CN103909191A - Method for manufacturing STi80 two-phase titanium alloy plate blanks for ships - Google Patents
Method for manufacturing STi80 two-phase titanium alloy plate blanks for ships Download PDFInfo
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Abstract
The invention discloses a method for manufacturing STi80 two-phase titanium alloy plate blanks for ships. The method includes firstly, cutting off risers and ingot bottoms of STi80 titanium alloy cast ingots, and removing skin air holes and surface scales of the STi80 titanium alloy cast ingots; secondly, performing cogging and forging on the STi80 titanium alloy cast ingots by 1-2 heating numbers, and cooling the STi80 titanium alloy cast ingots by the aid of air until the temperatures of the STi80 titanium alloy cast ingots reach the room temperature so as to obtain blanks; thirdly, intermediately forging the blanks by 1-2 heating numbers, and cooling the blanks by the aid of air until the temperatures of the blanks reach the room temperature so as to obtain semi-finished products; fourthly, performing finished product forging on the semi-finished products by 1-2 heating numbers, and cooling the semi-finished products by the aid of air until the temperatures of the semi-finished products reach the room temperature so as to obtain the STi80 two-phase titanium alloy plate blanks for the ships. The method has the advantages that the forging temperatures are gradually reduced at various stages, the forging heating numbers of the various stages and heating number accumulated deformation are controlled, accordingly, the plate blanks can be guaranteed against severely cracking in machining procedures, and the finally obtained plate blanks are excellent in surface quality and high in yield; the plate blanks produced by the aid of the method are uniform in texture and have few internal defects, and a solid foundation is particularly laid for manufacturing plates which are high in quality and 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 is a kind of alpha and beta type titan alloy with STi80 titanium alloy, is the anti-corrosion weldable structure titanium alloy of 875MPa level that China develops voluntarily, is applied to primary structure member, bolt, axle and the pressure hull of submarine and underawater ordnance.But this titanium alloy material resistance of deformation in hot procedure is larger, and surface is prone to crackle, lumber recovery and the performance of these factors to product is disadvantageous.Therefore the control of process being seemed to very important, to the control of its hot procedure and production details, is the key that improves product lumber recovery, is also to guarantee the qualified necessary condition of its performance.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and the preparation method of a kind of naval vessel STi80 diphasic titanium alloy slab is provided.The method is by progressively reducing the temperature of each stage forging, control fire that each stage forges time and fire time cumulative deformation, can guarantee 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%, slab even tissue, the internal flaw of producing are few, especially for the sheet material that obtains high-quality, high yield has been established solid foundation.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel, it is characterized in that, and the method comprises the following steps:
Step 1, cut the rising head and ingot of STi80 titan alloy casting ingot at the bottom of, remove STi80 titan alloy casting ingot epidermis pore and surface scale;
Step 2, be 1050 ℃～1150 ℃ by the STi80 titan alloy casting ingot of removing epidermis pore and surface scale in step 1 at initial forging temperature, final forging temperature is not less than cogging under the condition of 800 ℃ and forges 1～2 fire, respectively once, air cooling, to room temperature, obtains blank for every fire time jumping-up and pulling; In described cogging forging process, control every fire time cumulative deformation and be not less than 93%;
Step 3, be 960 ℃～980 ℃ by blank described in step 2 at initial forging temperature, final forging temperature is forged 1～2 fire in the middle of being not less than under the condition of 800 ℃, and respectively once, air cooling to room temperature obtains semi-finished product for every fire time jumping-up and pulling; In the middle of described, in forging process, control every fire time cumulative deformation and be not less than 90%;
Step 4, be 940 ℃～955 ℃ by semi-finished product described in step 3 at initial forging temperature, final forging temperature is not less than finished product under the condition of 800 ℃ and forges 1～2 fire, and air cooling to room temperature obtains naval vessel STi80 diphasic titanium alloy slab; In described finished product forging process, control every fire time cumulative deformation and be not less than 33%.
The preparation method of STi80 diphasic titanium alloy slab for above-mentioned a kind of naval vessel, adopts contact method ultrasonic examination to determine rising head position before cutting at the bottom of the rising head of STi80 titan alloy casting ingot and ingot in step 1.
The preparation method of STi80 diphasic titanium alloy slab for above-mentioned a kind of naval vessel, in step 2, time cogging of every fire is carried out reconditioning to the crackle on STi80 titan alloy casting ingot after forging, and whether reconditioning is thorough then to adopt dyeing inspection to determine crackle.
The preparation method of STi80 diphasic titanium alloy slab for above-mentioned a kind of naval vessel, removes blank surface oxide skin after every fire time middle forging in step 3, and blank surface crackle is carried out to reconditioning, and whether reconditioning is thorough then to adopt dyeing inspection to determine crackle.
The preparation method of STi80 diphasic titanium alloy slab for above-mentioned a kind of naval vessel, in the forging process of finished product described in step 4, controlling every fire time cumulative deformation is 33%～86%.
The preparation method of STi80 diphasic titanium alloy slab for above-mentioned a kind of naval vessel, step 4 hollow cold carry out milling face to semi-finished product 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 each stage forging, control fire that each stage forges time and fire time cumulative deformation, can guarantee 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%.
3, the slab even tissue, the internal flaw that adopt the inventive method to produce are few, especially for the sheet material that obtains high-quality, high yield has been established solid foundation.
Below by embodiment, technical scheme of the present invention is described in further detail.
The specific embodiment
Embodiment 1
STi80 titan alloy casting ingot rising head position is determined in step 1, the ultrasonic examination of employing contact method, at the bottom of cutting the rising head and ingot of STi80 titan alloy casting ingot, remove STi80 titan alloy casting ingot epidermis pore and surface scale, obtaining diameter is the STi80 titan alloy casting ingot of Φ 420mm;
Step 2, by the STi80 titan alloy casting ingot of Φ 420mm in step 1 carry out 2 fire time coggings forge, the 1st fire time initial forging temperature is 1150 ℃, by Φ 420mm jumping-up to Φ 700mm, pull out to 450mm(" " and represent square billet by Φ 700mm again), fire time cumulative deformation 225%, 815 ℃ of final forging temperatures, carry out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough; The 2nd fire time initial forging temperature is 1100 ℃, to 570mm, then pulls out the 450mm to by 570mm by 450mm jumping-up, fire time cumulative deformation 98%, 820 ℃ of final forging temperatures, carry 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 ℃ at initial forging temperature by blank described in step 2, middle 1 fire that forges, to 570mm, then pull out the 450mm to by 570mm by 450mm jumping-up, fire time cumulative deformation 98%, final forging temperature is 820 ℃, after air cooling, carry out the removal of integrated oxidation skin with sized flap wheel, local reconditioning crizzle, through dyeing inspection, do not find the face crack not eliminating, obtain semi-finished product;
Step 4, by semi-finished product described in step 3 carry out 2 fire time finished products forge, the 1st fire time initial forging temperature is 955 ℃, by 450mm jumping-up to 570mm, axially pull out 300 × 1000 × Lmm to δ by 570mm again, fire time cumulative deformation 68%, 800 ℃ of final forging temperatures, carry out local reconditioning with sized flap wheel after air cooling, through dyeing inspection, do not find the face crack not eliminating; The 2nd fire time initial forging temperature is 940 ℃, pull out 180 × 1000 × Lmm to δ by δ 300 × 1000 × Lmm, fire time deflection 40%, 800 ℃ of final forging temperatures, after air cooling, carry out milling face, 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 each stage forging, control fire that each stage forges time and fire time cumulative deformation, can guarantee 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
STi80 titan alloy casting ingot rising head position is determined in step 1, the ultrasonic examination of employing contact method, at the bottom of cutting the rising head and ingot of STi80 titan alloy casting ingot, remove STi80 titan alloy casting ingot epidermis pore and surface scale, obtaining diameter is the STi80 titan alloy casting ingot of Φ 420mm;
Step 2, by the STi80 titan alloy casting ingot of Φ 420mm in step 1 carry out 1 fire time cogging forge, initial forging temperature is 1150 ℃, by Φ 420mm jumping-up to Φ 700mm, pull out the 450mm to by Φ 700mm again, fire time cumulative deformation 225%, 805 ℃ of final forging temperatures, carry out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough, obtains blank;
Step 3, by blank described in step 2 carry out 2 fire time in the middle of forge, the 1st fire time initial forging temperature is 980 ℃, by 450mm jumping-up to 560mm, axially pull out the 450mm to by 560mm again, fire time cumulative deformation 90%, 825 ℃ of final forging temperatures, after air cooling, carry out the removal of integrated oxidation skin with sized flap wheel, local reconditioning crizzle, through dyeing inspection, does not find the face crack not eliminating; The 2nd fire time initial forging temperature is 960 ℃, by 450mm jumping-up to 560mm, pull out the 450mm to by 560mm again, fire time cumulative deformation 90%, final forging temperature is 800 ℃, after air cooling, carries out the removal of integrated oxidation skin with sized flap wheel, local reconditioning crizzle, through dyeing inspection, the face crack that discovery does not eliminate, obtains semi-finished product;
Step 4, by semi-finished product described in step 3 carry out 1 fire time finished product forge, initial forging temperature is 950 ℃, axially pull out 300 × 1000 × Lmm to δ by 450mm, fire time deflection 48%, final forging temperature is 800 ℃, after air cooling, carry out milling face, 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 each stage forging, control fire that each stage forges time and fire time cumulative deformation, can guarantee 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
STi80 titan alloy casting ingot rising head position is determined in step 1, the ultrasonic examination of employing contact method, at the bottom of cutting the rising head and ingot of STi80 titan alloy casting ingot, remove STi80 titan alloy casting ingot epidermis pore and surface scale, obtaining diameter is the STi80 titan alloy casting ingot of Φ 620mm;
Step 2, by the STi80 titan alloy casting ingot of Φ 620mm in step 1 carry out 2 fire time coggings forge, the 1st fire time initial forging temperature is 1150 ℃, pull out the 450mm to by Φ 620mm, again by 450mm jumping-up to 570mm, fire time cumulative deformation 93%, 800 ℃ of final forging temperatures, carry out local reconditioning after air cooling, reconditioning completes after stain inspection confirmation crackle, and reconditioning is thorough; The 2nd fire time initial forging temperature is 1050 ℃, pulls out the 450mm to by 570mm, then by 450mm jumping-up to 570mm, fire time cumulative deformation 98%, 812 ℃ of final forging temperatures, carry 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 ℃ at initial forging temperature by blank described in step 2, middle 1 fire that forges, pull out the 450mm to by 570mm, then by 450mm jumping-up to 570mm, fire time cumulative deformation 98%, final forging temperature is 818 ℃, after air cooling, carry out the removal of integrated oxidation skin with sized flap wheel, local reconditioning crizzle, through dyeing inspection, do not find the face crack not eliminating, obtain semi-finished product;
Step 4, by semi-finished product described in step 3 carry out 2 fire time finished products forge, the 1st fire time initial forging temperature is 955 ℃, pull out the 450mm to by 570mm, axially pull out 300 × 1000 × Lmm to δ by 450mm again, fire time cumulative deformation 86%, final forging temperature is 808 ℃, after air cooling, carries out local reconditioning with sized flap wheel, through dyeing inspection, do not find the face crack not eliminating; The 2nd fire time initial forging temperature is 950 ℃, pull out 200 × 1000 × Lmm to δ by δ 300 × 1000 × Lmm, fire time deflection 33%, final forging temperature is 810 ℃, after air cooling, carry out milling face, 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 each stage forging, control fire that each stage forges time and fire time cumulative deformation, can guarantee 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 the present invention is done to any restriction, every any simple modification of above embodiment being done according to invention technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
Claims (6)
1. a preparation method for STi80 diphasic titanium alloy slab for naval vessel, is characterized in that, the method comprises the following steps:
Step 1, cut the rising head and ingot of STi80 titan alloy casting ingot at the bottom of, remove STi80 titan alloy casting ingot epidermis pore and surface scale;
Step 2, be 1050 ℃～1150 ℃ by the STi80 titan alloy casting ingot of removing epidermis pore and surface scale in step 1 at initial forging temperature, final forging temperature is not less than cogging under the condition of 800 ℃ and forges 1～2 fire, respectively once, air cooling, to room temperature, obtains blank for every fire time jumping-up and pulling; In described cogging forging process, control every fire time cumulative deformation and be not less than 93%;
Step 3, be 960 ℃～980 ℃ by blank described in step 2 at initial forging temperature, final forging temperature is forged 1～2 fire in the middle of being not less than under the condition of 800 ℃, and respectively once, air cooling to room temperature obtains semi-finished product for every fire time jumping-up and pulling; In the middle of described, in forging process, control every fire time cumulative deformation and be not less than 90%;
Step 4, be 940 ℃～955 ℃ by semi-finished product described in step 3 at initial forging temperature, final forging temperature is not less than finished product under the condition of 800 ℃ and forges 1～2 fire, and air cooling to room temperature obtains naval vessel STi80 diphasic titanium alloy slab; In described finished product forging process, control every fire time cumulative deformation and be not less than 33%.
2. the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel according to claim 1, is characterized in that, adopts contact method ultrasonic examination to determine rising head position before cutting at the bottom of the rising head of STi80 titan alloy casting ingot and ingot in step 1.
3. the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel according to claim 1, it is characterized in that, in step 2, time cogging of every fire is carried out reconditioning to the crackle on STi80 titan alloy casting ingot after forging, and whether reconditioning is thorough then to adopt dyeing inspection to determine crackle.
4. the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel according to claim 1, it is characterized in that, in step 3, after every fire time middle forging, remove blank surface oxide skin, and blank surface crackle is carried out to reconditioning, whether reconditioning is thorough then to adopt dyeing inspection to determine crackle.
5. the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel according to claim 1, is characterized in that, in the forging process of finished product described in step 4, controlling every fire time cumulative deformation is 33%～86%.
6. the preparation method of STi80 diphasic titanium alloy slab for a kind of naval vessel according to claim 1, is characterized in that, step 4 hollow cold carry out milling face to semi-finished product to room temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112264566A (en) * | 2020-09-22 | 2021-01-26 | 宝鸡钛业股份有限公司 | Processing method of large-scale hot-strength titanium alloy forging |
| CN114210898A (en) * | 2021-12-06 | 2022-03-22 | 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112264566A (en) * | 2020-09-22 | 2021-01-26 | 宝鸡钛业股份有限公司 | Processing method of large-scale hot-strength titanium alloy forging |
| 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 |
| CN114210898A (en) * | 2021-12-06 | 2022-03-22 | 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 |
| 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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