CN116786737A - Ti80 alloy plate and short-flow forging method for improving tissue uniformity - Google Patents
Ti80 alloy plate and short-flow forging method for improving tissue uniformity Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 87
- 239000000956 alloy Substances 0.000 title claims abstract description 87
- 238000005242 forging Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000011265 semifinished product Substances 0.000 claims description 64
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000227 grinding Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 8
- 239000010955 niobium Substances 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 11
- 230000007704 transition Effects 0.000 abstract description 4
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 16
- 238000002360 preparation method Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 229910001069 Ti alloy Inorganic materials 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Abstract
The application relates to a Ti80 alloy plate and a short-flow forging method for improving the uniformity of a structure, which are used for cogging and diagonal forging above a beta transformation point to ensure that blank grains are completely broken; radial forging of the wide anvil under the beta phase transition point, widening of the blank, and meanwhile, promoting deformation of a difficult deformation area, and improving the tissue uniformity of the obtained plate; and (5) forging a long anvil under the beta phase transition point, and finishing to improve the plate shape. The forging method disclosed by the application can fully deform and improve the difficult deformation area of the Ti80 alloy plate blank, obtain uniform and fine and compact structure, ensure that the structure uniformity of the finished Ti80 alloy plate is improved under the short processing flow, and also improve the surface quality, the forming dimensional accuracy and the like of the Ti80 alloy plate.
Description
Technical Field
The application relates to the technical field of Ti80 alloy plate forging, in particular to a Ti80 alloy plate and a short-flow forging method for improving tissue uniformity.
Background
Titanium and titanium alloys are widely used in the aerospace, marine and bioerodible medical fields due to their high tensile strength, low modulus, low density, low weight and good corrosion resistance, and the demand for titanium alloys is increasing especially in the welded parts on the stressed parts of submarines and ships. In order to satisfy the titanium alloy having both high strength and high corrosion resistance, various alloys have been developed.
Ti80 (Ti-6 Al-3Nb-2Zr-1 Mo) alloy is a near alpha titanium alloy which is self-developed in China and has good corrosion resistance, plasticity and toughness and welding performance. Ti80 alloy is used as 875MPa grade high-strength high-corrosion-resistance titanium alloy, is gradually represented by marine titanium alloy, and has stronger tensile resistance and corrosion resistance compared with TC4 (Ti-6 Al-4V) alloy widely applied in marine environment, so the Ti80 alloy has wider application prospect in manufacturing industries requiring high tensile and corrosion resistance, such as ships, submarine stress parts and the like. In the industrial production of Ti80 alloy plates, the smelting and forging processes determine the uniformity of plate structures, the uniformity of the structures determines the formation of microcracks in the use process of the plates, and the occurrence of the microcracks can lead the alloy to generate crevice corrosion in the marine environment, so that the stressed plates are invalid and accidents are caused. It is therefore highly desirable to improve the uniformity of the forged plate structure.
With the increasing application of Ti80 alloy structures in marine environments, the requirements on microstructure uniformity of the Ti80 alloy are higher, and in order to obtain the alloy with uniform structure, the requirements on the hot working preparation process (smelting, forging and the like) of the Ti80 alloy are higher.
The existing Ti80 alloy terminal structural member for the ocean uses bars, wires and plates as cold working materials, the hot working process of intermediate bars and wires before cold working is mature, and the prepared structure is uniform and has no obvious defects, so that the performance of the existing Ti80 alloy for the ocean can be met. However, in the preparation technology of Ti80 alloy plates by hot working, which is not mature in China, the Chinese patent application with the patent number of CN201811582924.1 discloses a Ti80 medium plate with high impact toughness, and a preparation method and application thereof, through optimizing ingot casting components, plate blank forging, plate rolling and other processes, the Ti80 medium plate with high impact toughness is prepared, the tensile strength of the Ti80 medium plate is more than or equal to 920Mpa, the impact energy KV2 is more than or equal to 52J, the microstructure of 'primary alpha phase + lamellar transformation beta phase' is provided, wherein the proportion of primary alpha phase is less than or equal to 20%, the proportion of lamellar transformation beta phase matrix is more than 80%, but the preparation method is complicated, the processing cost is high, and the preparation technology of Ti80 alloy bar wire cannot be directly applied to the plates due to the fact that the difference between the hot working preparation technology of the plates and the bar wire is large, so a convenient and rapid hot working method is needed, and the research on the preparation technology for improving the uniformity of the hot working structure of the Ti80 alloy plates becomes the problem to be solved.
Disclosure of Invention
Based on this, it is necessary to aim at the prior art that the hot working preparation technology of the Ti80 alloy rod wire cannot be directly applied to the plate, the Ti80 alloy plate is not mature in China, the disclosed preparation method is complex, the processing cost is high, a convenient and fast hot working method is needed, and the research on the preparation technology for improving the uniformity of the hot working structure of the Ti80 alloy plate becomes a urgent problem to be solved. Providing a Ti80 alloy plate and a short-flow forging method for improving the uniformity of a structure, wherein the blank crystal grains are ensured to be completely broken through cogging diagonal forging above a beta transformation point; radial forging is performed on a wide anvil at 20-30 ℃ under the beta transformation point, the blank is widened, deformation of a difficult deformation area is promoted, and the tissue uniformity of the obtained plate is improved; the long anvil forging at the temperature of 30-50 ℃ under the beta transformation point improves the plate shape by finishing, ensures that the structure uniformity of the finished Ti80 alloy plate is improved under the short processing flow, and the processed Ti80 alloy plate has good structure uniformity, shortens the processing flow and can greatly reduce the production cost.
A short-flow forging method for improving the structural uniformity of a Ti80 alloy plate comprises the following steps:
s10, cleaning the surface of a Ti80 cast ingot, and coating high-temperature glass powder;
s20, heating the Ti80 cast ingot, slowly heating to 1100-1200 ℃, preserving heat for 200-300 minutes, cogging, tapping the surface of the Ti80 cast ingot, forging with one fire, and sequentially carrying out radial drawing, upsetting, drawing, diagonal chamfering, furnace return temperature compensation, upsetting, diagonal drawing and diagonal chamfering, and air cooling to obtain a semi-finished product with one fire;
s30, grinding the primary semi-finished product, heating the ground primary semi-finished product, slowly heating to 900-980 ℃, preserving heat for 150-200 minutes, forging by using a wide anvil, upsetting and radially widening, and air cooling to obtain a secondary semi-finished product;
s40, grinding the secondary semi-finished product, heating the ground secondary semi-finished product, slowly heating to 850-950 ℃, preserving heat for 150-200 minutes, forging by using a long anvil, and air cooling to obtain a three-fire semi-finished product;
s50, planing and milling the surface of the three-fire semi-finished product with visible light, wherein the surface Ra is less than 3.2 mu m, and machining and chamfering to obtain the Ti80 alloy plate.
Preferably, in the short-process forging method for improving the uniformity of the structure of the Ti80 alloy sheet, the step S10 further includes the following steps:
s60, mixing and pressing an electrode block by adopting sponge titanium with the granularity of 0.8-12.7 mm and pure niobium ingots according to the proportion of (6.0-6.5% of Al, 2.5-3.2% of Nb, 1.5-2.3% of Zr, 0.7-1.3% of Mo, 0.08% of Fe, 0.1% of O, 0.05% of N, 0.05% of C, 0.0005% of H, 0.08% of Si and the balance Ti), carrying out combination welding on the electrode block to prepare a primary electrode, and carrying out three times of vacuum consumable arc melting to obtain the Ti80 ingots with relatively uniform components.
Preferably, in the short-process forging method for improving the uniformity of the structure of the Ti80 alloy sheet, the pressing rate of each wide anvil in the step S30 is 30% to 40%.
Preferably, in the short-process forging method for improving the structural uniformity of the Ti80 alloy sheet material, in the step S40, the anvil is preheated in advance.
Preferably, in the short-process forging method for improving the uniformity of the structure of the Ti80 alloy sheet, the pressing rate of each long anvil in the step S40 is 10% to 15%.
Preferably, in the short-process forging method for improving the uniformity of the structure of the Ti80 alloy sheet, the polishing the primary semi-finished product specifically includes:
polishing the primary semi-finished product by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack;
the grinding of the secondary semi-finished product specifically comprises the following steps:
and polishing the secondary semi-finished product by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack.
A Ti80 alloy plate is prepared by adopting the short-flow forging method for improving the structural uniformity of the Ti80 alloy plate.
The Ti80 alloy plate is applied to the stressed components of ships and submarines.
The technical scheme adopted by the application can achieve the following beneficial effects:
the Ti80 alloy plate and the short-flow forging method for improving the structural uniformity comprise the steps of vacuum consumable smelting to obtain Ti80 cast ingots with uniform components, cogging and diagonal forging above a beta transformation point, and ensuring that blank grains are completely broken; radial forging is performed on a wide anvil at 20-30 ℃ under the beta transformation point, the blank is widened, deformation of a difficult deformation area is promoted, and the tissue uniformity of the obtained plate is improved; and (3) forging a long anvil at the temperature of 30-50 ℃ under the beta transformation point, and finishing to improve the plate shape. Compared with the prior art, the forging piece is not required to be subjected to cold rolling or hot rolling, the Ti80 alloy plate with uniform structure can be obtained by performing upsetting forming with less fire in the forging process, the processing technology is convenient and quick, the process is short, the difficult deformation area of the blank of the Ti80 alloy plate can be fully deformed and improved by the forging method disclosed by the application, the uniform, fine and compact structure can be obtained, the structure uniformity of the finished Ti80 alloy plate can be improved under the short processing process, the processed Ti80 alloy plate has good structure uniformity, and the production cost can be greatly reduced by shortening the processing process.
Drawings
Fig. 1 and fig. 2 are schematic diagrams of microstructure of a Ti80 alloy sheet material disclosed in an embodiment of the present application.
Detailed Description
In order that the application may be readily understood, a more particular description of the application will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present application are shown in the examples. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 2, an embodiment of the application discloses a short-process forging method for improving the structural uniformity of a Ti80 alloy plate, which comprises the following steps:
s10, cleaning the surface of a Ti80 cast ingot, and coating high-temperature glass powder;
s20, heating a Ti80 cast ingot, slowly heating to 1100-1200 ℃, preserving heat for 200-300 minutes, cogging, tapping the surface of the Ti80 cast ingot, forging with one fire, and carrying out radial drawing, upsetting, drawing, diagonal chamfering, furnace return temperature compensation, upsetting, diagonal drawing and diagonal chamfering in sequence, and air cooling to obtain a semi-finished product with one fire;
specifically, ti80 cast ingots with the diameter of 700 mm are cleaned, coated with high-temperature glass powder, then put into a furnace for heating, slowly heated to 1100 ℃ to 1200 ℃, cogged and tapped on the surfaces of the Ti80 cast ingots after heat preservation for 200 to 300 minutes, then subjected to one-fire forging, and sequentially subjected to radial drawing, upsetting, drawing, diagonal chamfering, furnace returning and temperature supplementing, upsetting, diagonal drawing to 400 xL (width and height are 400 mm and length is L), diagonal chamfering and air cooling to obtain a one-fire semi-finished product. The step is cogging diagonal forging above the beta transformation point of the Ti80 ingot, and the complete breaking of blank grains is ensured.
S30, grinding the primary semi-finished product, heating the ground primary semi-finished product, slowly heating to 900-980 ℃, preserving heat for 150-200 minutes, forging by using a wide anvil, upsetting, radially widening, and air cooling to obtain a secondary semi-finished product;
specifically, the primary semi-finished product is polished by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack, then the primary semi-finished product is put into a furnace for heating, slowly heating to 900-980 ℃, preserving heat for 150-200 minutes, then forging by adopting a wide anvil, upsetting and radially stretching to form delta 250 multiplied by 1000 multiplied by L (the height of 250 mm, the width of 1000 mm and the length of L) in sequence, and air cooling is carried out to obtain the secondary semi-finished product. The step is that the wide anvil is radially forged at 20-30 ℃ under the beta phase transition point of the primary semi-finished product, the wide anvil forging has the advantages of high drawing efficiency, blank widening and accelerating deformation of the difficult deformation area, so that the blank difficult deformation area is fully deformed and improved, and the tissue uniformity of the obtained plate is improved.
Preferably, the pressing rate of each wide anvil is 30-40%, so that the wide anvil radial forging at 20-30 ℃ under the beta phase transition point of the primary semi-finished product can be further ensured, the blank is widened, the deformation of a difficult deformation area is promoted, and the tissue uniformity of the obtained plate can be further improved.
S40, grinding the secondary semi-finished product, heating the ground secondary semi-finished product, slowly heating to 850-950 ℃, preserving heat for 150-200 minutes, forging by using a long anvil, and air cooling to obtain a tertiary semi-finished product;
specifically, the secondary semi-finished product is polished by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack, then the secondary semi-finished product is put into a furnace for heating, slowly heating to 850-950 ℃, preserving heat for 150-200 minutes, then adopting long anvil forging, and obtaining the tertiary semi-finished product after long anvil forging, finishing and improving the plate shape to delta 220 multiplied by 1000 multiplied by L (the height of 220 mm, the width of 1000 mm and the length of L), and air cooling. The long anvil forging is performed at the beta transformation point of the secondary semi-finished product at 30-50 ℃, and the long anvil forging has the advantages of good shaping quality of the plate, finishing improvement of the plate shape, further improvement of the uniformity of the structure of the obtained plate, improvement of the surface quality, the shaping dimensional accuracy and the like of the obtained plate.
Preferably, the anvil is preheated in advance, so that thermal stress cracks and cracking caused by overlarge temperature difference of the anvil with low temperature on the surface of the contact forging secondary semi-finished product are avoided, and the surface quality, the forming dimensional accuracy and the like of the obtained plate are improved.
Preferably, the pressing rate of each long anvil is 10-15%, so that small deformation is adopted in each forging, cracking of the secondary semi-finished product caused by overlarge deformation is prevented, and the structural uniformity of the obtained plate can be further improved.
The wide anvil and long anvil forging processes described above are conventional in the art. The length of the hammer head adopted by the long anvil process is about 1 meter, and the length of the hammer head adopted by the wide anvil process is about 0.4 meter.
S50, planing and milling the surface of the three-fire semi-finished product with visible light, and mechanically chamfering to obtain the Ti80 alloy plate, wherein the surface Ra is less than 3.2 mu m.
Specifically, the surface of the three-fire semi-finished product is planed and milled with visible light, the surface Ra is less than 3.2 mu m, and the chamfer angle is machined to 45 degrees and 10mm, so that the specification delta 210 multiplied by 1000 is obtained +20/-0 ×L(δ210×1000 +20/-0 ×890 +10/-0 ) Is a Ti80 alloy plate.
The short-flow forging method for improving the structural uniformity of the Ti80 alloy plate comprises the steps of vacuum consumable smelting to obtain a Ti80 cast ingot with relatively uniform components, cogging and diagonal forging above a beta transformation point, and ensuring that blank grains are completely broken; radial forging is performed on a wide anvil at 20-30 ℃ under the beta transformation point, the blank is widened, deformation of a difficult deformation area is promoted, and the tissue uniformity of the obtained plate is improved; and (3) forging a long anvil at the temperature of 30-50 ℃ under the beta transformation point, and finishing to improve the plate shape. Compared with the prior art, the forging process can obtain the Ti80 alloy plate with uniform structure by performing cold rolling or hot rolling on the forging piece with less hot upsetting and forming, the processing technology is convenient and quick, the process is short, the difficult deformation area of the blank of the Ti80 alloy plate is fully deformed and improved by the forging method disclosed by the application, the uniform and fine and compact structure is obtained, the structure uniformity of the finished Ti80 alloy plate is improved under the short processing process, the structure uniformity of the processed Ti80 alloy plate is good, the surface quality, the forming dimensional precision and the like of the Ti80 alloy plate can be improved, the processing process is shortened, and the production cost is greatly reduced.
Preferably, the step S10 further comprises the following steps:
s60, mixing and pressing an electrode block by adopting sponge titanium with the granularity of 0.8-12.7 mm and pure niobium ingots according to the proportion of (6.0-6.5% of Al, 2.5-3.2% of Nb, 1.5-2.3% of Zr, 0.7-1.3% of Mo, 0.08% of Fe, 0.1% of O, 0.05% of N, 0.05% of C, 0.0005% of H, 0.08% of Si and the balance Ti), carrying out combination welding on the electrode block to prepare a primary electrode, and carrying out three times of vacuum consumable arc melting to obtain the Ti80 ingots with relatively uniform components. The Ti80 alloy plate has good structural uniformity by improving the components of the Ti80 alloy plate and matching with the forging process.
The embodiment of the application also discloses a Ti80 alloy plate, wherein the Ti80 alloy plate is prepared by adopting the short-flow forging method for improving the structural uniformity of the Ti80 alloy plate in any embodiment, and the Ti80 alloy plate has good structural uniformity and higher surface quality and molding dimensional accuracy.
One skilled in the art will appreciate the use of a Ti80 alloy sheet material as described above in stressed members of ships and submarines.
The technical scheme and technical effects of the present application will be further described by specific experimental examples, and it should be noted that the following comparative experimental examples are only for further explanation of the present application and are not limiting of the technical scheme of the present application.
Example 1:
the preparation method comprises the steps of adopting sponge titanium with granularity of 0.8mm to 12.7mm and pure niobium ingots to prepare a primary electrode by combined welding according to the proportion of (6.0% -6.5% of Al, 2.5% -3.2% of Nb, 1.5% -2.3% of Zr, 0.7% -1.3% of Mo, 0.08% of Fe, 0.1% of O, 0.05% of N, 0.05% of C, 0.0005% of H, 0.08% of Si and the balance Ti), and carrying out three times of vacuum consumable arc melting to obtain a Ti80 ingot with relatively uniform components, wherein the diameter of the Ti80 ingot is 700 mm;
cleaning the surface of the Ti80 cast ingot, and coating high-temperature glass powder;
heating the Ti80 cast ingot in a furnace to slowly raise the temperature of the Ti80 cast ingot to 1100 ℃, preserving the heat for 300 minutes, then tapping the surface of the Ti80 cast ingot, forging with one fire, radially drawing, upsetting, chamfering diagonally, returning to the furnace to supplement the temperature, upsetting, diagonally drawing to 400 xL (the width and the height are 400 mm and the length is L), chamfering diagonally, and air cooling to obtain a semi-finished product with one fire;
grinding the primary semi-finished product, heating the primary semi-finished product in a furnace, slowly heating the primary semi-finished product to 950 ℃, preserving heat for 200 minutes, forging by using a wide anvil, upsetting the primary semi-finished product with the pressing rate of 40% in each channel of the wide anvil and radially stretching to form the primary semi-finished product with the pressing rate of 400 xL to delta 250 xB 1000 xL (with the height of 250 mm, the width of 1000 mm and the length of L), and air cooling to obtain a secondary semi-finished product;
grinding the secondary semi-finished product, heating the secondary semi-finished product in a furnace, slowly heating the secondary semi-finished product to 900 ℃, preserving heat for 200 minutes, forging by adopting a long anvil, preheating the anvil in advance, wherein the pressing rate of each long anvil is 10%, and performing long anvil forging and finishing on the secondary semi-finished product with delta of 250 multiplied by 1000 multiplied by L to improve the plate shape to delta of 220 multiplied by 1000 multiplied by L (with the height of 220 mm, the width of 1000 mm and the length of L), and air cooling to obtain a tertiary semi-finished product;
the surface of the three-fire semi-finished product with delta 220 multiplied by 1000 multiplied by L is planed and milled with visible light, the surface Ra is less than 3.2 mu m, and the chamfer angle is machined to 45 degrees multiplied by 10mm, so that the specification delta 210 multiplied by 1000 is obtained +20/-0 ×L(δ210×1000 +20/-0 ×890 +10/-0 ) Is a Ti80 alloy plate.
The obtained Ti80 alloy plate was sampled, examined for structural uniformity, and the metallographic results were shown in FIG. 1 and FIG. 2, and samples were taken at three points of the head, middle and tail of the obtained Ti80 alloy plate at intervals in the longitudinal direction, numbered 1, 2 and 3, and the mechanical properties were measured, respectively, and the results were shown in Table 1.
TABLE 1 mechanical Property test results of Ti80 alloy plates
As can be seen from fig. 1 and 2: the obtained Ti80 alloy plate has uniform and fine structure and is compact without obvious defects, which indicates that the forging method disclosed by the application can fully improve the deformation of the difficult deformation area of the Ti80 alloy plate blank to obtain uniform, fine and compact structure, the average grain size is less than or equal to 30 microns, and the uniformity of the structure of the Ti80 alloy plate is greatly improved through diagonal cogging and radial stretching forging;
table 1 shows the mechanical properties of Ti80 alloy plates, the Ti80 alloy plates have good transverse and longitudinal room temperature properties, the tensile strength is 880.73MPa on average, the yield strength is 792.53MPa on average, the elongation is 16.9% on average, the shrinkage is 38.53% on average, and the impact absorption power is 78.75J on average; the three-point tensile strength deviation of the head, middle and tail of the Ti80 alloy plate is 1.3, the yield strength deviation is 0.9, the elongation deviation is 0.7, the shrinkage deviation is 1.1, the impact absorption power deviation is 6.81, so that the Ti80 alloy plate prepared by the scheme disclosed by the application is high in uniformity of mechanical properties, small in mechanical parameter deviation and good in uniformity of structure of the Ti80 alloy plate. As the structural uniformity of the Ti80 alloy plate is greatly improved, the mechanical property difference of sampling at the unnecessary position is smaller, and the plate in the length direction has high strength and high impact absorption power, thereby completely meeting the requirements of the ship manufacturing industry on the Ti80 alloy plate.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. A short-flow forging method for improving the structural uniformity of a Ti80 alloy plate is characterized by comprising the following steps:
s10, cleaning the surface of a Ti80 cast ingot, and coating high-temperature glass powder;
s20, heating the Ti80 cast ingot, slowly heating to 1100-1200 ℃, preserving heat for 200-300 minutes, cogging, tapping the surface of the Ti80 cast ingot, forging with one fire, and sequentially carrying out radial drawing, upsetting, drawing, diagonal chamfering, furnace return temperature compensation, upsetting, diagonal drawing and diagonal chamfering, and air cooling to obtain a semi-finished product with one fire;
s30, grinding the primary semi-finished product, heating the ground primary semi-finished product, slowly heating to 900-980 ℃, preserving heat for 150-200 minutes, forging by using a wide anvil, upsetting and radially widening, and air cooling to obtain a secondary semi-finished product;
s40, grinding the secondary semi-finished product, heating the ground secondary semi-finished product, slowly heating to 850-950 ℃, preserving heat for 150-200 minutes, forging by using a long anvil, and air cooling to obtain a three-fire semi-finished product;
s50, planing and milling the surface of the three-fire semi-finished product with visible light, wherein the surface Ra is less than 3.2 mu m, and machining and chamfering to obtain the Ti80 alloy plate.
2. The short-process forging method for improving the structural uniformity of a Ti80 alloy sheet material according to claim 1, wherein said step S10 is preceded by the step of:
s60, mixing and pressing an electrode block by adopting sponge titanium with the granularity of 0.8-12.7 mm and pure niobium ingots according to the proportion of (6.0-6.5% of Al, 2.5-3.2% of Nb, 1.5-2.3% of Zr, 0.7-1.3% of Mo, 0.08% of Fe, 0.1% of O, 0.05% of N, 0.05% of C, 0.0005% of H, 0.08% of Si and the balance Ti), carrying out combination welding on the electrode block to prepare a primary electrode, and carrying out three times of vacuum consumable arc melting to obtain the Ti80 ingots with relatively uniform components.
3. The short-process forging method for improving structural uniformity of a Ti80 alloy plate according to claim 1, wherein in said step S30, the pressing rate per pass of the wide anvil is 30% to 40%.
4. The short-process forging method for improving structural uniformity of a Ti80 alloy plate according to claim 1, wherein in said step S40, an anvil is preheated in advance.
5. The short-process forging method for improving structural uniformity of a Ti80 alloy plate according to claim 1, wherein in said step S40, the pressing rate of each long anvil is 10% to 15%.
6. The short-process forging method for improving the structural uniformity of a Ti80 alloy sheet material according to claim 1, wherein the grinding of the primary semi-finished product specifically comprises:
polishing the primary semi-finished product by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack;
the grinding of the secondary semi-finished product specifically comprises the following steps:
and polishing the secondary semi-finished product by adopting the modes of peeling, grinding and polishing to remove surface oxide skin and crack defects until the surface of the primary semi-finished product is free of oxide skin and crack.
7. A Ti80 alloy sheet material, characterized in that the Ti80 alloy sheet material prepared by the short-flow forging method for improving the structural uniformity of the Ti80 alloy sheet material according to any one of claims 1 to 6 is used.
8. Use of a Ti80 alloy sheet material according to claim 7 in ship and submarine stress sections.
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