CN111346920B - Ti6Al7Nb titanium alloy sheet and preparation method thereof - Google Patents
Ti6Al7Nb titanium alloy sheet and preparation method thereof Download PDFInfo
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- CN111346920B CN111346920B CN202010255421.4A CN202010255421A CN111346920B CN 111346920 B CN111346920 B CN 111346920B CN 202010255421 A CN202010255421 A CN 202010255421A CN 111346920 B CN111346920 B CN 111346920B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 176
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 50
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 abstract description 7
- 239000000243 solution Substances 0.000 description 9
- 238000005336 cracking Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
Abstract
The embodiment of the invention provides a preparation method of a Ti6Al7Nb titanium alloy sheet, through the solid solution treatment of a hot rolling intermediate link and the warm rolling of a finished product, the Ti6Al7Nb titanium alloy can realize continuous large-deformation processing deformation, the surface of the sheet is smooth, surface cracks can not appear, the transverse and longitudinal metallographic structures and mechanical properties of the rolled sheet are basically consistent, particularly, the yield strength of the longitudinal sheet is greatly improved and is basically consistent with the transverse direction, the anisotropy of the sheet is greatly improved, and the sheet is completely different from the characteristics of the sheet prepared by the traditional method.
Description
Technical Field
The invention belongs to the technical field of titanium alloy sheet preparation, and particularly relates to a Ti6Al7Nb titanium alloy sheet and a preparation method thereof.
Background
The Ti6Al7Nb titanium alloy has excellent biocompatibility and the characteristics of high strength and high toughness, and is very suitable for medical bone fracture plate devices, and the used plate is a Ti6Al7Nb titanium alloy thin plate (the thickness is generally 1-3 mm). However, compared with the traditional Ti6Al4V titanium alloy, the Ti6Al7Nb titanium alloy has larger resistance to hot working plastic deformation, narrow processing temperature range, easy cracking of thermoplasticity and difficulty in obtaining required shape and size, so how to realize large plastic deformation is always a technical process problem in the industrial application process of the Ti6Al7Nb titanium alloy sheet.
Disclosure of Invention
In order to solve the technical problems that the Ti6Al7Nb titanium alloy hot sheet has larger resistance to plastic deformation during processing, has narrow processing temperature range, is easy to crack during thermoplasticity and is difficult to obtain required shape and size, the invention provides a Ti6Al7Nb titanium alloy sheet and a preparation method thereof, and the technical problems to be solved by the invention are realized by the following technical scheme:
the embodiment of the invention provides a preparation method of a Ti6Al7Nb titanium alloy sheet, which comprises the following steps:
obtaining a titanium alloy plate blank;
carrying out hot rolling on the titanium alloy plate blank to obtain a hot-rolled titanium alloy plate blank; wherein the hot rolling temperature is 960-;
hot-rolling the hot-rolled titanium alloy plate blank in a reversing manner to obtain a reversed hot-rolled titanium alloy plate blank; wherein the reversing hot rolling temperature is 940-;
carrying out solution treatment on the reversing hot-rolled titanium alloy plate blank, and air-cooling to room temperature; wherein the temperature of the solution treatment is 970-980 ℃ and the time is 20 min;
carrying out non-reversing hot rolling on the reversing hot-rolled titanium alloy plate blank subjected to the solution treatment to obtain a semi-finished titanium alloy sheet; wherein the non-reversing hot rolling temperature is 920-930 ℃, the time is 20min, the thickness of the semi-finished titanium alloy sheet is 6mm, the width is 950mm, and the length is 3400 mm;
performing intermediate annealing on the semi-finished titanium alloy sheet, and performing air cooling to room temperature to obtain a finished product sheet; wherein the temperature of the intermediate annealing is 780-800 ℃, and the time is 40 min;
warm-rolling the finished sheet to obtain a warm-rolled finished sheet; the warm rolling temperature is 680-720 ℃, the warm rolling time is 20min, the thickness of the warm rolled finished product sheet is 1-3mm, and the width is 950 mm;
annealing the warm-rolled finished sheet, air-cooling to room temperature and leveling to obtain a Ti6Al7Nb titanium alloy sheet; wherein the annealing temperature is 780-800 ℃, the time is 40min, and the leveling flatness is less than or equal to 1 mm/m.
Optionally, the thickness of the titanium alloy slab is 130mm, the width is 700mm, and the length is 1200 mm.
Optionally, the titanium alloy plate blank has the following chemical components: 6.2 wt% of Al, 7 wt% of Nb, 0.14 wt% of O, 0.18 wt% of Fe and the balance of Ti.
Optionally, the hot rolling the titanium alloy slab to obtain a hot-rolled titanium alloy slab includes:
carrying out hot rolling on the titanium alloy plate blank, and carrying out hot rolling on the titanium alloy plate blank to form a titanium alloy plate blank to be cut, wherein the thickness of the titanium alloy plate blank is 30mm, the width of the titanium alloy plate blank is 700mm, and the length of the titanium alloy plate blank is 5000 mm;
and after the two ends of the titanium alloy plate blank to be cut are cut to be even, dividing the titanium alloy plate blank to be cut into five equal parts along the length direction of the titanium alloy plate blank to be cut to obtain the hot-rolled titanium alloy plate blank.
Optionally, after obtaining the Ti6Al7Nb titanium alloy thin plate, the method further includes:
and carrying out fixed length cutting, surface acid washing, sanding and polishing treatment on the Ti6Al7Nb titanium alloy thin plate.
Optionally, the phase transition temperature of the titanium alloy slab is 1010-1020 ℃.
A Ti6Al7Nb titanium alloy thin plate is prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the beneficial effects that: through the solution treatment of the intermediate link of hot rolling and the warm rolling of the finished product, the Ti6Al7Nb titanium alloy can realize the continuous processing deformation with large deformation, the surface of the plate is smooth, surface cracks can not appear, the transverse and longitudinal metallographic structures and the mechanical properties of the rolled sheet are basically consistent, especially the yield strength of the longitudinal plate is greatly improved and is basically consistent with the transverse direction, the anisotropy of the plate is greatly improved, the characteristic is completely different from that of the plate prepared by the traditional method, the Ti6Al7Nb titanium alloy sheet prepared by the invention can realize the arbitrary cutting and processing in the transverse and longitudinal directions, the wire cutting processing of the bone fracture plate of a medical instrument is more convenient and flexible, the material utilization rate is greatly improved, and the manufacturing cost is saved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples.
FIG. 1 is a flowchart of a method for manufacturing a Ti6Al7Nb titanium alloy sheet according to an embodiment of the present invention;
FIG. 2 is a longitudinal-section metallographic phase diagram 2(a) and a cross-section metallographic phase diagram 2(b) of a delta 2.0mm Ti6Al7Nb titanium alloy thin plate provided by an embodiment of the invention;
fig. 3 is a longitudinal-section metallographic diagram 3(a) and a cross-section metallographic diagram 3(b) of a delta 2.0mm ti6Al7Nb titanium alloy thin plate prepared in a conventional manner according to an example of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
In order to solve the technical problems that in the prior art, the resistance of the Ti6Al7Nb titanium alloy hot sheet to plastic deformation is larger, the processing temperature range is narrow, the thermoplasticity is easy to crack, and the required shape and size are difficult to obtain, the invention introduces the solid solution treatment and the warm deformation rolling processing technology, solves the problem of premature cracking in the thermoplastic deformation process, obtains the Ti6Al7Nb titanium alloy thin sheet with excellent internal metallographic structure and mechanical property, has smooth and consistent plate surface, and does not have the plastic deformation defects of wrinkling, tensile cracking and the like.
Please refer to fig. 1. The embodiment of the invention provides a preparation method of a Ti6Al7Nb titanium alloy sheet, which comprises the following steps:
and S110, obtaining a titanium alloy plate blank.
Specifically, in the embodiment of the present invention, the dimensions of the titanium alloy slab are as follows: delta 130X 700X-1200 titanium alloy slab chemical composition: 6.2 wt% of Al, 7 wt% of Nb, 0.14 wt% of O, 0.18 wt% of Fe and the balance of Ti. Alloy transformation point Tβ＝1010-1020℃。
The titanium alloy plate blank meeting the standard can be directly purchased and obtained.
S120, carrying out hot rolling on the titanium alloy plate blank to obtain a hot-rolled titanium alloy plate blank; wherein the hot rolling temperature is 960-.
Specifically, the hot rolling is rolling after heating, in the embodiment of the present invention, the heating equipment may be a heating furnace or an industrial auxiliary electric heater, or other heating equipment that can heat the titanium alloy slab provided in the embodiment of the present invention, and the heating temperature is 960-.
It should be noted that, during the rolling process, when the temperature of the titanium alloy slab is lower than 960 ℃, the titanium alloy slab needs to be placed in a heating device to be reheated to ensure that the temperature of the titanium alloy slab is within 960-.
S130, reversing and hot rolling the hot-rolled titanium alloy plate blank to obtain a reversing hot-rolled titanium alloy plate blank; wherein the reversing hot rolling temperature is 940-.
Specifically, the reversing hot rolling means that the hot rolling is performed again in the direction perpendicular to the hot rolling direction during the hot rolling, it should be noted that, during the reversing hot rolling, when the temperature of the hot-rolled titanium alloy slab is lower than 940 ℃, the hot-rolled titanium alloy slab needs to be reheated, and when the heating temperature is up to 950 ℃, the reversing hot rolling is continuously performed on the hot-rolled titanium alloy slab, so that the cracking of the surface of the hot-rolled titanium alloy slab due to the temperature lower than 960 ℃ during the reversing rolling of the hot-rolled titanium alloy slab is prevented; and reversing hot rolling until a titanium alloy plate blank with the thickness of 12mm, the width of 950mm and the length of 1700mm is obtained, namely the reversing hot rolling titanium alloy plate blank in the embodiment.
S140, carrying out solution treatment on the reversing hot-rolled titanium alloy plate blank, and air-cooling to room temperature; wherein the temperature of the solution treatment is 970-980 ℃ and the time is 20 min.
Specifically, on the basis of the traditional process, a solid solution treatment link is added, namely, the rolled blank is subjected to high-temperature treatment close to the phase transition temperature and air-cooled, the treatment link can eliminate the processing texture formed by the previous hot processing, and the material obtains good plasticity.
S150, carrying out non-reversing hot rolling on the reversing hot-rolled titanium alloy plate blank subjected to the solution treatment to obtain a semi-finished titanium alloy sheet; wherein the non-reversing hot rolling temperature is 920-930 ℃, the time is 20min, the thickness of the semi-finished titanium alloy sheet is 6mm, the width is 950mm, and the length is 3400 mm.
In the non-reversing hot rolling process, when the temperature of the reversing hot-rolled titanium alloy slab is lower than 920 ℃, the hot-reversing hot-rolled titanium alloy slab needs to be reheated, and when the heating temperature is 930 ℃, the reversing hot-rolled titanium alloy slab continues to be subjected to non-reversing hot rolling, so that the cracking of the surface of the titanium alloy slab due to the temperature lower than 920 ℃ in the non-reversing rolling process of the reversing hot-rolled titanium alloy slab is prevented; hot rolling is not reversed until a titanium alloy plate blank with the thickness of 6mm, the width of 950mm and the length of 3400mm is obtained, namely the semi-finished titanium alloy sheet in the embodiment.
S160, intermediate annealing is carried out on the semi-finished product titanium alloy sheet, and air cooling is carried out to room temperature, so that a finished product sheet is obtained; wherein the temperature of the intermediate annealing is 780-800 ℃, and the time is 40 min.
S170, warm-rolling the finished thin plate to obtain a warm-rolled finished thin plate; the warm rolling temperature is 680-720 ℃, the warm rolling time is 20min, the thickness of the warm rolled finished product sheet is 1-3mm, and the width is 950 mm.
Specifically, in the final forming rolling link, namely rolling (1-3) mm sheets by 6mm, warm rolling is adopted to replace traditional cold rolling, so that the surface tearing caused by rapid work hardening of the alloy due to cold rolling deformation is avoided.
S180, annealing the warm-rolled finished sheet, air-cooling to room temperature and leveling to obtain a Ti6Al7Nb titanium alloy sheet; wherein the annealing temperature is 780-800 ℃, the time is 40min, and the leveling flatness is less than or equal to 1 mm/m.
Specifically, the invention introduces the solid solution treatment and warm rolling deformation processing technology, after two times of high temperature hot rolling, on the basis of the traditional process, a solid solution treatment link is added, namely, the rolled blank is subjected to high temperature treatment close to the phase transition temperature and air cooling, the treatment link can eliminate the processing texture formed by the previous hot processing, and the material obtains good plasticity; in the final forming rolling link, namely rolling (1-3) mm sheets by 6mm, warm rolling is adopted to replace the traditional cold rolling, so that the surface tearing caused by the rapid work hardening of the alloy due to cold rolling deformation is avoided.
According to the preparation method of the Ti6Al7Nb titanium alloy sheet provided by the embodiment of the invention, through the solid solution treatment of the hot rolling intermediate link and the warm rolling of the finished product, the Ti6Al7Nb titanium alloy can realize continuous large-deformation processing deformation, the surface of the sheet is smooth, no surface crack occurs, the transverse and longitudinal metallographic structures and the mechanical properties of the rolled sheet are basically consistent, especially the yield strength of the longitudinal sheet is greatly improved and is basically consistent with the transverse direction, the anisotropy of the sheet is greatly improved, which is completely different from the characteristics of the sheet prepared by the traditional method, the Ti6Al7Nb titanium alloy sheet prepared by the invention can realize arbitrary cutting and processing in the transverse and longitudinal directions, the wire cutting processing of a medical instrument bone fracture plate is more convenient and more flexible, the material utilization rate is greatly improved, and the manufacturing cost is saved.
Further, the thickness of the titanium alloy plate blank is 130mm, the width is 700mm, and the length is 1200 mm.
Specifically, in the embodiment of the present invention, the titanium alloy slab having the above size may be purchased directly, or the titanium alloy slab having a size larger than the above size may be purchased and the titanium alloy slab may be cut into the above size.
Further, the titanium alloy plate blank has the following chemical components: 6.2 wt% of Al, 7 wt% of Nb, 0.14 wt% of O, 0.18 wt% of Fe and the balance of Ti.
Further, hot rolling the titanium alloy slab to obtain a hot rolled titanium alloy slab includes:
carrying out hot rolling on the titanium alloy plate blank, and carrying out hot rolling on the titanium alloy plate blank to form a titanium alloy plate blank to be cut, wherein the thickness of the titanium alloy plate blank is 30mm, the width of the titanium alloy plate blank is 700mm, and the length of the titanium alloy plate blank is 5000 mm;
and after the two ends of the titanium alloy plate blank to be cut are cut to be even, dividing the titanium alloy plate blank to be cut into five equal parts along the length direction of the titanium alloy plate blank to be cut to obtain the hot-rolled titanium alloy plate blank.
Specifically, the length of the titanium alloy plate blank to be cut is 5000mm, the titanium alloy plate blank to be cut needs to be cut along the length direction, after uneven parts at two ends of the titanium alloy plate blank are removed, the titanium alloy plate blank is divided into five equal parts, and a hot-rolled titanium alloy plate blank is obtained, wherein the thickness of the hot-rolled titanium alloy plate blank is 30mm, the width of the hot-rolled titanium alloy plate blank is 700mm, and the length of the hot-rolled titanium alloy plate blank is 950 mm; the length of the titanium alloy plate blank to be cut is reduced, and the subsequent reversing hot rolling process is facilitated.
Further, after obtaining the Ti6Al7Nb titanium alloy thin plate, the method further comprises the following steps:
and carrying out fixed length cutting, surface acid washing, sanding and polishing treatment on the Ti6Al7Nb titanium alloy thin plate. Specifically, in the embodiment of the present invention, the fixed-length cutting, the surface acid washing, the sanding, and the polishing are all conventional technical means in the field, and each corresponding conventional apparatus is adopted, for example, the fixed-length cutting may be performed by using a fixed-length cutting machine, and the surface acid washing includes acid leaching, acid washing, and acid dipping: soaking the metal in acid liquor for a long time to remove thicker oxide. Such as scale and oxide skin generated in the rolling process of hot rolled steel plate acid leaching before cold rolling.
Acid washing: the method is used for descaling metal equipment and removing metal oxides without long-time acid soaking. Such as electroplating, coating, removing oxide scale and rust before phosphorization, and removing titanium surface oxide.
Acid dipping: during processing and short storage of the metal parts, a very thin oxide layer may form on the surface, and the oxide layer can be removed by wiping the metal surface with a less concentrated acid solution. Such as removal of discolored parts and scale generated on the metal surface by welding or hot working.
And sanding and polishing to obtain the Ti6Al7Nb titanium alloy sheet with surface smoothness Ra not more than 2 μm by using a sander and a polisher respectively.
Further, the phase transition temperature of the titanium alloy plate blank is 1010-1020 ℃.
A Ti6Al7Nb titanium alloy thin plate is prepared by the method.
According to the Ti6Al7Nb titanium alloy sheet prepared by the preparation method of the Ti6Al7Nb titanium alloy sheet provided by the embodiment of the invention, through the solid solution treatment of the hot rolling intermediate link and the warm rolling of the finished product, the Ti6Al7Nb titanium alloy can realize continuous large-deformation processing deformation, the surface of the sheet is smooth, surface cracks can not appear, the transverse and longitudinal metallographic structures and the mechanical properties of the rolled sheet are basically consistent, particularly, the yield strength of the longitudinal sheet is greatly improved and basically consistent with the transverse direction, the anisotropy of the sheet is greatly improved, and the sheet is completely different from the characteristics of the sheet prepared by the traditional method.
Example 2
In addition to the above example 1, the present invention will be described in detail with reference to the example of preparing a Ti6Al7Nb titanium alloy thin plate having a thickness of 2 mm.
Obtaining a titanium alloy slab, wherein the size of the Ti6Al7Nb titanium alloy slab is as follows: delta 130mm by 700mm by 1200 mm.
Hot rolling: the Ti6Al7Nb titanium alloy slab has the phase transition temperature below 50 ℃, namely 960-970 ℃, the hot rolling time is 150min, the titanium alloy slab with the size of sigma 130mm multiplied by 700mm multiplied by 1200mm is rolled to the titanium alloy slab with the size of sigma 30mm multiplied by 700mm multiplied by 5000mm, in the rolling process, the temperature of the titanium alloy slab needs to be ensured to be in the range of 960-970 ℃ to prevent the cracking of the plate surface of the titanium alloy slab caused by the temperature lower than 960 ℃, after the two ends of the titanium alloy slab after the hot rolling are cut to be even, the titanium alloy slab is divided into five equal parts along the length direction of the titanium alloy slab, and the titanium alloy slab with the size of sigma 30mm multiplied by 700mm multiplied by 950mm is obtained.
Reversing hot rolling: the Ti6Al7Nb titanium alloy plate blank has the phase transition temperature below 70, namely 940-950 ℃, the time is 30min, the size is sigma 30mm multiplied by 950mm multiplied by 700mm, the rolling is carried out to the size of 12mm multiplied by 950mm multiplied by 1700mm, the intermediate pass can be returned according to the actual rolling condition, the reversing rolling temperature is ensured to be 940-950 ℃, and the plate surface is prevented from cracking.
Solution treatment: (Tbeta-40, i.e.: 970-980) DEG C, 20min, and air-cooling.
Hot rolling without reversing: the transformation temperature is below 90, namely 920-930 ℃ (T beta-90, namely 920-930 ℃), 20min, sigma 12mm multiplied by 950mm multiplied by 1700mm → sigma 6mm multiplied by 950mm multiplied by 3400mm, and the intermediate pass can be returned to the furnace according to the actual rolling condition to prevent the plate surface from cracking.
Intermediate annealing: 780 and 800 ℃ for 40min, and cooling in air.
Warm rolling of the finished sheet: 680 ℃ and 720 ℃ for 20min, sigma 6mm X950 mm X3100 mm → sigma 2mm X950 mm X L
Annealing of the finished sheet: 780 ℃ and 800 ℃, 40min, air cooling, and online multi-roller leveling, wherein the flatness is less than or equal to 1 mm/m.
Cutting to length, pickling the surface, sanding and polishing to obtain the delta 2.0mmTi6Al7Nb titanium alloy sheet.
And (3) detecting the metallographic phase and the mechanical property of the delta 2.0mmTi6Al7Nb titanium alloy sheet.
Referring to fig. 2 and fig. 3, fig. 2 is a longitudinal section metallographic diagram 2(a) and a cross section metallographic diagram 2(b) of a δ 2.0mm ti6Al7Nb titanium alloy sheet prepared by the present invention, and it can be seen from fig. 2 that the transverse and longitudinal structures of the sheet rolled by the present invention are in a uniform grain morphology, and the primary equiaxial a is uniformly distributed in the matrix; fig. 3 is a longitudinal section metallographic phase diagram 3(a) and a cross section metallographic phase diagram 3(b) of a δ 2.0mm ti6Al7Nb titanium alloy sheet prepared in a conventional manner, and the metallographic morphology of the sheet processed in the conventional manner is shown in fig. 3, wherein it can be seen that the primary a distribution is significantly different in the transverse and longitudinal directions, the transverse a phase is substantially equiaxial, and the longitudinal a phase is elongated in the rolling direction. The difference of the transverse and longitudinal structures can bring about serious anisotropy, particularly the difference is that the longitudinal yield strength is remarkably low, and the use of the material is influenced, and the delta 2.0mm Ti6Al7Nb titanium alloy thin plate prepared for the same titanium alloy plate blank is required to be explained by the two modes.
The mechanical properties of the δ 2.0mmTi6Al7Nb titanium alloy sheet were evaluated and tested, and are shown in the following table. The following table shows the comparison of the mechanical properties of delta 2.0mm Ti6Al7Nb titanium alloy sheets prepared by the method of the present invention and the conventional method.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A preparation method of a Ti6Al7Nb titanium alloy thin plate is characterized by comprising the following steps:
obtaining a titanium alloy plate blank;
carrying out hot rolling on the titanium alloy plate blank to obtain a hot-rolled titanium alloy plate blank; wherein the hot rolling temperature is 960-;
hot-rolling the hot-rolled titanium alloy plate blank in a reversing manner to obtain a reversed hot-rolled titanium alloy plate blank; wherein the reversing hot rolling temperature is 940-;
carrying out solution treatment on the reversing hot-rolled titanium alloy plate blank, and air-cooling to room temperature; wherein the temperature of the solution treatment is 970-980 ℃ and the time is 20 min;
carrying out non-reversing hot rolling on the reversing hot-rolled titanium alloy plate blank subjected to the solution treatment to obtain a semi-finished titanium alloy sheet; wherein the non-reversing hot rolling temperature is 920-930 ℃, the time is 20min, the thickness of the semi-finished titanium alloy sheet is 6mm, the width is 950mm, and the length is 3400 mm;
performing intermediate annealing on the semi-finished titanium alloy sheet, and performing air cooling to room temperature to obtain a finished product sheet; wherein the temperature of the intermediate annealing is 780-800 ℃, and the time is 40 min;
warm-rolling the finished sheet to obtain a warm-rolled finished sheet; the warm rolling temperature is 680-720 ℃, the warm rolling time is 20min, the thickness of the warm rolled finished product sheet is 1-3mm, and the width is 950 mm;
annealing the warm-rolled finished sheet, air-cooling to room temperature and leveling to obtain a Ti6Al7Nb titanium alloy sheet; wherein the annealing temperature is 780-800 ℃, the time is 40min, and the leveling flatness is less than or equal to 1 mm/m.
2. The method for preparing the Ti6Al7Nb titanium alloy thin plate according to claim 1, wherein the titanium alloy plate blank has a thickness of 130mm, a width of 700mm and a length of 1200 mm.
3. The method for preparing the Ti6Al7Nb titanium alloy sheet according to claim 1, wherein the titanium alloy slab has a chemical composition: 6.2 wt% of Al, 7 wt% of Nb, 0.14 wt% of O, 0.18 wt% of Fe and the balance of Ti.
4. The method of making a Ti6Al7Nb titanium alloy sheet according to claim 2, wherein hot rolling the titanium alloy slab to obtain a hot rolled titanium alloy slab comprises:
carrying out hot rolling on the titanium alloy plate blank, and carrying out hot rolling on the titanium alloy plate blank to form a titanium alloy plate blank to be cut, wherein the thickness of the titanium alloy plate blank is 30mm, the width of the titanium alloy plate blank is 700mm, and the length of the titanium alloy plate blank is 5000 mm;
and after the two ends of the titanium alloy plate blank to be cut are cut to be even, dividing the titanium alloy plate blank to be cut into five equal parts along the length direction of the titanium alloy plate blank to be cut to obtain the hot-rolled titanium alloy plate blank.
5. The method for preparing the Ti6Al7Nb titanium alloy thin plate according to claim 1, further comprising, after obtaining the Ti6Al7Nb titanium alloy thin plate:
and carrying out fixed length cutting, surface acid washing, sanding and polishing treatment on the Ti6Al7Nb titanium alloy thin plate.
6. The method for preparing a Ti6Al7Nb titanium alloy sheet as claimed in claim 1, wherein the phase transformation temperature of the titanium alloy slab is 1010-1020 ℃.
7. A Ti6Al7Nb titanium alloy sheet, produced by the method of any one of claims 1 to 6.
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Application publication date: 20200630 Assignee: XI'AN SHENGTAI METAL MATERIALS CO.,LTD. Assignor: SHAANXI POLYTECHNIC INSTITUTE Contract record no.: X2023980033391 Denomination of invention: A Ti6Al7Nb titanium alloy sheet and its preparation method Granted publication date: 20211022 License type: Exclusive License Record date: 20230309 |