CN109402543B - Titanium-aluminum alloy bar sheath extrusion preparation method - Google Patents
Titanium-aluminum alloy bar sheath extrusion preparation method Download PDFInfo
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- CN109402543B CN109402543B CN201811526144.5A CN201811526144A CN109402543B CN 109402543 B CN109402543 B CN 109402543B CN 201811526144 A CN201811526144 A CN 201811526144A CN 109402543 B CN109402543 B CN 109402543B
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- 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
A method for preparing a titanium-aluminum alloy bar by sheath extrusion comprises the steps of cutting off the head and the tail of a titanium-aluminum alloy ingot, polishing the surface of the ingot and the surfaces of the head and the tail of the ingot, wrapping the titanium-aluminum alloy ingot by high silica cloth, and putting the wrapped ingot into a sheath to obtain a sheath extrusion blank; heating the sheathed extrusion blank, putting the sheathed extrusion blank into a glass protective lubricant, uniformly adhering, extruding, cooling, removing the sheath and obtaining the titanium-aluminum alloy bar. Because the heating temperature is high, the extrusion lubricating material is difficult to bear the high temperature, the lubricating material glass protective lubricant is coated in a rolling way after the heating is finished, the lubricating effect in the extrusion process is ensured, in addition, the temperature of the sheath material is also reduced, so that the deformation resistance of the sheath material and the titanium-aluminum alloy is kept consistent, and the subsequent extrusion process is ensured to be carried out smoothly. The titanium-aluminum alloy cast ingot is wrapped in the sheath material, and is under the action of pressure stress in the extrusion deformation process, and the stress state can fully exert the plasticity of the material and inhibit the generation of cracks.
Description
Technical Field
The invention belongs to the technical field of alloy materials and preparation thereof, and particularly relates to a sheath extrusion preparation method of a titanium-aluminum alloy bar.
Background
The Ti-Al alloy is an intermetallic compound, and has both metal plasticity and ceramic high-temperature strength owing to the long-range ordered arrangement of atoms and the coexistence of metal bonds and covalent bonds between atoms. The elasticity modulus, creep resistance and the like of the titanium-aluminum alloy are equivalent to those of the nickel-based high-temperature alloy which is widely used in the current aerospace engine, the density of the titanium-aluminum alloy is only half of that of the nickel-based high-temperature alloy or even lower than that of the titanium-aluminum alloy, and the use temperature of the titanium-aluminum alloy is expected to reach 900 ℃. The titanium-aluminum alloy is an optimal candidate material at 650-1000 ℃, is expected to be applied to engineering in the manufacturing field of high-temperature components such as aeroengines, space engines, hypersonic aircraft shells, airfoils and the like, and has partially or completely replaced the high-density nickel-based, iron-based and cobalt-based high-temperature alloy materials which are used in large quantities at present. Because of the advantages of the titanium-aluminum alloy, the titanium-aluminum alloy is highly valued in aerospace engine materials.
However, titanium-aluminum alloy is an ordered intermetallic compound, and has the characteristic of the ordered intermetallic compound, namely, the intrinsic brittleness, which determines that the room-temperature plasticity and the fracture toughness of the titanium-aluminum alloy are very low, and the titanium-aluminum alloy can fracture when the room-temperature tensile elongation is less than 1%. Due to the intrinsic brittleness, the hot-working performance of the titanium-aluminum alloy is very poor and the titanium-aluminum alloy is easy to crack, so that the hot-working forming difficulty of the titanium-aluminum alloy is very high, which becomes a main technical bottleneck problem restricting the engineering application research and popularization and application of the titanium-aluminum alloy at present, and the cracking problem in the hot-working process of the titanium-aluminum alloy is firstly solved when the titanium-aluminum alloy is applied to engineering.
Disclosure of Invention
Aiming at the problem of cracking in the existing titanium-aluminum alloy hot working process, the invention aims to provide a titanium-aluminum alloy bar sheath extrusion preparation method which is convenient for economically carrying out hot working on a titanium-aluminum alloy cast ingot.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing a titanium-aluminum alloy bar by sheath extrusion comprises the following steps:
the method comprises the following steps: preparing a titanium-aluminum alloy ingot by adopting a vacuum consumable arc melting method;
step two: cutting off the head and the tail of the titanium-aluminum alloy ingot prepared in the step one by 100-150 mm, and then polishing the surface of the ingot and the surfaces of the head and the tail ends, wherein the surface roughness is less than or equal to 1.6 mu m; the macrostructure of the head end and the tail end of the ingot is radial dendritic crystal structure and has no crack;
step three: wrapping the titanium-aluminum alloy cast ingot 6 obtained in the step two by using high silica cloth, and then putting the wrapped ingot into a sheath to obtain a sheath extrusion blank;
step four: heating the sheathed extrusion blank in a heating furnace at 1300-1400 ℃ for 4-5 h;
step five: and after the heat preservation is finished, placing the sheathed extrusion blank into a glass protection lubricant to roll for 2-3 times, extruding after the glass protection lubricant is uniformly adhered to the surface of the blank, cooling after the extrusion, and removing the sheath to obtain the titanium-aluminum alloy bar.
The further improvement of the invention is that in the step one, the smelting frequency is three times, the temperature of crucible cooling water is controlled to be 40-45 ℃ during the third smelting, the cooling time of the cast ingot is 1-1.5 h, the cast ingot is wrapped by heat preservation cotton after being taken out of the furnace, and the cast ingot is slowly cooled to the room temperature.
In the second step, if the macrostructure of the head end face and the tail end face of the ingot does not meet the conditions of the radial dendritic crystal structure and no crack, the ingot is cut off until the conditions are met.
The further improvement of the invention is that in the third step, the thickness of the high silica cloth is 0.5-1 mm.
The further improvement of the invention is that in the third step, the length of the sheath extrusion blank is 300-400 mm.
The invention has the further improvement that in the third step, the sheath comprises a cylinder body, a top cover and a bottom cover, wherein the top cover is arranged at the top of the cylinder body, and the bottom cover is arranged at the bottom of the cylinder body.
The invention has the further improvement that the thickness of the cylinder body is 19-25 mm; the top cover is of a conical structure, the taper is 120 degrees, the thickness is 60-80 mm, and the top cover is provided with vent holes (2); the thickness of the bottom cover is 30-40 mm.
The invention is further improved in that annular ribs with the width of 2-3 mm and the thickness of 0.5-1.5 mmmm are arranged on the cylindrical surfaces of the top cover and the bottom cover along the circumferential direction.
The further improvement of the invention is that in the third step, the surface roughness of the surface of the sheath contacted with the titanium-aluminum cast ingot is less than or equal to 1.6 mu m, and the surface roughness of the rest surface is 6.3-12.6 mu m; the sheath material is titanium or titanium alloy.
The invention is further improved in that the extrusion ratio is 3-4, and the extrusion speed is 3-10 mm/s.
The invention further improves the method that the specific process of extrusion is as follows: the method comprises the following steps of aligning a blank top cover to an inner cavity of an extrusion die, pushing a blank out of the extrusion die by an extrusion rod from one end of a blank bottom cover, and slowly cooling the extruded titanium-aluminum alloy bar to room temperature by wrapping the titanium-aluminum alloy bar with heat insulation cotton.
Compared with the prior art, the invention has the beneficial effects that:
1) because the heating temperature is high, the extrusion lubricating material is difficult to bear the high temperature, the invention creatively applies the glass protective lubricant of the lubricating material to roll after the heating is finished, thereby ensuring the lubricating effect in the extrusion process, and in addition, the temperature of the sheath material is also reduced, so that the deformation resistance of the sheath material and the titanium-aluminum alloy is kept consistent, and the subsequent extrusion process is ensured to be carried out smoothly.
2) The titanium-aluminum alloy cast ingot is wrapped in the sheath material, and is under the action of pressure stress in the extrusion deformation process, and the stress state can fully exert the plasticity of the material and inhibit the generation of cracks.
3) The preparation method is simple, the process is easy to industrialize, and the prepared titanium-aluminum alloy bar can be sheathed and extruded again by adopting the method of the invention to obtain the bar with finer grains and smaller specification.
Furthermore, the ingot is produced by adopting a vacuum consumable electrode arc furnace, the metallographic structure of the middle part of the prepared ingot is a single radial dendritic crystal structure due to the water cooling effect of the crucible, and the part with inconsistent metallographic structures of the head and the tail of the ingot is removed and then is subjected to hot working, so that cracks can be prevented from occurring in the hot working process due to different crystal grain orientations.
Drawings
FIG. 1 shows the macrostructure of an ingot according to the present invention.
FIG. 2 is a schematic of a jacket.
FIG. 3 is a pictorial representation of a bar made in accordance with the present invention.
In the figure, 1 is a top cover, 2 is a vent hole, 3 is a cylinder body, 4 is a bottom cover, 5 is high silica cloth, 6 is a titanium aluminum alloy cast ingot, and 7 is a rib.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The method comprises the following steps: the titanium-aluminum alloy ingot is prepared by adopting a vacuum consumable arc melting method, the melting frequency is three times, the melting method adopts a conventional titanium alloy melting method, particularly, the temperature of crucible cooling water is controlled to be 40-45 ℃ during the third melting, the cooling time of the ingot is 1-1.5 h, the ingot is quickly wrapped by heat preservation cotton after being discharged from a furnace, and the ingot is slowly cooled to the room temperature.
Step two: and (3) cutting off the head and the tail of the titanium-aluminum alloy ingot prepared in the step one by 100-150 mm, and then polishing the surface of the ingot and the surfaces of the head and the tail ends, wherein the surface roughness is less than or equal to 1.6 mu m. And (3) observing the head end face and the tail end face of the ingot in a low power mode, wherein the low power structure is a radial dendritic crystal structure and has no cracks (see figure 1), and cutting the low power structure when the low power structure does not meet the requirements until the low power structure meets the requirements.
Step three: manufacturing a sheath, referring to fig. 2, the sheath comprises a barrel 3, a top cover 1 and a bottom cover 4, wherein the thickness of the barrel 3 is 19-25 mm, the top cover 1 is of a conical structure, the taper is 120 degrees, the thickness is 60-80 mm, a vent hole 2 is reserved on the top cover 1, the thickness of the bottom cover 4 is 30-40 mm, and ribs 7 with the width of 2-3 mm and the thickness of 0.5-1.5 mm are processed on cylindrical surfaces of the top cover 1 and the bottom cover 4. The rib 7 is circumferentially provided with a circle along the cylindrical surface, namely the rib 7 is annular and is beneficial to coating glass protective lubricant; the surface roughness of the surface of the sheath, which is in contact with the titanium-aluminum alloy cast ingot, is less than or equal to 1.6 mu m, the surface roughness of the rest surface is between 6.3 and 12.6 mu m, and the sheath material is titanium or titanium alloy.
Step four: and (3) wrapping the titanium-aluminum alloy cast ingot 6 prepared in the step two by using high silica cloth 5 with the thickness of 0.5-1 mm, then putting the wrapped ingot into the barrel 3 prepared in the step three, and welding the bottom cover 4 and the top cover 1 on the barrel 3 to obtain a sheath extrusion blank, wherein the length of the blank is controlled to be 300-400 mm. Wherein, the high silica cloth 5 mainly plays a role in heat insulation and is convenient for the separation of the sheath.
Step five: and (4) heating the sheath extrusion blank prepared in the step (4) in a heating furnace at 1300-1400 ℃, and preserving heat for 4-5 hours.
Step six: and after the heat preservation is finished, placing the sheath extrusion blank into a glass protective lubricant prepared in advance, rolling for 2-3 times, after the glass protective lubricant on the surface of the blank is uniformly adhered, placing the sheath extrusion blank into an extruder, and extruding at the extrusion speed of 3-10 mm/s at an extrusion ratio of 3-4. The extrusion process is that the blank top cover is aligned to the inner cavity of the extrusion die, the extrusion rod pushes the blank out of the extrusion die from one end of the blank bottom cover, and the extruded titanium-aluminum alloy bar is wrapped by heat insulation cotton and slowly cooled to room temperature.
Step seven: and (5) removing the sheath of the bar obtained in the step six to obtain a finished bar, wherein a real object of the bar is shown in figure 3.
The following are specific examples.
Example 1
Taking the preparation of Ti48Al2Cr2Nb alloy bar as an example, the preparation steps are as follows:
the method comprises the following steps: preparing Ti48Al2Cr2Nb alloy cast ingots by a vacuum consumable arc melting method, melting the first two times by a conventional method, controlling the cooling water temperature at 45 ℃ during the third melting, cooling for 1h, wrapping the alloy cast ingots by heat-insulating cotton and cooling to room temperature, wherein the specification of the prepared Ti48Al2Cr2Nb alloy cast ingots is phi 210 mm.
Step two: cutting off the head and the tail of the ingot prepared in the step one by 100mm, peeling to phi 200mm, detecting the macrostructure of the head and the tail end, and cutting the ingot with the length of 250mm as an extrusion blank when the macrostructure is a radial dendritic crystal structure, wherein the surface roughness of the ingot is less than or equal to 1.6 mu m, and the macrostructure is detected, and the figure 1 shows.
Step three: making a jacket, see fig. 2, jacket cylinder 3 specification: outer diameter
Inner diameter
Height 251 mm; 1 specification of the top cover: 70mm in thickness, 125mm in diameter of the upper end face of the vertebral body, 120 degrees in taper, 250mm in diameter of the lower end face and an opening at the center
An aperture; the diameter of the bottom cover 4 is 250mm, the thickness is 40mm, and ribs 7 with the width of 2mm and the thickness of 1mm are distributed on the cylindrical surfaces of the top cover and the bottom cover.
Step four: wrapping the titanium-aluminum alloy ingot 6 with the diameter of 200X 250mm prepared in the step two by using high silica cloth 5 with the thickness of 0.5mm, putting the wrapped titanium-aluminum alloy ingot into the barrel 3 prepared in the step three, and welding the top cover 1 and the bottom cover 4 on the barrel to obtain a sheath extrusion blank with the diameter of 250X 360 mm.
Step five: heating the sheathed extrusion blank obtained in the step four in a heating furnace at 1380 ℃ for 5 hours;
step six: after the heat preservation is finished, the sheath extrusion blank is placed into a glass protection lubricant to roll back and forth for 2 times, after the glass protection lubricant on the surface of the blank is uniformly adhered, the sheath extrusion blank is placed into an extrusion die to be extruded, the extrusion ratio is 4, and the extrusion speed is 5 mm/s. And (3) wrapping the extruded rod material with the diameter of 125 multiplied by 1450mm by using heat preservation cotton, and slowly cooling to room temperature.
Step seven: and 6, removing the sheath of the rod obtained in the sixth step to obtain a phi 95X 1000mm specification Ti48Al2Cr2Nb alloy rod, and referring to FIG. 3.
Example 2
Taking the preparation of a Ti47Al2Cr2Nb alloy bar as an example, the preparation steps are as follows:
the method comprises the following steps: the Ti47Al2Cr2Nb alloy ingot is prepared by a vacuum consumable arc melting method, the first two times of melting are carried out by a conventional method, the cooling water temperature is controlled at 45 ℃ during the third time of melting, the cooling time is 1h, the alloy ingot is wrapped by heat-insulating cotton and cooled to room temperature after being taken out of the furnace, and the specification of the prepared Ti47Al2Cr2Nb alloy ingot is phi 120 mm.
Step two: cutting off the head and the tail of the ingot prepared in the step one by 100mm, peeling to phi 110mm, wherein the surface roughness of the ingot is less than or equal to 1.6 mu m, checking the macrostructure of the head and the tail end, and cutting the ingot with the length of 250mm to be used as an extrusion blank when the macrostructure is a radial dendritic crystal structure.
Step three: manufacturing a sheath, and the specification of a cylinder body: outer diameter
Inner diameter
Height 251 mm; the specification of the top cover is as follows: 70mm in thickness, 85mm in diameter of the upper end face of the vertebral body, 120 degrees in taper, 150mm in diameter of the lower end face and an opening at the center
An aperture; the diameter of the bottom cover is 150mm, the thickness of the bottom cover is 40mm, and ribs with the width of 2mm and the thickness of 1mm are distributed on the cylindrical surfaces of the top cover and the bottom cover.
Step four: wrapping the titanium-aluminum alloy cast ingot with the diameter of 110X 250mm prepared in the step two by using high silica cloth with the thickness of 0.5mm, putting the titanium-aluminum alloy cast ingot into the cylinder prepared in the step three, and welding the top cover and the bottom cover on the cylinder to obtain the jacket extrusion blank with the diameter of 150X 360 mm.
Step five: putting the sheathed extrusion blank obtained in the step four into a heating furnace for heating, wherein the heating temperature is 1350 ℃, and the heat preservation time is 4 hours;
step six: after the heat preservation is finished, the sheathed extrusion blank is put into a glass protective lubricant to roll back and forth for 2 times, after the glass protective lubricant on the surface of the blank is uniformly adhered, the blank is put into an extrusion die to be extruded, the extrusion ratio is 3, the extrusion speed is 10mm/s, and the bar with the specification of phi 85X 1120mm is obtained by extrusion, is wrapped by heat preservation cotton and is slowly cooled to the room temperature.
Step seven: and 6, removing the sheath of the rod obtained in the sixth step to obtain the phi 57 multiplied by 760mm specification Ti47Al2Cr2Nb alloy rod.
Example 3
Taking the preparation of a Ti47.5Al2.5V1Cr alloy bar as an example, the preparation steps are as follows:
the method comprises the following steps: preparing a Ti47.5Al2.5V1Cr alloy ingot by adopting a vacuum consumable arc melting method, wherein the first two times of melting are performed by adopting a conventional method, the third time of melting is performed by controlling the cooling water temperature at 40 ℃, the cooling time is 1h, the Ti47.5Al2.5V1Cr alloy ingot is wrapped by heat-insulating cotton and cooled to room temperature, and the specification of the prepared Ti47.5Al2.5V1Cr alloy ingot is phi 160 mm.
Step two: cutting off 100mm of the head and the tail of the ingot prepared in the step one, peeling to phi 150mm, wherein the surface roughness of the ingot is less than or equal to 1.6 mu m, checking the macrostructure of the head and the tail end, and cutting 250mm of the ingot to be used as an extrusion blank when the macrostructure is a radial dendritic crystal structure.
Step three: manufacturing a sheath, and the specification of a cylinder body: outer diameter
Inner diameter
Height 251 mm; the specification of the top cover is as follows: 70mm in thickness, 95mm in diameter of the upper end surface of the vertebral body, 120 degrees in taper, 190mm in diameter of the lower end surface and an opening at the center
An aperture; the diameter of the bottom cover is 190mm, the thickness of the bottom cover is 40mm, and ribs with the width of 2mm and the thickness of 1mm are distributed on the cylindrical surfaces of the top cover and the bottom cover.
Step four: wrapping the titanium-aluminum alloy cast ingot with the diameter of 150 multiplied by 250mm prepared in the step two by high silica cloth with the thickness of 0.5mm, putting the titanium-aluminum alloy cast ingot into the cylinder prepared in the step three, and welding the top cover and the bottom cover on the cylinder to obtain the jacket extrusion blank with the diameter of 190 multiplied by 360 mm.
Step five: putting the sheath extrusion blank obtained in the step four into a heating furnace for heating, wherein the heating temperature is 1300 ℃, and the heat preservation time is 4 hours;
step six: after the heat preservation is finished, the sheathed extrusion blank is put into a glass protective lubricant to roll back and forth for 2 times, after the glass protective lubricant powder on the surface of the blank is uniformly coated, the blank is put into an extrusion die to be extruded, the extrusion ratio is 4, the extrusion speed is 8mm/s, and the bar material with the phi 95 multiplied by 1450mm specification obtained by extrusion is wrapped by heat preservation cotton and slowly cooled to the room temperature.
Step seven: removing the sheath of the bar obtained in the sixth step to obtain the Ti47.5Al2.5V1Cr alloy bar with the specification of phi 70 multiplied by 1000 mm.
Example 4
Taking the preparation of a Ti48Al7Nb2.5V1Cr alloy bar as an example, the preparation steps are as follows:
the method comprises the following steps: preparing a Ti48Al7Nb2.5V1Cr alloy ingot by a vacuum consumable arc melting method, melting the first two times by a conventional method, controlling the cooling water temperature at 40 ℃ during the third melting, cooling for 1.5h, wrapping the alloy ingot with heat preservation cotton after the alloy ingot is taken out of the furnace, and cooling to room temperature, wherein the specification of the prepared Ti48Al7Nb2.5V1Cr alloy ingot is phi 280 mm.
Step two: cutting off 100mm from the head and the tail of the ingot prepared in the step one, peeling to phi 270mm, wherein the surface roughness of the ingot is less than or equal to 1.6 mu m, checking the macrostructure of the head and the tail end, and cutting 270mm length from the ingot as an extrusion blank when the macrostructure is a radial dendritic crystal structure.
Step three: manufacturing a sheath, and the specification of a cylinder body: outer diameter
Inner diameter
Height 271 mm; the specification of the top cover is as follows: 80mm in thickness, 160mm in diameter of the upper end surface of the vertebral body, 120 degrees in taper, 320mm in diameter of the lower end surface and an opening at the center
An aperture; the diameter of the bottom cover is 320mm, the thickness of the bottom cover is 50mm, and ribs with the width of 2mm and the thickness of 1mm are distributed on the cylindrical surfaces of the top cover and the bottom cover.
Step four: wrapping the titanium-aluminum alloy ingot prepared in the step two with phi 270X 270mm by high silica cloth with the thickness of 0.5mm, putting the wrapped titanium-aluminum alloy ingot into the barrel prepared in the step three, and welding the top cover and the bottom cover on the barrel to obtain a jacket extrusion blank with phi 320X 400 mm.
Step five: and (5) heating the sheath extrusion blank obtained in the step four in a heating furnace at the heating temperature of 1400 ℃ for 5 hours.
Step six: after the heat preservation is finished, the sheathed extrusion blank is put into a glass protective lubricant to roll back and forth for 2 times, after the glass protective lubricant on the surface of the blank is uniformly adhered, the blank is put into an extrusion die to be extruded, the extrusion ratio is 4, the extrusion speed is 3mm/s, and the bar material with the specification of phi 160 multiplied by 1600mm obtained by extrusion is wrapped by heat preservation cotton and slowly cooled to the room temperature.
Step seven: removing the sheath of the bar obtained in the sixth step to obtain the Ti48Al7Nb2.5V1Cr alloy bar with the specification of phi 130 multiplied by 1050 mm.
Claims (8)
1. The extrusion preparation method of the titanium-aluminum alloy bar sheath is characterized by comprising the following steps:
the method comprises the following steps: preparing a titanium-aluminum alloy ingot by adopting a vacuum consumable arc melting method; the smelting frequency is three times, the temperature of crucible cooling water is controlled to be 40-45 ℃ during the third smelting, the cooling time of the cast ingot is 1-1.5 h, the cast ingot is wrapped by heat preservation cotton after being taken out of the furnace, and the cast ingot is slowly cooled to the room temperature;
step two: cutting off the head and the tail of the titanium-aluminum alloy ingot prepared in the step one by 100-150 mm, and then polishing the surface of the ingot and the surfaces of the head and the tail ends, wherein the surface roughness is less than or equal to 1.6 mu m; the macrostructure of the head end and the tail end of the ingot is radial dendritic crystal structure and has no crack;
step three: wrapping the titanium-aluminum alloy cast ingot 6 obtained in the step two by using high silica cloth, and then putting the wrapped ingot into a sheath to obtain a sheath extrusion blank; wherein the thickness of the high silica cloth is 0.5-1 mm;
step four: heating the sheathed extrusion blank in a heating furnace at 1300-1400 ℃ for 4-5 h;
step five: and after the heat preservation is finished, placing the sheathed extrusion blank into a glass protection lubricant to roll for 2-3 times, extruding after the glass protection lubricant is uniformly adhered to the surface of the blank, cooling after the extrusion, and removing the sheath to obtain the titanium-aluminum alloy bar.
2. The method for preparing the titanium-aluminum alloy bar sheath by extrusion as recited in claim 1, wherein in the second step, if the macrostructure of the head end face and the tail end face of the ingot does not meet the conditions of radial dendritic crystal structure and no crack, the ingot is cut off until the conditions are met.
3. The method for preparing the titanium-aluminum alloy bar by sheath extrusion in the claim 1, wherein in the third step, the length of the sheath extrusion blank is 300-400 mm.
4. The extrusion preparation method of the titanium-aluminum alloy bar sheath according to claim 1, wherein in the third step, the sheath comprises a barrel (3), a top cover (1) and a bottom cover (4), the top cover (1) is arranged at the top of the barrel (3), and the bottom cover (4) is arranged at the bottom of the barrel (3).
5. The extrusion preparation method of the titanium-aluminum alloy bar sheath according to claim 4, characterized in that the thickness of the cylinder (3) is 19-25 mm; the top cover (1) is of a conical structure, the taper is 120 degrees, the thickness is 60-80 mm, and the top cover (1) is provided with vent holes (2); the thickness of the bottom cover (4) is 30-40 mm.
6. The extrusion preparation method of the titanium-aluminum alloy bar sheath according to claim 4, characterized in that the cylindrical surfaces of the top cover (1) and the bottom cover (4) are circumferentially provided with annular ribs (7) with the width of 2-3 mm and the thickness of 0.5-1.5 mm.
7. The extrusion preparation method of the titanium-aluminum alloy bar sheath according to claim 1, characterized in that in the third step, the roughness of the surface of the sheath in contact with the titanium-aluminum ingot is less than or equal to 1.6 μm, and the roughness of the remaining surface is 6.3-12.6 μm; the sheath material is titanium or titanium alloy.
8. The method for preparing the titanium-aluminum alloy bar by sheath extrusion as recited in claim 1, wherein the extrusion ratio is 3-4, and the extrusion speed is 3-10 mm/s.
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| CN112958626A (en) * | 2021-02-04 | 2021-06-15 | 西北工业大学 | Sheath suitable for rolling TiAl alloy and preparation method thereof |
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