CN105112831A - Method for preparing BT5-1 titanium alloy ring material used in low-temperature environment - Google Patents
Method for preparing BT5-1 titanium alloy ring material used in low-temperature environment Download PDFInfo
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Abstract
The invention provides a method for preparing a BT5-1 titanium alloy ring material used in a low-temperature environment. The method for preparing the BT5-1 titanium alloy ring material used in the low-temperature environment comprises the following steps that 1, a BT5-1 titanium ingot is smelted, the BT5-1 titanium ingot is stripped and sampled to be subjected to chemical analysis, and main components and impurity components are detected; 2, blooming forging is conducted on the BT5-1 titanium cast ingot, so that a bar billet is obtained; 3, the BT5-1 bar billet is sawed according to the specific size of the ring material, then the BT5-1 bar billet is subjected to upsetting three times and pulling three times to be forged firstly, and then oxide skin and cracks are polished; 4, the polished BT5-1 bar billet is upset and pulled once and then forged into the ring material by means of a chamfering mandrel; 5, stress relief annealing treatment is conducted on the forged BT5-1 ring material; 6, a sample is selected at random for mechanical property analysis; and 7, machining is conducted, and a finished product is obtained. The BT5-1 titanium alloy ring material prepared through the method is excellent both in low-temperature mechanical property and in indoor-temperature mechanical property and suitable for large-scale industrial production.
Description
Technical field
The invention belongs to titanium alloy material preparing technical field, be specifically related to a kind of preparation method of the BT5-1 titanium alloy ring material used at low ambient temperatures.
Background technology
BT5-1 titanium alloy is alpha+beta titanium alloys, because having the advantage such as higher heat resistance and excellent very low temperature performance, is widely used in the key component such as aerospace thruster part and very low temperature storage.Because the working plasticity of BT5-1 titanium alloy in the temperature range of two-phase region is poor, easily at the inside and outside formation crackle of forging, forging allowable transformation amount is less, in addition the outwardness in forging distortion dead band.Therefore, the key problem in technology that Composition Design is production high-quality BT5-1 titanium alloy forging is carried out according to requirements to BT5-1 titanium alloy.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of preparation method of BT5-1 titanium alloy ring material.The method, for the physical property characteristic of BT5-1 titanium alloy material, point carries out proportion design by studying BT5-1 Ti Alloying, and the Comprehensive Control to smithing technological parameters such as initial forging temperature, final forging temperature, passage forging ratio, total forgings ratio.The BT5-1 titanium alloy ring material that final acquisition performance is up to standard.Adopt BT5-1 titanium alloy ring material prepared by the method, the tensile strength >=835MPa under room temperature (20 DEG C) condition, yield strength >=770MPa, unit elongation >=15%, relative reduction in area >=35%; Tensile strength >=1450MPa under very low temperature (-253 DEG C) condition, unit elongation >=12%; UT (Ultrasonic Testing) meets A grade standard requirement in standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis ", the BT5-1 titanium alloy ring material homogeneous microstructure adopting the method to prepare is described, cryogenic mechanical performance and normal temperature mechanical property are all excellent, are suitable for large-scale industrial production.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A preparation method for BT5-1 titanium alloy ring material, the method comprises the following steps:
Step one: adopt the vacuum consumable electrode arc furnace of 1.5t to carry out the melting of BT5-1 titanium ingot; The cross section of described BT5-1 titan alloy casting ingot is diameter is 480mm; Described BT5-1 titan alloy casting ingot carries out 3 meltings by vacuum consumable electrode arc furnace to obtain; In described BT5-1 titan alloy casting ingot, the mass percentage of Sn is 2.4% ~ 2.6%, the mass percentage of AL is 4.9% ~ 5.1%, the mass percentage of O is 0.12% ~ 0.15%, Fe<0.043%, C<0.02%, N<0.008%, H<0.0015%;
Step 2: adopt 3t Single arm that the BT5-1 titan alloy casting ingot after car light in step one is carried out cogging forging, obtain excellent base after air cooling; Described cogging forging adopts the forging mode of axially pulling, is divided into 3 ~ 4 fire and completes, the initial forging temperature of every fire time cogging forging all more than beta transformation point (1020 DEG C) 100 DEG C ~ 150 DEG C, and the forging ratio of every fire time cogging forging is 2.5 ~ 3.5; Total forging ratio of described cogging forging is 7.5 ~ 10.0;
Step 3: base excellent described in step 2 is carried out sawing according to ring material size, three piers three then adopting 2t Single arm the excellent base after sawing to be carried out 2 ~ 3 fire secondary pull out; Described one-tenth shape forging adopts the forging mode of axial jumping-up commutation pulling, and the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 15 ~ 35 DEG C below, and total forging ratio of described one-tenth shape forging is 6.0 ~ 8.0;
Step 4: by step 3 after three piers three pull out, the BT5-1 rod base of polishing again adopts 0.75t air hammer to carry out a pier and pulls out, ring material is forged into again with saddle, the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 25 ~ 40 DEG C below, and total forging ratio of described one-tenth shape forging is 3.5 ~ 5.0;
Step 5: carry out stress relief annealing by step 4 with the BT5-1 titanium ring after saddle forging, annealing temperature is at 800 ~ 850 DEG C, and soaking time is at 1.5 ~ 2h;
Step 6: the BT5-1 titanium ring after stress relief annealing will be carried out in step 5, random rotation direction is materialsed φ 12*110,3, carries out mechanics properties testing;
Step 7: the BT5-1 titanium ring after stress relief annealing will be carried out in step 5, and carry out mechanical workout with 30 lathes.
Described Sn allocates into the form of Al-Sn master alloy, can avoid BT5-1 titanium ingot, in vacuum consumable electrode arc furnace, segregation occurs like this.
In step 2, time cogging forging of every fire is divided equally 3 ~ 4 fire and is completed, and the forging ratio of every time cogging forging is 2.5 ~ 3.5, the final forging temperature of every fire time cogging forging all >=850 DEG C.
In step 3, every fire time three piers three pull out forging ratio 1.5 ~ 2.5, every fire time final forging temperature all >=850 DEG C.
Become shape forging to be divided into two passages in step 4 to complete, the first passage advanced row pier pulls out forging ratio and is 3.0 ~ 4.0; Final forging temperature >=800 DEG C becoming shape forging described in ring are rolled again with saddle forging.
The present invention compared with prior art has the following advantages:
1, the present invention is directed to the physical property characteristic of BT5-1 titanium alloy material, point proportion design is carried out by studying BT5-1 Ti Alloying, and the Comprehensive Control to smithing technological parameters such as initial forging temperature, final forging temperature, passage forging ratio, total forgings ratio, the final BT5-1 titanium alloy ring material with reasonable mechanical property that obtains; First the present invention adopts axially pulling forging mode to carry out cogging forging, then adopts axis, and three piers three of radial jumping-up and pulling repeatedly pull out forging mode and carry out centre forging, and make the homogeneous microstructure of the BT5-1 titanium alloy after middle forging, crystal grain is fully broken.Finally adopt saddle forging to carry out the one-tenth shape forging of ring material, make BT5-1 titanium alloy ring material make BT5-1 titanium alloy ring material in the end a fire be time shaping can fully be out of shape, thus obtain better mechanical property; The present invention pulls out BT5-1 titanium alloy crystal grain fully broken by three piers three, makes the BT5-1 titanium alloy ring material of preparation meet the requirement of room temperature strength and low-temperature flexibility.
2, the present invention is by carrying out proportion design to BT5-1 titanium alloy, especially to the interpolation form of element and the controls of mass content such as Al, O, Sn in BT5-1 titanium alloy, makes the BT5-1 titanium alloy ring material of preparation possess good low-temperature flexibility and room-temperature property.
3, the inventive method technique is simple, the organizational parameter in controlled forge process each stage by quantifying, make the lot stability of BT5-1 titanium alloy ring section product obtain real guarantee, BT5-1 titanium alloy ring excellent performance under ultra-low temperature surroundings of preparation, can be applicable to the key components such as very low temperature storage.
The all excellent tensile strength >=835MPa under room temperature (20 DEG C) condition of the very low temperature mechanical property of the BT5-1 titanium alloy ring material 4, taking the inventive method to prepare and normal temperature mechanical property, yield strength >=770MPa, unit elongation >=15%, relative reduction in area >=35%; Tensile strength >=1450MPa under very low temperature (-253 DEG C) condition, unit elongation >=12%; UT (Ultrasonic Testing) meets A grade standard requirement in standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis ".
5, the preparation method of BT5-1 titanium alloy ring material of the present invention, with traditional temperature be beta transformation point (1020 DEG C) below under the condition of 30 ~ 80 DEG C forging work in-process compare with the preparation method of finished product, the forging temperature of the inventive method improves 15 ~ 35 DEG C, make BT5-1 titanium alloy working plasticity be improved significantly, the reconditioning quality that namely the invisible waste amount of every fire time forging is brought by forge crack can lower 3%, greatly reduces production cost.
6, the preparation method of BT5-1 titanium alloy ring material of the present invention, little to the dependency of equipment performance, without the need to special equipment or complex apparatus, adopts conventional Single arm and air hammer namely can realize large-scale industrial production.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Embodiment 1
The preparation method of the present embodiment BT5-1 titanium alloy ring material comprises the following steps:
Step one: adopt the vacuum consumable electrode arc furnace of 1.5t to carry out the melting of BT5-1 titanium ingot; The cross section of described BT5-1 titan alloy casting ingot is diameter is 480mm; Described BT5-1 titan alloy casting ingot carries out 3 meltings by vacuum consumable electrode arc furnace and obtains; In described BT5-1 titan alloy casting ingot, the mass percentage of Sn is 2.4%, the mass percentage of AL is 4.9%, the mass percentage of O is 0.12%, Fe<0.043%, C<0.02%, N<0.008%, H<0.00155;
Step 2: adopt 3t Single arm that the BT5-1 titan alloy casting ingot after car light in step one is carried out cogging forging, obtain excellent base after air cooling; Described cogging forging adopts the forging mode of axially pulling, is divided into 3 fire and completes, the initial forging temperature of every fire time cogging forging all more than beta transformation point (1020 DEG C) 100 DEG C, and the forging ratio of every fire time cogging forging is 2.5; Total forging ratio of described cogging forging is 7.5;
Step 3: base excellent described in step 2 is carried out sawing according to ring material size, three piers three then adopting 2t Single arm the excellent base after sawing to be carried out 2 fire secondary pull out; Described one-tenth shape forging adopts the forging mode of axial jumping-up commutation pulling, and the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 15 DEG C below, and total forging ratio of described one-tenth shape forging is 6.0.
Step 4: after three piers three pull out described in step 3, BT5-1 rod base through polishing adopts 0.75t air hammer to carry out a pier and pulls out, ring material is forged into again with saddle, the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 25 DEG C below, and total forging ratio of described one-tenth shape forging is 3.5.
Step 5: carry out stress relief annealing with the BT5-1 titanium ring after saddle forging by described in step 4.Annealing temperature is at 800 DEG C, and soaking time is at 1.5h.
Step 6: will carry out the BT5-1 titanium ring after stress relief annealing described in step 5, random rotation direction is materialsed φ 12*110 (3), carries out mechanics properties testing.
Step 7: the BT5-1 titanium ring after stress relief annealing will be carried out described in step 5, and carry out mechanical workout with 30 lathes.
The all excellent tensile strength >=835MPa under room temperature (20 DEG C) condition of the very low temperature mechanical property of the BT5-1 titanium alloy ring material taking the inventive method to prepare and normal temperature mechanical property, yield strength >=770MPa, unit elongation >=15%, relative reduction in area >=35%; Tensile strength >=1450MPa under very low temperature (-253 DEG C) condition, unit elongation >=12%; UT (Ultrasonic Testing) meets A grade standard requirement in standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis ".
Embodiment 2
The preparation method of the present embodiment BT5-1 titanium alloy ring material comprises the following steps:
Step one: adopt the vacuum consumable electrode arc furnace of 1.5t to carry out the melting of BT5-1 titanium ingot; The cross section of described BT5-1 titan alloy casting ingot is diameter is 480mm; Described BT5-1 titan alloy casting ingot carries out 3 meltings by vacuum consumable electrode arc furnace and obtains; In described BT5-1 titan alloy casting ingot, the mass percentage of Sn is 2.5%, the mass percentage of AL is 5.0%, the mass percentage of O is 0.13%, Fe<0.043%, C<0.02%, N<0.008%, H<0.00155;
Step 2: adopt 3t Single arm that the BT5-1 titan alloy casting ingot after car light in step one is carried out cogging forging, obtain excellent base after air cooling; Described cogging forging adopts the forging mode of axially pulling, is divided into 3 fire and completes, the initial forging temperature of every fire time cogging forging all more than beta transformation point (1020 DEG C) 125 DEG C, and the forging ratio of every fire time cogging forging is 3.0; Total forging ratio of described cogging forging is 8.5;
Step 3: base excellent described in step 2 is carried out sawing according to ring material size, three piers three then adopting 2t Single arm the excellent base after sawing to be carried out 2 fire secondary pull out; Described one-tenth shape forging adopts the forging mode of axial jumping-up commutation pulling, and the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 25 DEG C below, and total forging ratio of described one-tenth shape forging is 7.0.
Step 4: after three piers three pull out described in step 3, BT5-1 rod base through polishing adopts 0.75t air hammer to carry out a pier and pulls out, ring material is forged into again with saddle, the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 35 DEG C below, and total forging ratio of described one-tenth shape forging is 4.0.
Step 5: carry out stress relief annealing with the BT5-1 titanium ring after saddle forging by described in step 4.Annealing temperature is at 825 DEG C, and soaking time is at 1.8h.
Step 6: will carry out the BT5-1 titanium ring after stress relief annealing described in step 5, random rotation direction is materialsed φ 12*110 (3), carries out mechanics properties testing.
Step 7: the BT5-1 titanium ring after stress relief annealing will be carried out described in step 5, and carry out mechanical workout with 30 lathes.
The all excellent tensile strength >=835MPa under room temperature (20 DEG C) condition of the very low temperature mechanical property of the BT5-1 titanium alloy ring material taking the inventive method to prepare and normal temperature mechanical property, yield strength >=770MPa, unit elongation >=18%, relative reduction in area >=385%; Tensile strength >=1450MPa under very low temperature (-253 DEG C) condition, unit elongation >=12%; UT (Ultrasonic Testing) meets A grade standard in standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis " and requires embodiment 3
The preparation method of the present embodiment BT5-1 titanium alloy ring material comprises the following steps:
Step one: adopt the vacuum consumable electrode arc furnace of 1.5t to carry out the melting of BT5-1 titanium ingot; The cross section of described BT5-1 titan alloy casting ingot is diameter is 480mm; Described BT5-1 titan alloy casting ingot carries out 3 meltings by vacuum consumable electrode arc furnace and obtains; In described BT5-1 titan alloy casting ingot, the mass percentage of Sn is 2.6%, the mass percentage of AL is 5.1%, the mass percentage of O is 0.15%, Fe<0.043%, C<0.02%, N<0.008%, H<0.00155.
Step 2: adopt 3t Single arm that the BT5-1 titan alloy casting ingot after car light in step one is carried out cogging forging, obtain excellent base after air cooling; Described cogging forging adopts the forging mode of axially pulling, is divided into 4 fire and completes, the initial forging temperature of every fire time cogging forging all more than beta transformation point (1020 DEG C) 150 DEG C, and the forging ratio of every fire time cogging forging is 3.5; Total forging ratio of described cogging forging is 10.0.
Step 3: base excellent described in step 2 is carried out sawing according to ring material size, three piers three then adopting 2t Single arm the excellent base after sawing to be carried out 3 fire secondary pull out; Described one-tenth shape forging adopts the forging mode of axial jumping-up commutation pulling, and the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 35 DEG C below, and total forging ratio of described one-tenth shape forging is 8.0.
Step 4: after three piers three pull out described in step 3, BT5-1 rod base through polishing adopts 0.75t air hammer to carry out a pier and pulls out, ring material is forged into again with saddle, the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 40 DEG C below, and total forging ratio of described one-tenth shape forging is 5.0.
Step 5: carry out stress relief annealing with the BT5-1 titanium ring after saddle forging by described in step 4.Annealing temperature is at 850 DEG C, and soaking time is at 2.0h.
Step 6: will carry out the BT5-1 titanium ring after stress relief annealing described in step 5, random rotation direction is materialsed φ 12*110 (3), carries out mechanics properties testing.
Step 7: the BT5-1 titanium ring after stress relief annealing will be carried out described in step 5, and carry out mechanical workout with 30 lathes.
The all excellent tensile strength >=835MPa under room temperature (20 DEG C) condition of the very low temperature mechanical property of the BT5-1 titanium alloy ring material taking the inventive method to prepare and normal temperature mechanical property, yield strength >=770MPa, unit elongation >=19%, relative reduction in area >=40%; Tensile strength >=1450MPa under very low temperature (-253 DEG C) condition, unit elongation >=15%; UT (Ultrasonic Testing) meets A grade standard requirement in standard GB/T 5193-85 " titanium and its alloy work product defect detection on ultrasonic basis ".
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. a preparation method for BT5-1 titanium alloy ring material, it is characterized in that, the method comprises the following steps:
Step one: adopt the vacuum consumable electrode arc furnace of 1.5t to carry out the melting of BT5-1 titanium ingot; The cross section of described BT5-1 titan alloy casting ingot is diameter is 480mm; Described BT5-1 titan alloy casting ingot carries out 3 meltings by vacuum consumable electrode arc furnace to obtain; In described BT5-1 titan alloy casting ingot, the mass percentage of Sn is 2.4% ~ 2.6%, the mass percentage of Al is 4.9% ~ 5.1%, the mass percentage of O is 0.12% ~ 0.15%, Fe<0.043%, C<0.02%, N<0.008%, H<0.00155;
Step 2: adopt 3t Single arm that the BT5-1 titan alloy casting ingot after car light in step one is carried out cogging forging, obtain excellent base after air cooling; Described cogging forging adopts the forging mode of axially pulling, is divided into 3 ~ 4 fire and completes, the initial forging temperature of every fire time cogging forging all more than beta transformation point (1020 DEG C) 100 DEG C ~ 150 DEG C, and the forging ratio of every fire time cogging forging is 2.5 ~ 3.5; Total forging ratio of described cogging forging is 7.5 ~ 10.0;
Step 3: base excellent described in step 2 is carried out sawing according to ring material size, three piers three then adopting 2t Single arm the excellent base after sawing to be carried out 2 ~ 3 fire secondary pull out; Described one-tenth shape forging adopts the forging mode of axial jumping-up commutation pulling, and the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 15 ~ 35 DEG C below, and total forging ratio of described one-tenth shape forging is 6.0 ~ 8.0;
Step 4: by step 3 after three piers three pull out, the BT5-1 rod base of polishing again adopts 0.75t air hammer to carry out a pier and pulls out, ring material is forged into again with saddle, the initial forging temperature of described one-tenth shape forging is beta transformation point (1020 DEG C) 25 ~ 40 DEG C below, and total forging ratio of described one-tenth shape forging is 3.5 ~ 5.0;
Step 5: carry out stress relief annealing by step 4 with the BT5-1 titanium ring after saddle forging, annealing temperature is at 800 ~ 850 DEG C, and soaking time is at 1.5 ~ 2h;
Step 6: the BT5-1 titanium ring after stress relief annealing will be carried out in step 5, random rotation direction is materialsed φ 12*110,3, carries out mechanics properties testing;
Step 7: the BT5-1 titanium ring after stress relief annealing will be carried out in step 5, and carry out mechanical workout with 30 lathes.
2. the preparation method of a kind of BT5-1 titanium alloy ring material according to claim 1, is characterized in that:
Described Sn allocates into the form of Al-Sn master alloy, can avoid BT5-1 titanium ingot, in vacuum consumable electrode arc furnace, segregation occurs like this.
3. the preparation method of a kind of BT5-1 titanium alloy ring material according to claim 1, is characterized in that:
In step 2, time cogging forging of every fire is divided equally 3 ~ 4 fire and is completed, and the forging ratio of every time cogging forging is 2.5 ~ 3.5, the final forging temperature of every fire time cogging forging all >=850 DEG C.
4. the preparation method of a kind of BT5-1 titanium alloy ring material according to claim 1, is characterized in that:
In step 3, every fire time three piers three pull out forging ratio 1.5 ~ 2.5, every fire time final forging temperature all >=850 DEG C.
5. the preparation method of a kind of BT5-1 titanium alloy ring material according to claim 1, is characterized in that:
Become shape forging to be divided into two passages in step 4 to complete, the first passage advanced row pier pulls out forging ratio and is 3.0 ~ 4.0.; Final forging temperature >=800 DEG C becoming shape forging described in ring are rolled again with saddle forging.
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