be specially: by semi-finished product cylindrical member, in temperature, be first that after being incubated 2h under the condition of 950 ℃ ~ 980 ℃, the cooldown rate with 2 ℃/min ~ 4 ℃/min is cooled to 20 ℃ of room temperatures, then under temperature is the condition of 530 ℃ ~ 580 ℃, be incubated 4h ~ 8h after air cooling.
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| CN103320734B (en) * | 2013-06-26 | 2015-02-18 | 西安赛特金属材料开发有限公司 | Production method of medical fine-grain titanium/titanium alloy bar |
| CN103469136B (en) * | 2013-09-29 | 2015-08-05 | 西北有色金属研究院 | The preparation method of the TC11 titanium alloy cake material that a kind of fatigue strength is high |
| CN103894441B (en) * | 2014-03-20 | 2016-06-29 | 宝鸡拓普达钛业有限责任公司 | The processing method of TC4 titanium alloy thick-wall pipe material |
| CN104451491B (en) * | 2014-12-15 | 2016-11-30 | 西北有色金属研究院 | A kind of preparation method of Ti12LC titanium alloy forging |
| CN106425317A (en) * | 2016-11-15 | 2017-02-22 | 宝钛集团有限公司 | Preparation method of Ti-B19 high-strength titanium alloy large-caliber thick wall pipe |
| CN113913714B (en) * | 2020-07-08 | 2022-06-24 | 中南大学 | Method for refining TC18 titanium alloy beta grains by adopting stepped strain rate forging process |
| CN112264566B (en) * | 2020-09-22 | 2023-08-01 | 宝鸡钛业股份有限公司 | Processing method of large heat-strength titanium alloy forging |
| CN112548010B (en) * | 2020-11-05 | 2024-04-09 | 宝钛集团有限公司 | Preparation method of titanium alloy elliptical ring material |
| CN113182476B (en) * | 2021-04-28 | 2023-10-13 | 西部钛业有限责任公司 | Preparation method of high-strength TC11 titanium alloy forging |
| CN114346137B (en) * | 2021-12-06 | 2023-10-13 | 中国科学院金属研究所 | Hot working preparation method of large-size titanium alloy bar with uniform ribbon-shaped structure |
| CN114351066B (en) * | 2021-12-31 | 2023-03-28 | 无锡透平叶片有限公司 | Preparation method of TC11 forging with 1060MPa strength level |
| CN116871345B (en) * | 2023-09-06 | 2023-12-01 | 陕西长羽航空装备股份有限公司 | Reverse extrusion forming method for small-sized dissimilar alloy |
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