CN103909191B - The preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab - Google Patents
The preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab Download PDFInfo
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Abstract
The invention discloses the preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab, the method is: at the bottom of the rising head one, cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale; Two, STi80 titan alloy casting ingot is carried out time cogging forging of 1 ~ 2 fire, air cooling obtains blank to room temperature; Three, blank is carried out time middle forging of 1 ~ 2 fire, air cooling obtains semi-finished product to room temperature; Four, semi-finished product are carried out time finished product forging of 1 ~ 2 fire, air cooling to room temperature obtains naval vessel STi80 diphasic titanium alloy slab.The present invention is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, finally obtain the slab that surface quality is good, lumber recovery is high, the slab even tissue of producing, internal flaw are few, especially for solid foundation established by the sheet material of acquisition high-quality, high yield.
Description
Technical field
The invention belongs to titanium alloy slab preparing technical field, be specifically related to the preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab.
Background technology
Naval vessel STi80 titanium alloy is a kind of alpha and beta type titan alloy, is the anti-corrosion weldable structure titanium alloy of 875MPa level that China develops voluntarily, is applied to the primary structure member of submarine and underawater ordnance, bolt, axle and pressure hull.But this titanium alloy material resistance of deformation in hot procedure is comparatively large, and surface easily occurs crackle, and these factors are disadvantageous to the lumber recovery of product and performance.Therefore seeming very important to the control of process, to the control of its hot procedure and production details, is the key improving product lumber recovery, is also the necessary condition ensureing that its performance is qualified.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides the preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab.The method is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, finally obtain the slab that surface quality is good, lumber recovery is high, slab lumber recovery is up to more than 80%, the slab even tissue of producing, internal flaw are few, especially for solid foundation established by the sheet material of acquisition high-quality, high yield.
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 naval vessel STi80 diphasic titanium alloy slab, and it is characterized in that, the method comprises the following steps:
At the bottom of step one, the rising head cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale;
Step 2, be 1050 DEG C ~ 1150 DEG C by the STi80 titan alloy casting ingot that removes epidermis pore and surface scale in step one at initial forging temperature, under final forging temperature is not less than the condition of 800 DEG C, cogging forging 1 ~ 2 fire is secondary, respectively once, air cooling, to room temperature, obtains blank for every fire time jumping-up and pulling; Control every fire time cumulative deformation in described cogging forging process and be not less than 93%;
Step 3, be 960 DEG C ~ 980 DEG C by blank described in step 2 at initial forging temperature, final forging temperature is not less than forging 1 ~ 2 fire in the middle of under the condition of 800 DEG C, every fire time jumping-up and pulling each once, air cooling obtains semi-finished product to room temperature; Control every fire time cumulative deformation in described middle forging process and be not less than 90%;
Step 4, be 940 DEG C ~ 955 DEG C by semi-finished product described in step 3 at initial forging temperature, final forging temperature is not less than finished product forging 1 ~ 2 fire under the condition of 800 DEG C, and air cooling to room temperature obtains naval vessel STi80 diphasic titanium alloy slab; Control every fire time cumulative deformation in described finished product forging process and be not less than 33%.
The preparation method of above-mentioned a kind of naval vessel STi80 diphasic titanium alloy slab, adopts contact method ultrasonic examination determination rising head position before cutting at the bottom of the rising head of STi80 titan alloy casting ingot and ingot in step one.
The preparation method of above-mentioned a kind of naval vessel STi80 diphasic titanium alloy slab, carry out reconditioning to the crackle on STi80 titan alloy casting ingot after time cogging forging of every fire in step 2, whether reconditioning is thorough then to adopt dyeing inspection determination crackle.
The preparation method of above-mentioned a kind of naval vessel STi80 diphasic titanium alloy slab, remove blank surface oxide skin after time middle forging of every fire in step 3, and carry out reconditioning to blank surface crackle, whether reconditioning is thorough then to adopt dyeing inspection determination crackle.
The preparation method of above-mentioned a kind of naval vessel STi80 diphasic titanium alloy slab, controlling every fire time cumulative deformation in the forging process of finished product described in step 4 is 33% ~ 86%.
The preparation method of above-mentioned a kind of naval vessel STi80 diphasic titanium alloy slab, carry out milling face to semi-finished product after step 4 hollow cold to room temperature.
The present invention compared with prior art has the following advantages:
1, the inventive method is simple, easily realizes suitability for industrialized production.
2, the present invention is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, finally obtains the slab that surface quality is good, lumber recovery is high, slab lumber recovery is up to more than 80%.
3, the slab even tissue adopting the inventive method to produce, internal flaw are few, especially for solid foundation established by the sheet material of acquisition high-quality, high yield.
Below by embodiment, technical scheme of the present invention is described in further detail.
Detailed description of the invention
Embodiment 1
Step one, the ultrasonic examination of employing contact method determine STi80 titan alloy casting ingot rising head position, at the bottom of the rising head cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale, obtain the STi80 titan alloy casting ingot that diameter is Φ 420mm;
Step 2, the cogging that the STi80 titan alloy casting ingot of Φ 420mm in step one is carried out 2 fire secondary are forged, 1st fire time initial forging temperature is 1150 DEG C, by Φ 420mm jumping-up to Φ 700mm, square billet is represented to 450mm(" " again) by Φ 700mm pulling, fire time cumulative deformation 225%, final forging temperature 815 DEG C, carries out local reconditioning after air cooling, and reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough; 2nd fire time initial forging temperature is 1100 DEG C, by 450mm jumping-up to 570mm, then is pulled out to 450mm by 570mm, fire time cumulative deformation 98%, final forging temperature 820 DEG C, carries out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough, obtains blank;
Step 3, be under the condition of 980 DEG C at initial forging temperature by blank described in step 2, middle forging 1 fire, by 450mm jumping-up to 570mm, then pulled out to 450mm by 570mm, fire time cumulative deformation 98%, final forging temperature is 820 DEG C, carry out the removal of integrated oxidation skin with sized flap wheel after air cooling, local thinning surface micro-crack, through dyeing inspection, do not find the face crack do not eliminated, obtain semi-finished product;
Step 4, the finished product that semi-finished product described in step 3 are carried out 2 fire secondary forge, 1st fire time initial forging temperature is 955 DEG C, by 450mm jumping-up to 570mm, axially pulled out to δ 300 × 1000 × Lmm by 570mm again, fire time cumulative deformation 68%, final forging temperature 800 DEG C, carries out local reconditioning with sized flap wheel after air cooling, through dyeing inspection, do not find the face crack do not eliminated; 2nd fire time initial forging temperature is 940 DEG C, pulled out to δ 180 × 1000 × Lmm by δ 300 × 1000 × Lmm, fire time deflection 40%, final forging temperature 800 DEG C, carry out milling face after air cooling, obtain the naval vessel STi80 diphasic titanium alloy slab that surface quality is good, lumber recovery is high.
The present embodiment is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, the slab even tissue of production, internal flaw are few, and slab lumber recovery is up to more than 80%.
Embodiment 2
Step one, the ultrasonic examination of employing contact method determine STi80 titan alloy casting ingot rising head position, at the bottom of the rising head cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale, obtain the STi80 titan alloy casting ingot that diameter is Φ 420mm;
Step 2, the cogging that the STi80 titan alloy casting ingot of Φ 420mm in step one is carried out 1 fire secondary are forged, initial forging temperature is 1150 DEG C, by Φ 420mm jumping-up to Φ 700mm, pulled out to 450mm by Φ 700mm again, fire time cumulative deformation 225%, final forging temperature 805 DEG C, carries out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough, obtains blank;
Step 3, the centre that blank described in step 2 is carried out 2 fire secondary are forged, 1st fire time initial forging temperature is 980 DEG C, by 450mm jumping-up to 560mm, axially pulled out to 450mm by 560mm again, fire time cumulative deformation 90%, final forging temperature 825 DEG C, the removal of integrated oxidation skin is carried out with sized flap wheel after air cooling, local thinning surface micro-crack, through dyeing inspection, does not find the face crack do not eliminated; 2nd fire time initial forging temperature is 960 DEG C, by 450mm jumping-up to 560mm, pulled out to 450mm by 560mm again, fire time cumulative deformation 90%, final forging temperature is 800 DEG C, carries out the removal of integrated oxidation skin after air cooling with sized flap wheel, local thinning surface micro-crack, through dyeing inspection, do not find the face crack do not eliminated, obtain semi-finished product;
Step 4, the finished product that semi-finished product described in step 3 are carried out 1 fire secondary forge, initial forging temperature is 950 DEG C, axially pulled out to δ 300 × 1000 × Lmm by 450mm, fire time deflection 48%, final forging temperature is 800 DEG C, carry out milling face after air cooling, obtain the naval vessel STi80 diphasic titanium alloy slab that surface quality is good, lumber recovery is high.
The present embodiment is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, the slab even tissue of production, internal flaw are few, and slab lumber recovery is up to more than 80%.
Embodiment 3
Step one, the ultrasonic examination of employing contact method determine STi80 titan alloy casting ingot rising head position, at the bottom of the rising head cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale, obtain the STi80 titan alloy casting ingot that diameter is Φ 620mm;
Step 2, the cogging that the STi80 titan alloy casting ingot of Φ 620mm in step one is carried out 2 fire secondary are forged, 1st fire time initial forging temperature is 1150 DEG C, pulled out to 450mm by Φ 620mm, again by 450mm jumping-up to 570mm, fire time cumulative deformation 93%, final forging temperature 800 DEG C, carries out local reconditioning after air cooling, and reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough; 2nd fire time initial forging temperature is 1050 DEG C, is pulled out to 450mm by 570mm, then by 450mm jumping-up to 570mm, fire time cumulative deformation 98%, final forging temperature 812 DEG C, carries out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough, obtains blank;
Step 3, be under the condition of 970 DEG C at initial forging temperature by blank described in step 2, middle forging 1 fire, pulled out to 450mm by 570mm, then by 450mm jumping-up to 570mm, fire time cumulative deformation 98%, final forging temperature is 818 DEG C, carry out the removal of integrated oxidation skin with sized flap wheel after air cooling, local thinning surface micro-crack, through dyeing inspection, do not find the face crack do not eliminated, obtain semi-finished product;
Step 4, the finished product that semi-finished product described in step 3 are carried out 2 fire secondary forge, 1st fire time initial forging temperature is 955 DEG C, pulled out to 450mm by 570mm, axially pulled out to δ 300 × 1000 × Lmm by 450mm again, fire time cumulative deformation 86%, final forging temperature is 808 DEG C, carries out local reconditioning after air cooling with sized flap wheel, through dyeing inspection, do not find the face crack do not eliminated; 2nd fire time initial forging temperature is 950 DEG C, pulled out to δ 200 × 1000 × Lmm by δ 300 × 1000 × Lmm, fire time deflection 33%, final forging temperature is 810 DEG C, carry out milling face after air cooling, obtain the naval vessel STi80 diphasic titanium alloy slab that surface quality is good, lumber recovery is high.
The present embodiment is by progressively reducing the temperature of forging of each stage, control fire time and the fire time cumulative deformation of the forging of each stage, can ensure that in process, serious cracking does not occur slab, the slab even tissue of production, internal flaw are few, and slab lumber recovery is up to more than 80%.
The above; it is only preferred embodiment of the present invention; not any restriction is done to the present invention, every above embodiment is done according to invention technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (6)
1. a naval vessel preparation method for STi80 diphasic titanium alloy slab, it is characterized in that, the method comprises the following steps:
At the bottom of step one, the rising head cutting STi80 titan alloy casting ingot and ingot, removing STi80 titan alloy casting ingot epidermis pore and surface scale;
Step 2, be 1050 DEG C ~ 1150 DEG C by the STi80 titan alloy casting ingot that removes epidermis pore and surface scale in step one at initial forging temperature, under final forging temperature is not less than the condition of 800 DEG C, cogging forging 1 ~ 2 fire is secondary, respectively once, air cooling, to room temperature, obtains blank for every fire time jumping-up and pulling; Control every fire time cumulative deformation in described cogging forging process and be not less than 93%;
Step 3, be 960 DEG C ~ 980 DEG C by blank described in step 2 at initial forging temperature, final forging temperature is not less than forging 1 ~ 2 fire in the middle of under the condition of 800 DEG C, every fire time jumping-up and pulling each once, air cooling obtains semi-finished product to room temperature; Control every fire time cumulative deformation in described middle forging process and be not less than 90%;
Step 4, be 940 DEG C ~ 955 DEG C by semi-finished product described in step 3 at initial forging temperature, final forging temperature is not less than finished product forging 1 ~ 2 fire under the condition of 800 DEG C, and air cooling to room temperature obtains naval vessel STi80 diphasic titanium alloy slab; Control every fire time cumulative deformation in described finished product forging process and be not less than 33%.
2. the preparation method of a kind of naval vessel according to claim 1 STi80 diphasic titanium alloy slab, is characterized in that, adopts contact method ultrasonic examination determination rising head position before cutting at the bottom of the rising head of STi80 titan alloy casting ingot and ingot in step one.
3. the preparation method of a kind of naval vessel according to claim 1 STi80 diphasic titanium alloy slab, it is characterized in that, carry out reconditioning to the crackle on STi80 titan alloy casting ingot after time cogging forging of every fire in step 2, whether reconditioning is thorough then to adopt dyeing inspection determination crackle.
4. the preparation method of a kind of naval vessel according to claim 1 STi80 diphasic titanium alloy slab, it is characterized in that, remove blank surface oxide skin after time middle forging of every fire in step 3, and carry out reconditioning to blank surface crackle, whether reconditioning is thorough then to adopt dyeing inspection determination crackle.
5. the preparation method of a kind of naval vessel according to claim 1 STi80 diphasic titanium alloy slab, is characterized in that, controlling every fire time cumulative deformation in the forging process of finished product described in step 4 is 33% ~ 86%.
6. the preparation method of a kind of naval vessel according to claim 1 STi80 diphasic titanium alloy slab, is characterized in that, carry out milling face after step 4 hollow cold to room temperature to semi-finished product.
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| 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 |
| CN114210898B (en) * | 2021-12-06 | 2024-02-13 | 陕西宏远航空锻造有限责任公司 | Preparation method of high-strength high-toughness damage tolerance type titanium alloy bolt forging |
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| DE2022293A1 (en) * | 1969-05-07 | 1970-11-19 | Iit Res Inst | Process for deforming titanium and titanium alloys |
| CN1061047A (en) * | 1990-11-02 | 1992-05-13 | 西北有色金属研究院 | Marine titanium alloy and manufacture method |
| CN101139670A (en) * | 2007-10-17 | 2008-03-12 | 西北有色金属研究院 | Technique for processing titanium alloy sheet material |
| CN102319853A (en) * | 2011-08-16 | 2012-01-18 | 西部钛业有限责任公司 | Production method for TA19 titanium alloy strip |
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