CN115476116A - Preparation method of ultra-long titanium alloy plate - Google Patents
Preparation method of ultra-long titanium alloy plate Download PDFInfo
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- CN115476116A CN115476116A CN202211135337.4A CN202211135337A CN115476116A CN 115476116 A CN115476116 A CN 115476116A CN 202211135337 A CN202211135337 A CN 202211135337A CN 115476116 A CN115476116 A CN 115476116A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 263
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000005098 hot rolling Methods 0.000 claims abstract description 48
- 238000003466 welding Methods 0.000 claims abstract description 36
- 239000011265 semifinished product Substances 0.000 claims abstract description 35
- 238000003754 machining Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 39
- 230000003746 surface roughness Effects 0.000 claims description 8
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 3
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000004513 sizing Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005096 rolling process Methods 0.000 description 14
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- 238000010998 test method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
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- 238000005242 forging Methods 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
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- 229910052786 argon Inorganic materials 0.000 description 1
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Abstract
The invention discloses a preparation method of an ultralong titanium alloy plate, which comprises the following steps: 1. carrying out sizing processing on the multiple titanium alloy plate blanks to obtain multiple titanium alloy first plate blanks; 2. respectively machining two ends of the multiple first titanium alloy slabs to obtain multiple second titanium alloy slabs; 3. sequentially combining and splicing a plurality of titanium alloy second plate blanks in a head-to-tail connection mode, and then sequentially performing spot welding fixing and seal welding at the combined and spliced boundary to obtain a titanium alloy plate blank semi-finished product; 4. and carrying out hot rolling treatment to obtain the ultra-long titanium alloy plate. According to the invention, the head parts and the tail parts of the two ends of the second titanium alloy plate blank are processed into the convex shapes and the concave shapes which are matched with each other, so that the second titanium alloy plate blank is efficiently combined and spliced in a head-to-tail connection mode, the length of a semi-finished product of the titanium alloy plate blank is effectively increased, the limits of the size of an ingot and the capacity of smelting equipment are broken through, and the preparation of the ultralong titanium alloy plate blank is realized.
Description
Technical Field
The invention belongs to the technical field of titanium alloy plate processing, and particularly relates to a preparation method of an ultralong titanium alloy plate.
Background
Titanium and titanium alloy have the characteristics of small density, high specific strength, good corrosion resistance and processability and the like, and are widely applied to national key projects such as aerospace, rail transit, ship manufacturing and the like. In recent years, with the upgrade of national defense military equipment and the rapid development of lightweight in the manufacturing field, the application requirements of titanium and titanium alloy materials are further expanded, which provides clear requirements for the production and preparation of large-specification titanium alloy plates.
The preparation method of titanium alloy plates has been gradually matured, and is generally obtained by forging and rolling an ingot obtained by vacuum consumable arc melting, i.e. ingot melting → ingot forging to obtain a slab → slab rolling. However, the specification of the plate is limited by the size of the cast ingot, so that the large-specification titanium alloy plate, especially the ultra-long titanium alloy plate, is difficult to produce, and the realization of the continuous production of the plate preparation is a technical difficulty in the field. This is mainly due to: 1. the size of the cast ingot is limited by the smelting equipment; 2. the components are easy to segregate in the process of large cast ingot solidification, so that the structure performance of the plate is not uniform. Therefore, the single weight of the ingot melted at present does not exceed five tons. This limits the production process of the ultra-long titanium alloy sheet. Therefore, it is necessary to design and develop a preparation technology of an ultra-long titanium alloy plate and realize the flow production of the titanium alloy plate.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for preparing an ultra-long titanium alloy plate aiming at the defects of the prior art. According to the invention, the head and the tail of the two ends of the second titanium alloy plate blank are processed into the convex shape and the concave shape which are matched with each other, so that the second titanium alloy plate blank is efficiently combined and spliced in a head-to-tail connection mode, the length of a semi-finished product of the titanium alloy plate blank is effectively increased, the preparation of the ultralong titanium alloy plate blank is realized, and the problem of uneven plate structure performance caused by easy segregation of components in the solidification process of a large ingot when the ultralong titanium alloy plate is prepared by adopting the large ingot is solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the preparation method of the ultralong titanium alloy plate is characterized by comprising the following steps:
step one, carrying out sizing processing on a plurality of titanium alloy plate blanks to obtain a plurality of titanium alloy first plate blanks; the widths and the thicknesses of the multiple titanium alloy first plate blanks are equal;
step two, respectively machining the head and the tail of the multiple titanium alloy first plate blanks obtained in the step one to obtain multiple titanium alloy second plate blanks; the head and the tail of the plurality of titanium alloy second slabs are provided with an outer convex shape and an inner concave shape which are matched with each other;
step three, sequentially combining and splicing the plurality of titanium alloy second slabs obtained in the step two in a head-to-tail connection mode, enabling the convex heads of the titanium alloy second slabs and the concave tails of adjacent titanium alloy second slabs to be mutually matched and connected, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundaries to obtain titanium alloy slab semi-finished products;
and step four, carrying out hot rolling treatment on the titanium alloy plate blank semi-finished product obtained in the step three to obtain the ultra-long titanium alloy plate.
According to the method, two ends of the first titanium alloy plate blank subjected to fixed-length machining are machined respectively to obtain the second titanium alloy plate blank, plate blank cutting equipment such as a sawing machine, a plate shearing machine and a water jet cutter can be selected for the fixed-length machining, machining equipment such as a milling machine, a sawing machine and a millstone polishing can be selected for the machining, the head and tail ends of a plurality of second titanium alloy plate blanks are designed into an outer convex shape and an inner concave shape which are matched with each other, so that the second titanium alloy plate blanks are efficiently combined and spliced in a head-tail connection mode, and the combined and spliced positions are subjected to spot welding and sealing welding to obtain the semi-finished titanium alloy plate blanks. Theoretically, the method can carry out combination splicing, spot welding fixing and seal welding on the unlimited number of the second titanium alloy plate blanks to obtain the semi-finished titanium alloy plate blanks, and the ultra-long titanium alloy plates with unlimited length can be obtained through hot rolling treatment.
The preparation method of the ultralong titanium alloy plate is characterized in that in the second step, the number of the plurality of first titanium alloy plate blanks is more than 2.
The preparation method of the ultralong titanium alloy plate is characterized in that the head parts and the tail parts of the two ends of the plurality of second titanium alloy plate blanks in the second step are correspondingly identical and are respectively in a convex shape and a concave shape which are matched with each other. The convex and concave structures are small in processing difficulty and easy to realize, are beneficial to combined connection between the titanium alloy second plate blanks, are accurate in positioning and are convenient to connect; meanwhile, when the convex ">" shaped head part of the titanium alloy second plate blank and the concave ">" shaped tail part of the adjacent titanium alloy second plate blank are matched with each other for combination and splicing, the concave ">" shaped structure has a coating effect on the convex ">" shaped structure, and the concave head is selected to be firstly bitten in combination with hot rolling, so that the head part and the tail part of the spliced part are effectively prevented from slipping in the rolling process, the uniform dispersion of rolling force is facilitated, the joint cracking in the rolling deformation process of the titanium alloy plate blank semi-finished product is facilitated to be prevented, and the bonding strength at the spliced interface is improved; in addition, the convex and concave matching mode effectively improves the contact area of the plate blank splicing head, is beneficial to the plastic flow of interface metal in the rolling deformation process, increases the connection reliability and improves the quality of the ultralong titanium alloy plate.
The preparation method of the ultralong titanium alloy plate is characterized in that the included angle of the convex shape and the included angle of the concave shape are both 30-45 degrees, and the surface roughness Ra is less than or equal to 6.3. Different from the existing direct butt welding mode of the plate blanks, the invention increases the length of two sides forming an included angle in the outward-convex ">" shape and the inward-concave "<" shape by controlling the included angle of the outward-convex ">" shape and the inward-concave "<" shape to be 30-45 degrees, further increases the contact area of the head part of the outward-convex ">" shape of the titanium alloy second plate blank and the tail part of the inward-concave "<" shape of the adjacent titanium alloy second plate blank, further enhances the clamping effect of the inward-concave "<" shape structure on the outward-convex ">" shape structure, and is beneficial to ensuring the connection strength between the titanium alloy second plate blanks.
The preparation method of the ultra-long titanium alloy plate is characterized in that the welding mode of the seal welding in the third step is vacuum electron beam welding. The invention adopts vacuum electron beam welding to accurately determine the position of the welding line, reduces the repeatability error of welding, and improves the welding efficiency, in particular to the welding efficiency of the second plate blank of the large-thickness titanium alloy. Generally, the spot welding method of the present invention adopts argon arc welding or laser welding.
The preparation method of the ultra-long titanium alloy plate is characterized in that the number of passes of the hot rolling treatment in the fourth step is more than 2. According to the invention, the deformation of the titanium alloy plate blank semi-finished product is improved by controlling the number of passes of hot rolling treatment, so that the joint combination at the splicing part is facilitated, the connection strength of the joint is ensured, and the performance uniformity of the product ultra-long titanium alloy plate is improved.
The preparation method of the ultra-long titanium alloy plate is characterized in that the hot rolling deformation of the hot rolling treatment in the fourth step is 50-80%. The invention controls the plastic deformation degree of the metal at the splicing joint by controlling the hot rolling deformation amount, thereby realizing the effective combination of the joint.
The preparation method of the ultra-long titanium alloy plate is characterized in that in the fourth step, the feeding direction of the titanium alloy plate blank semi-finished product in the hot rolling treatment process is concave, and the tail part of the titanium alloy plate blank semi-finished product is firstly bitten. According to the acceptance analysis, the feeding mode is favorable for preventing the splicing joints between the titanium alloy second plate blanks in the titanium alloy plate blank semi-finished products from cracking in the hot rolling process, and the bonding strength at the splicing interface is improved.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the head and the tail of the two ends of the second titanium alloy plate blank are processed into the convex shape and the concave shape which are matched with each other, so that the second titanium alloy plate blank is efficiently combined and spliced in a head-to-tail connection mode, the length of a semi-finished product of the titanium alloy plate blank is effectively increased, the preparation of the ultralong titanium alloy plate blank is realized, and the problem of uneven plate structure performance caused by easy segregation of components in the solidification process of a large ingot when the ultralong titanium alloy plate is prepared by adopting the large ingot is solved.
2. Aiming at the problem that the length of the titanium alloy plate is limited by the ingot casting specification, the invention realizes the preparation of the ultra-long titanium alloy plate blank by combining and splicing the processed titanium alloy plate blank without improving the ingot casting specification of the prepared titanium alloy plate blank, realizes the production of the ultra-long titanium alloy plate through a small ingot casting without being limited by smelting equipment, has easily controlled component structure of the small ingot casting, is more convenient for smelting, forging and transporting, and is beneficial to improving the preparation efficiency of the ultra-long titanium alloy plate.
3. Compared with the method for connecting cast ingots by adopting a simple butt welding process to realize the preparation of the ultralong titanium alloy plate, the method has the advantages that the combined splicing of the processed titanium alloy plate blanks is high in connection strength, good in stability and compact in combination between the plate blanks, and the quality of the ultralong titanium alloy plate obtained after hot rolling treatment is improved.
4. The preparation of the ultralong titanium alloy plate breaks through the limitation of the size of an ingot and the capacity of smelting equipment, provides a new idea for the effective utilization of titanium alloy small scrap, and realizes the reutilization of a plurality of small blanks to produce the large-size titanium alloy plate.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a process flow diagram for preparing the ultra-long titanium alloy plate.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment includes the following steps:
step one, respectively carrying out fixed length processing on 3 titanium alloy slabs which are forged from a titanium alloy ingot and have the size specifications of (length, width and thickness) 232.2mm, 221.3mm, 200mm, (length, width and thickness) 231.4mm, 217.5mm, 200mm and (length, width and thickness) 234.3mm, 208.9mm and 200mm by using a sawing machine to obtain 3 first titanium alloy slabs with the size specifications of (length, width and thickness) 200mm, 200mm and 200 mm;
step two, respectively machining the head and the tail of the 3 titanium alloy first plate blanks obtained in the step one by using a sawing machine to obtain 3 titanium alloy second plate blanks, wherein the head of the first titanium alloy second plate blank is straight, the tail of the first titanium alloy second plate blank is concave and is in a positive convex shape, the tail of the second titanium alloy second plate blank is concave and is in a positive convex shape, corresponding to Y and X in the figure 1, the head of the third titanium alloy second plate blank is convex and is in a positive convex shape, the tail of the third titanium alloy second plate blank is straight, the included angles of the concave and convex shapes in the 3 titanium alloy second plate blanks are both 30 degrees, and the surface roughness Ra of the machined surface of the plate blank subjected to polishing by a thousand-blade wheel is less than or equal to 6.3;
step three, sequentially combining and splicing the 3 sheets of titanium alloy second plate blanks obtained in the step two in a head-to-tail connection mode, enabling the tail part of the first sheet of titanium alloy second plate blank to be concave in shape and the head part of the second sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, enabling the concave in shape and the tail part of the second sheet of titanium alloy second plate blank to be concave in shape and the head part of the third sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundary to enable the 3 sheets of titanium alloy second plate blanks to be fixedly connected to obtain a titanium alloy plate blank semi-finished product;
step four, putting the semi-finished product of the titanium alloy plate blank obtained in the step three into a heating furnace, preserving heat for 200min at 1150 ℃, discharging the semi-finished product of the titanium alloy plate blank out of the furnace, and carrying out primary hot rolling treatment, wherein the concave-shaped tail of the semi-finished product of the titanium alloy plate blank is firstly bitten in the primary hot rolling treatment process, the deformation of the primary hot rolling is 50 percent, so that a primary rolled plate blank with the dimension specification of (length, width and thickness) 2400mm multiplied by 200mm multiplied by 50mm is obtained, then putting the primary rolled plate blank into the heating furnace, preserving heat for 150min at 950 ℃, discharging the plate blank out of the furnace, carrying out secondary hot rolling treatment, the concave-shaped tail of the primary rolled plate blank is firstly bitten in the secondary hot rolling treatment process, the deformation of the secondary hot rolling is 75 percent, so that an ultra-long titanium alloy plate with the dimension specification of (length, width and thickness) 8000mm multiplied by 200mm multiplied by 15mm is obtained
GB/T228.1-2010 metallic Material tensile test part 1 is adopted: the method for testing the tensile properties in the room temperature test method includes sampling samples at the boundary joints between the middle of the ultra-long titanium alloy plate and the combined splice along the rolling direction of the ultra-long titanium alloy plate in the embodiment, and performing mechanical property tests, wherein the results are shown in table 1.
Table 1 mechanical properties of ultra-long titanium alloy sheet prepared in example 1
As can be seen from table 1, the tensile strength and yield strength of the boundary joint in the ultra-long titanium alloy plate prepared in this embodiment are both higher than the intermediate tensile strength, the elongation after fracture is consistent with the intermediate position, and the elongation after fracture is only less than 3% of the intermediate position, which indicates that the method of the present invention realizes effective connection of titanium alloy plate blanks, and the ultra-long titanium alloy plate has uniform mechanical properties, thereby realizing preparation of the ultra-long titanium alloy plate.
Comparative example 1
The comparative example comprises the following steps:
step one, respectively carrying out fixed length processing on 3 titanium alloy slabs which are forged from a titanium alloy ingot and have the dimensions of (length, width and thickness) 243.2mm, 212.3mm, 200mm, (length, width and thickness) 251.1mm, 209.2mm, 200mm and (length, width and thickness) 234.3mm, 208.9mm and 200mm by using a sawing machine to obtain 3 first titanium alloy slabs with the dimensions of (length, width and thickness) 231.1mm, 210.9mm and 200 mm;
step two, respectively machining the head and the tail of the 3 titanium alloy first plate blanks obtained in the step one by using a sawing machine to obtain 3 titanium alloy second plate blanks, wherein the head of the first titanium alloy second plate blank is straight, the tail of the first titanium alloy second plate blank is concave in shape, the head of the second titanium alloy second plate blank is convex in shape, the tail of the second titanium alloy second plate blank is concave in shape, the head of the third titanium alloy second plate blank is convex in shape, the tail of the third titanium alloy second plate blank is straight, the included angles of the concave in shape and the convex in shape in the 3 titanium alloy second plate blanks are both 30 degrees, and the surface roughness Ra of the machined surface by using a millstone wheel is less than or equal to 6.3;
step three, sequentially combining and splicing the 3 sheets of titanium alloy second plate blanks obtained in the step two in a head-to-tail connection mode, enabling the tail part of the first sheet of titanium alloy second plate blank to be concave in shape and the head part of the second sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, enabling the concave in shape and the tail part of the second sheet of titanium alloy second plate blank to be concave in shape and the head part of the third sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundary to enable the 3 sheets of titanium alloy second plate blanks to be fixedly connected to obtain a titanium alloy plate blank semi-finished product;
step four, putting the semi-finished product of the titanium alloy plate blank obtained in the step three into a heating furnace, preserving heat for 200min at 1150 ℃, discharging the semi-finished product of the titanium alloy plate blank out of the furnace, and carrying out primary hot rolling treatment, wherein the convex head of the semi-finished product of the titanium alloy plate blank is firstly bitten in the primary hot rolling treatment process, the deformation of the primary hot rolling is 50%, so as to obtain a primary rolled plate blank with the dimension specification of (length, width and thickness) 2400mm multiplied by 200mm multiplied by 50mm, then putting the primary rolled plate blank into the heating furnace, preserving heat for 150min at 950 ℃, discharging the plate blank out of the furnace, carrying out secondary hot rolling treatment, wherein the concave tail of the primary rolled plate blank is firstly bitten in the secondary hot rolling treatment process, the deformation of the secondary hot rolling is 75%, so as to obtain an ultralong titanium alloy plate with the dimension specification of (length, width and thickness) 8000mm multiplied by 200mm multiplied by 15mm
GB/T228.1-2010 part 1 of the metal material tensile test is adopted: the method for testing the tensile property in the room temperature test method includes sampling the middle of the plate and the boundary joints of the combined splice along the rolling direction of the ultra-long titanium alloy plate in the embodiment, and performing the mechanical property test, wherein the results are shown in table 2.
Table 2 mechanical properties of ultra-long titanium alloy sheet prepared in comparative example 1
As can be seen from table 2, the tensile strength, the yield strength, the elongation after fracture and the reduction of area at the boundary joint of the ultra-long titanium alloy plate prepared by the comparative example are all lower than the middle position, which indicates that the convex ">" shaped head is selected to be firstly bitten in, although the defect-free connection of the titanium alloy plate is realized, the connection strength is lower than the middle position of the plate, the uniformity of the mechanical properties of the titanium alloy plate cannot be realized, and the preparation of the ultra-long titanium alloy plate blank is difficult to realize.
Comparative example 2
This comparative example comprises the following steps:
step one, respectively carrying out fixed length processing on 3 titanium alloy slabs which are forged from a titanium alloy ingot and have the size specifications of (length multiplied by width multiplied by thickness) 212.1mm multiplied by 222.4mm multiplied by 200mm, (length multiplied by width multiplied by thickness) 223.1mm multiplied by 239.2mm multiplied by 200mm and (length multiplied by width multiplied by thickness) 235.1mm multiplied by 215.9mm multiplied by 200mm by using a sawing machine to obtain 3 titanium alloy first slabs which have the size specifications of (length multiplied by width multiplied by thickness) 200mm multiplied by 200 mm;
step two, respectively machining the head and the tail of the 3 titanium alloy first plate blanks obtained in the step one by using a sawing machine to obtain 3 titanium alloy second plate blanks, wherein the head of the first titanium alloy second plate blank is straight, the tail of the first titanium alloy second plate blank is concave and is in an inverted T shape, the head of the second titanium alloy second plate blank is convex and is in an inverted T shape, the tail of the second titanium alloy second plate blank is concave and is in an inverted T shape, the head of the third titanium alloy second plate blank is convex and is in an inverted T shape, the tail of the third titanium alloy second plate blank is straight, the included angles of the concave and convex T shapes in the 3 titanium alloy second plate blanks are both 30 degrees, and the surface roughness Ra of the machined surface through a thousand-blade wheel is more than 6.3;
step three, sequentially combining and splicing the 3 sheets of titanium alloy second plate blanks obtained in the step two in a head-to-tail connection mode, enabling the tail part of the first sheet of titanium alloy second plate blank to be concave in shape and the head part of the second sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, enabling the concave in shape and the tail part of the second sheet of titanium alloy second plate blank to be concave in shape and the head part of the third sheet of titanium alloy second plate blank to be convex in shape and connected in a matched mode, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundary to enable the 3 sheets of titanium alloy second plate blanks to be fixedly connected to obtain a titanium alloy plate blank semi-finished product;
step four, putting the semi-finished product of the titanium alloy plate blank obtained in the step three into a heating furnace, preserving heat for 200min at 1150 ℃, discharging the semi-finished product of the titanium alloy plate blank out of the furnace, and carrying out primary hot rolling treatment, wherein the concave-shaped tail of the semi-finished product of the titanium alloy plate blank is firstly bitten in the primary hot rolling treatment process, the deformation of the primary hot rolling is 50 percent, so that a primary rolled plate blank with the dimension specification of (length, width and thickness) 2400mm multiplied by 200mm multiplied by 50mm is obtained, then putting the primary rolled plate blank into the heating furnace, preserving heat for 150min at 950 ℃, discharging the plate blank out of the furnace, carrying out secondary hot rolling treatment, the concave-shaped tail of the primary rolled plate blank is firstly bitten in the secondary hot rolling treatment process, the deformation of the secondary hot rolling is 75 percent, so that an ultra-long titanium alloy plate with the dimension specification of (length, width and thickness) 8000mm multiplied by 200mm multiplied by 15mm is obtained
GB/T228.1-2010 part 1 of the metal material tensile test is adopted: the method for testing the tensile property in the room temperature test method includes sampling the middle of the plate and the boundary joints of the combined splice along the rolling direction of the ultra-long titanium alloy plate in the embodiment, and performing the mechanical property test, wherein the results are shown in table 3.
TABLE 3 mechanical Properties of ultra-long titanium alloy sheet prepared in comparative example 2
As can be seen from table 3, the tensile strength, the yield strength, the elongation after fracture and the reduction of area at the boundary joint in the ultralong titanium alloy plate prepared by the comparative example are all lower than the middle position, which indicates that the machining surface roughness of the second titanium alloy plate blank affects the performance of the joint, and although the defect-free connection of the titanium alloy plate is realized, the connection strength is lower than the middle position of the plate, the uniformity of the mechanical properties of the titanium alloy plate cannot be realized, and the preparation of the ultralong titanium alloy plate blank is difficult to realize.
Example 2
The embodiment comprises the following steps:
step one, respectively carrying out fixed length processing on 3 titanium alloy slabs which are forged from a titanium alloy ingot and have the dimensions of (length, width and thickness) 243.3mm multiplied by 212.2mm multiplied by 200mm, (length, width and thickness) 251.1mm multiplied by 209.2mm multiplied by 200mm and (length, width and thickness) 231.1mm multiplied by 210.9mm multiplied by 200mm by using a sawing machine to obtain 3 titanium alloy first slabs with the dimensions of (length, width and thickness) 200mm multiplied by 200 mm;
step two, respectively machining the head and the tail of the 3 titanium alloy first plate blanks obtained in the step one by using a sawing machine to obtain 3 titanium alloy second plate blanks, wherein the head of the first titanium alloy second plate blank is straight, the tail of the first titanium alloy second plate blank is concave, the head of the second titanium alloy second plate blank is convex, the tail of the second titanium alloy second plate blank is concave, the included angle between the concave shape and the convex shape in the 3 titanium alloy second plate blanks is 45 degrees corresponding to Y and X in the figure 1, and the surface roughness Ra of the machined surface of the blisk wheel is less than or equal to 6.3 after polishing;
step three, sequentially combining and splicing the 3 titanium alloy second plate blanks obtained in the step two in a head-to-tail connection mode, so that the tail parts of the first titanium alloy second plate blanks are concave and convex, and are mutually matched and connected, the concave parts of the tail parts of the second titanium alloy second plate blanks are mutually matched and connected with the convex parts of the head parts of the third titanium alloy second plate blanks, and then spot welding fixing and seal welding are sequentially carried out on the boundaries of the combination and splicing, so that the 3 titanium alloy second plate blanks are fixedly connected, and a titanium alloy plate blank semi-finished product is obtained;
step four, putting the semi-finished product of the titanium alloy plate blank obtained in the step three into a heating furnace, preserving heat for 200min at 1150 ℃, discharging the semi-finished product of the titanium alloy plate blank out of the furnace, and carrying out primary hot rolling treatment, wherein the concave-shaped tail of the semi-finished product of the titanium alloy plate blank is firstly bitten in the primary hot rolling treatment process, the deformation of the primary hot rolling is 65%, so that a primary rolled plate blank with the dimension specification of (length, width and thickness) 2400mm multiplied by 200mm multiplied by 50mm is obtained, then putting the primary rolled plate blank into the heating furnace, preserving heat for 150min at 950 ℃, discharging the plate blank out of the furnace, carrying out secondary hot rolling treatment, wherein the concave-shaped tail of the primary rolled plate blank is firstly bitten in the secondary hot rolling treatment process, the deformation of the secondary hot rolling is 80%, so that an ultralong titanium alloy plate with the dimension specification of (length, width and thickness) 8000mm multiplied by 200mm multiplied by 15mm is obtained
GB/T228.1-2010 metallic Material tensile test part 1 is adopted: the method for testing the tensile properties in the room temperature test method includes sampling samples at the boundary joints between the middle of the ultra-long titanium alloy plate and the combined splice along the rolling direction of the ultra-long titanium alloy plate in the embodiment, and performing mechanical property tests, wherein the results are shown in table 4.
Table 4 mechanical properties of ultra-long titanium alloy sheet prepared in example 2
As can be seen from table 4, the strength of the boundary joint in the ultra-long titanium alloy plate prepared in this example is substantially consistent with the intermediate strength, and the plasticity index including the elongation after fracture and the reduction of area are also substantially consistent, which indicates that the method of the present invention realizes effective connection of titanium alloy plate blanks, and the ultra-long titanium alloy plate has uniform mechanical properties, thereby realizing preparation of the ultra-long titanium alloy plate.
Comparative example 3
This comparative example comprises the following steps:
step one, respectively carrying out fixed length processing on 3 titanium alloy slabs which are forged from a titanium alloy ingot and have the dimensions of (length, width and thickness) 256.3mm, 243.2mm, 200mm, (length, width and thickness) 253.3mm, 230.1mm, 200mm and (length, width and thickness) 224.1mm, 213.9mm, 200mm to obtain 3 titanium alloy first slabs with the dimensions of (length, width and thickness) 200mm, 200mm and 200mm by using a sawing machine;
step two, respectively carrying out vertical sawing machine processing on the head end and the tail end of the 3 sheets of titanium alloy first plate blanks obtained in the step one by adopting a sawing machine to obtain 3 sheets of titanium alloy second plate blanks, wherein the head parts and the tail parts of the 3 sheets of titanium alloy second plate blanks are the same and straight, and the surface roughness Ra of the polished surfaces machined by a millennium wheel is less than or equal to 6.3;
step three, sequentially combining and splicing the 3 sheets of titanium alloy second plate blanks obtained in the step two in a head-to-tail connection mode, enabling the straight tail portion of the first sheet of titanium alloy second plate blank to be matched and connected with the straight head portion of the second sheet of titanium alloy second plate blank, enabling the straight tail portion of the second sheet of titanium alloy second plate blank to be matched and connected with the straight head portion of the third sheet of titanium alloy second plate blank, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundary to enable the 3 sheets of titanium alloy second plate blanks to be fixedly connected to obtain a titanium alloy plate blank semi-finished product;
step four, putting the semi-finished product of the titanium alloy plate blank obtained in the step three into a heating furnace, preserving heat for 200min at 1150 ℃, discharging the semi-finished product of the titanium alloy plate blank out of the furnace, and carrying out primary hot rolling treatment, wherein the straight tail of the semi-finished product of the titanium alloy plate blank is firstly bitten in the primary hot rolling treatment process, the deformation of the primary hot rolling is 65%, so that a primary rolling plate blank with the size (length, width and thickness) of 2400mm, 200mm and 50mm is obtained, then putting the primary rolling plate blank into the heating furnace, preserving heat for 150min at 950 ℃, discharging the plate blank out of the furnace, carrying out secondary hot rolling treatment, wherein the straight tail of the primary rolling plate blank is firstly bitten in the secondary hot rolling treatment process, the deformation of the secondary hot rolling is 80%, so that an ultra-long titanium alloy plate with the size (length, width and thickness) of 8000mm, 200mm and 15mm is obtained
GB/T228.1-2010 part 1 of the metal material tensile test is adopted: the method for testing the tensile property in the room temperature test method includes sampling the middle of the plate and the boundary joints of the combined splice along the rolling direction of the ultra-long titanium alloy plate in the embodiment, and performing the mechanical property test, wherein the results are shown in table 5.
TABLE 5 mechanical Properties of ultra-long titanium alloy sheet prepared in comparative example 3
Through detection and observation, the boundary joint of the ultralong titanium alloy plate prepared by the comparative example has obvious unconnected defects, which indicates that the joint is cracked due to the plastic deformation of titanium alloy metal in the hot rolling treatment process; as can be seen from table 5, the tensile strength of the boundary joint in the ultra-long titanium alloy sheet prepared by the comparative example is obviously lower than that of the intermediate position, and the sheet is brittle, broken and non-plastic, which indicates that the mechanical properties of the ultra-long titanium alloy sheet prepared by vertically connecting the joints of the titanium alloy sheet blank are not uniform, and the qualified preparation of the ultra-long titanium alloy sheet cannot be realized.
Comparing the embodiment 2 with the comparative example 3, it can be seen that the invention enables the titanium alloy second slab to be efficiently combined and spliced in a head-to-tail connection mode by making the head and the tail of the two ends of the titanium alloy second slab in an outer convex shape and an inner concave shape which are mutually matched and connected, thereby effectively increasing the length of the semi-finished product of the titanium alloy slab, realizing the preparation of the qualified ultralong titanium alloy slab and enabling the qualified ultralong titanium alloy slab to meet the application requirements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (8)
1. A preparation method of an ultra-long titanium alloy plate is characterized by comprising the following steps:
firstly, carrying out fixed-length processing on a plurality of titanium alloy plate blanks to obtain a plurality of titanium alloy first plate blanks; the widths of the multiple titanium alloy first plate blanks are equal, and the thicknesses of the multiple titanium alloy first plate blanks are equal;
step two, respectively machining the head and the tail of the first plate blanks of the multiple titanium alloys obtained in the step one to obtain second plate blanks of the multiple titanium alloys; the head and the tail of the plurality of titanium alloy second slabs are provided with an outer convex shape and an inner concave shape which are matched with each other;
thirdly, sequentially combining and splicing the plurality of titanium alloy second slabs obtained in the second step in a head-to-tail connection mode, enabling the convex heads of the titanium alloy second slabs and the concave tails of the adjacent titanium alloy second slabs to be mutually matched and connected, and then sequentially performing spot welding fixing and seal welding on the combined and spliced boundaries to obtain titanium alloy slab semi-finished products;
and step four, carrying out hot rolling treatment on the titanium alloy plate blank semi-finished product obtained in the step three to obtain the ultra-long titanium alloy plate.
2. The method for preparing an ultralong titanium alloy plate according to claim 1, wherein the number of the plurality of first titanium alloy slabs in the second step is 2 or more.
3. The method of claim 1, wherein in the second step, the head portions and the tail portions of the two ends of the plurality of second slabs of titanium alloy are correspondingly identical and are respectively convex and concave, and the head portions and the tail portions are mutually matched.
4. The method for preparing the overlong titanium alloy plate as recited in claim 3, wherein the included angle of the convex ">" shape and the included angle of the concave ">" shape are both 30 ° to 45 °, and the surface roughness Ra is less than or equal to 6.3.
5. The method for preparing the ultra-long titanium alloy sheet material as claimed in claim 1, wherein the welding manner of the seal welding in the third step is vacuum electron beam welding.
6. The method for preparing an ultra-long titanium alloy sheet material according to claim 1, wherein the number of passes of the hot rolling treatment in the fourth step is 2 or more.
7. The method for preparing an ultra-long titanium alloy sheet according to claim 1, wherein the hot rolling deformation amount of the hot rolling treatment in the fourth step is 50-80%.
8. The method for preparing an overlength titanium alloy sheet material according to claim 1, wherein the feeding direction of the titanium alloy slab blank semi-finished product in the hot rolling treatment in the fourth step is that the concave tail is firstly bitten.
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