CN117259755A - Preparation method of large-size TC18 titanium alloy thin-wall part - Google Patents
Preparation method of large-size TC18 titanium alloy thin-wall part Download PDFInfo
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- CN117259755A CN117259755A CN202311239962.8A CN202311239962A CN117259755A CN 117259755 A CN117259755 A CN 117259755A CN 202311239962 A CN202311239962 A CN 202311239962A CN 117259755 A CN117259755 A CN 117259755A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 49
- 238000003466 welding Methods 0.000 claims abstract description 41
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000003754 machining Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 5
- 238000010894 electron beam technology Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000009489 vacuum treatment Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 12
- 238000011049 filling Methods 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001040 Beta-titanium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F2005/103—Cavity made by removal of insert
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a preparation method of a large-size TC18 titanium alloy thin-wall part, which comprises the following steps: 1) Pulverizing with bar materials according to nominal components of TC18 titanium alloy, sieving, selecting TC18 titanium alloy powder with a set particle size section, mixing, and taking as raw materials; 2) Manufacturing a sheath and a core with corresponding specifications; 3) Vacuumizing and sealing welding the sheath after powder filling; 4) Performing hot isostatic pressing treatment; 5) Machining to remove the sheath and the steel core to obtain a blank; 6) Performing heat treatment and finish machining on the blank to obtain a TC18 titanium alloy thin-wall part with a target size; while strictly controlling the parameters involved in each step of the preparation process. The invention finally obtains the large-size TC18 titanium alloy thin-wall part with uniform composition, high plasticity and low cost through the working procedures of smelting, powder preparation, powder filling, hot isostatic pressing, heat treatment, finish machining and the like, and simultaneously, the utilization rate of materials is obviously improved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material processing and forming, and particularly relates to a preparation method of a large-size TC18 titanium alloy thin-wall part.
Background
The TC18 titanium alloy is a high-alloying high-strength near-beta titanium alloy, the nominal component of the TC18 titanium alloy is Ti-5Al-5Mo-5V-1Cr-1Fe (mass fraction)%, and the strength of the TC18 titanium alloy can reach 1080MPa in an annealed state; after the strengthening heat treatment, the strength can be improved to 1300MPa. The TC18 titanium alloy is regarded as an ideal structural material in the field of aviation and aerospace manufacturing due to the advantages of small density, high strength, high plasticity, good hardenability and the like, and for example, a manufactured thin-wall cylindrical part is a main structural form of a metal shell of a solid rocket engine.
At present, the application of the TC18 titanium alloy mainly takes a forging as a main part, and in the hot working process, the TC18 titanium alloy is easy to have defects of uneven structure, local overheating, heat insulation shearing bands and the like, and the forming and structure control of parts are difficult. Particularly, a thin-wall part (the thickness is less than or equal to 3.5 mm) with a large size (the diameter is more than or equal to 150mm and the length is more than or equal to 700 mm) is usually machined by adopting a forging machine, on one hand, the structure of a large-size forging rod (the diameter is more than or equal to 300 mm) is difficult to control, the defect of uneven structure easily occurs, and on the other hand, the yield of the material is usually lower than 10% by adopting a machining mode, and the waste is serious; welding is usually required to prepare long pipes at the same time, but titanium and titanium alloys have strong absorption of hydrogen, oxygen and nitrogen by liquid droplets and molten pool metals during welding, and in the solid state, these gases have acted on them. With the rise of temperature, the capability of absorbing hydrogen, oxygen and nitrogen of titanium and titanium alloy is obviously increased, the capability of absorbing hydrogen is started to be about 250 ℃, the capability of absorbing oxygen is started to be about 400 ℃, the capability of absorbing nitrogen is started to be about 600 ℃, and the capability of absorbing nitrogen directly causes embrittlement of a welding joint after the gases are absorbed, which is an important factor for causing welding defects of titanium and titanium alloy. The welding performance of titanium and titanium alloys is such that both defects of pinholes and cracks are easily generated in the actual welding. Therefore, the performance of the long thin-wall pipe fitting finally obtained by welding is difficult to guarantee. In addition, although the hot isostatic pressing technology has been used to produce titanium alloy related parts, there is no mature method for producing large-size TC18 titanium alloy thin-wall parts due to the easy deformation of thin-wall pipe fittings and the difficulty in size control.
In view of the above, the present inventors have proposed a method for manufacturing a large-sized TC18 titanium alloy thin-walled component, so as to overcome the drawbacks of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a preparation method of a large-size TC18 titanium alloy thin-wall part, which mainly solves the defects of complicated forming process, uneven structure, local overheating, heat insulation shearing band and the like of the traditional method for preparing the large-size TC18 titanium alloy thin-wall part, and simultaneously avoids the influence of welding on the performance of a long thin-wall pipe fitting.
The invention aims at solving the problems by the following technical scheme:
a preparation method of a large-size TC18 titanium alloy thin-wall part comprises the following steps:
firstly, smelting a bar for powder preparation through vacuum induction according to nominal components of TC18 titanium alloy, preparing TC18 titanium alloy powder by adopting a plasma rotating electrode, screening the prepared TC18 titanium alloy powder, and selecting TC18 titanium alloy powder with a set particle size section to be mixed as a raw material;
step two, designing and manufacturing a corresponding sheath according to the specification of the thin-wall part to be processed, and adopting round steel as a core;
step three, cleaning and drying the sheath and the core in the step two, then loading the TC18 titanium alloy powder raw material selected in the step one into the sheath on a vibration platform, and carrying out vacuum treatment and electron beam seal welding on the sheath loaded with the TC18 titanium alloy powder raw material;
step four, performing hot isostatic pressing treatment on the sheath subjected to sealing welding in the step three to obtain a hot isostatic pressing blank;
step five, machining the hot isostatic pressing blank obtained in the step four to remove the sheath and the steel core, thereby obtaining a TC18 titanium alloy thin-wall part blank;
and step six, carrying out heat treatment on the TC18 titanium alloy thin-wall part blank obtained in the step five, and carrying out finish machining on the TC18 titanium alloy thin-wall part blank after the heat treatment is finished, thereby obtaining the TC18 titanium alloy thin-wall part with the target size.
Further, the granularity of the TC18 titanium alloy powder raw material selected in the step one is 15-150 mu m, and the oxygen increment in the raw material is controlled to be 50-150 ppm.
Further, when the sheath is subjected to vacuum treatment in the third step, the vacuum degree of the sheath is required to be less than or equal to 5.0x10 - 3 Pa。
Further, when the sheath is subjected to electron beam sealing welding in the third step, the welding current is 50 mA-90 mA, the welding speed is 140 DEG/min-260 DEG/min, and the welding times are 2-3 times.
Further, in the step four, when the sheath is subjected to hot isostatic pressing, the temperature is set to 800-900 ℃, the time is set to 2-3 h, and the pressing pressure is set to 120-150 MPa.
Further, in the sixth step, when the TC18 titanium alloy thin-wall part blank is subjected to heat treatment, the temperature is set to 800-820 ℃, the heat preservation time is 3-5 h, and finally air cooling is carried out to room temperature.
Further, the preparation method is used for preparing: the diameter is more than or equal to 150mm, the length
TC18 titanium alloy cylindrical thin-wall parts with the thickness of more than or equal to 700mm and less than or equal to 3.5 mm.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method of the invention uses TC18 metal spherical powder with high purity and specific size as raw materials, round steel as a core and steel as a sheath, the blank is obtained by vacuum treatment, electron beam sealing welding, hot isostatic pressing and machining sheath removal after powder filling, and the large-size TC18 titanium alloy thin-wall part meeting the requirements of components, tissues, strength and plasticity is obtained after the blank is subjected to heat treatment, and the material utilization rate of the powder is more than or equal to 50%. Compared with the prior art, the method overcomes the defects of complex forming process, non-uniform structure, high material utilization rate, high cost and the like of the traditional forging, avoids the welding process, and improves the structure and performance of the large-size TC18 titanium alloy thin-wall part.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate principles of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for manufacturing a large-size TC18 titanium alloy thin-walled component of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of devices that are consistent with aspects of the invention that are set forth in the following claims.
The present invention will be described in further detail below with reference to the drawings and examples for better understanding of the technical solutions of the present invention to those skilled in the art.
Referring to fig. 1, the invention provides a method for preparing a large-size TC18 titanium alloy thin-wall part, which comprises the following steps:
firstly, smelting a bar for powder preparation through vacuum induction according to nominal components of TC18 titanium alloy, preparing TC18 titanium alloy powder by adopting a plasma rotary electrode, screening the prepared TC18 titanium alloy powder, and selecting TC18 titanium alloy powder with a set particle size section to be mixed as a raw material.
Specifically, the granularity of the TC18 titanium alloy powder raw material selected by the invention is 15-150 mu m, and the oxygen increment in the raw material is controlled to be 50-150 ppm.
And secondly, designing and manufacturing a corresponding sheath according to the specification of the thin-wall part to be processed, and adopting round steel as a core.
And thirdly, cleaning and drying the sheath and the core in the second step, then loading the TC18 titanium alloy powder raw material selected in the first step into the sheath on a vibration platform, and carrying out vacuum treatment and electron beam seal welding on the sheath loaded with the TC18 titanium alloy powder raw material.
Wherein, when the sheath is subjected to vacuum treatment, the vacuum degree of the sheath is required to be less than or equal to 5.0x10 -3 Pa. When the envelope is subjected to electron beam sealing welding, the welding current is 50 mA-90 mA, the welding speed is 140 DEG/min-260 DEG/min, and the welding times are 2-3 times.
And fourthly, performing hot isostatic pressing treatment on the sheath subjected to the sealing welding in the third step to obtain a hot isostatic pressing blank.
Specifically, when the sheath is subjected to hot isostatic pressing, the temperature is set to 800-900 ℃, the time is set to 2-3 h, the pressing pressure is set to 120-150 MPa, and the surface of the pressed sheath has no defects such as bulges and the like.
And fifthly, machining the hot isostatic pressing blank obtained in the step four to remove the sheath and the steel core, thereby obtaining the TC18 titanium alloy thin-wall part blank.
Specifically, when the TC18 titanium alloy thin-wall part blank is subjected to heat treatment, the temperature is set to 800-820 ℃, the heat preservation time is 3-5 h, and finally the blank is air-cooled to room temperature
And step six, carrying out heat treatment on the TC18 titanium alloy thin-wall part blank obtained in the step five, and carrying out finish machining on the TC18 titanium alloy thin-wall part blank after the heat treatment is finished, thereby obtaining the TC18 titanium alloy thin-wall part with the target size.
To further verify the efficacy of the preparation method of the present invention, the inventors performed the following specific examples:
example 1 (preparation of phi Outer part 278/Ф Inner part 272 x 1500mm cylinder
Preparing a product with a size phi Outer part 278/Ф Inner part 272 x 1500mm TC18 titanium alloy thin wall (wall thickness 3 mm) cylindrical member, the specific manufacturing steps are as follows:
1) According to the nominal component requirement of TC18 titanium alloy, adopting vacuum induction smelting to obtain TC18 bar material for powder preparation, the specific size is phi 80 mm by 700mm; preparing spherical powder by adopting a plasma rotating electrode, setting the rotating speed to 15000r/min, screening the prepared TC18 titanium alloy powder, selecting the titanium alloy powder with the granularity of 45-120 mu m as a raw material, and controlling the oxygen increment in the raw material to be 110ppm;
2) Designing and manufacturing a steel ladle and a core, wherein: the steel ladle has the size phi Outer part 294/Ф Inner part 262 x 1700mm, steel ladle thickness 5mm; the core size is phi 261mm x 1700mm;
3) Cleaning the sheath, removing impurities on the surface, drying, and then wrapping powder on a vibration platform during powder filling;
4) Vacuum processing and electron beam sealing welding are carried out on the powder-filled sheath, and the vacuum degree is less than or equal to 5.0 multiplied by 10 -3 Pa, welding current 70mA, welding speed 200 DEG/min, and welding times 3 times;
5) Performing hot isostatic pressing treatment on the sealed and welded sheath, wherein the temperature during the hot isostatic pressing treatment is 850 ℃, the time is 2.5h, and the pressing pressure is 140MPa;
6) Machining the blank subjected to the hot isostatic pressing until the steel sheath and the core on the surface of the titanium alloy are removed completely, wherein the size of the blank is phi 281/phi 272 x 1520mm;
7) Aging heat treatment is carried out on the obtained titanium alloy blank, the aging treatment temperature is 810 ℃, and air cooling is carried out to room temperature after heat preservation for 4 hours;
8) Finishing the outer surface of the titanium alloy blank after aging treatment to finally obtain the titanium alloy blank with the dimension phi Outer part 278/Ф Inner part 272 x 1500mm target cartridge, the cartridge material utilization reached 60.5%.
In order to further verify the mechanical properties of the TC18 titanium alloy cylindrical part prepared by the preparation method, the inventor tests that the tensile strength is 1210MPa, the yield strength is 1120MPa and the elongation is 6% at normal temperature, so that the design requirement is completely met.
Example 2 (preparation of phi Outer part 270/Ф Inner part 263 x 2000mm cylinder
1) According to the nominal component requirement of TC18 titanium alloy, adopting vacuum induction smelting to obtain TC18 bar material for powder preparation, the specific size is phi 80 mm by 700mm; preparing spherical powder by adopting a plasma rotating electrode, setting the rotating speed to 14000r/min, screening the prepared TC18 titanium alloy powder, and selecting titanium alloy powder with the granularity of 15-80 mu m as a raw material after mixing, wherein the oxygen increment in the raw material is controlled to be 150ppm;
2) Designing and manufacturing a steel ladle and a core, wherein: the steel ladle has the size phi Outer part 285/Ф Inner part 257 x 2000mm, the steel ladle thickness is 4.5mm; the core size is phi 256mm x 2020mm;
3) Cleaning the sheath, removing impurities on the surface, drying, and then wrapping powder on a vibration platform during powder filling;
4) Vacuum processing and electron beam sealing welding are carried out on the powder-filled sheath, and the vacuum degree is less than or equal to 5.0 multiplied by 10 -3 Pa, welding current 90mA, welding speed 260 DEG/min, and welding times 3 times;
5) Performing hot isostatic pressing treatment on the sealed and welded sheath, wherein the temperature during the hot isostatic pressing treatment is 800 ℃, the time is 3 hours, and the pressing pressure is 150MPa;
6) Machining the blank subjected to the hot isostatic pressing until the steel sheath and the core on the surface of the titanium alloy are removed completely, wherein the size of the blank is phi 273/phi 260 x 2020mm;
7) Aging heat treatment is carried out on the obtained titanium alloy blank, the aging treatment temperature is 820 ℃, and air cooling is carried out to room temperature after heat preservation for 3 hours;
8) Finishing the outer surface of the titanium alloy blank after aging treatment to finally obtain the titanium alloy blank with the dimension phi Outer part 270/Ф Inner part 263 x 2000mm target cartridge, which has a material utilization of 64.2%.
In order to further verify the mechanical properties of the TC18 titanium alloy cylindrical part prepared by the preparation method, the inventor tests that the tensile strength is 1188MPa, the yield strength is 1098MPa and the elongation is 8.1% at normal temperature, so that the design requirement is completely met.
Example 3 (preparation of phi Outer part 260/Ф Inner part 255 x 180mm cylinder
1) According to the nominal component requirement of TC18 titanium alloy, adopting vacuum induction smelting to obtain TC18 bar material for powder preparation, the specific size is phi 80 mm by 700mm; preparing spherical powder by adopting a plasma rotating electrode, setting the rotating speed to 14000r/min, screening the prepared TC18 titanium alloy powder, selecting the titanium alloy powder with the granularity of 90-150 mu m as a raw material, and controlling the oxygen increment in the raw material to be 50ppm;
2) Designing and manufacturing a steel ladle and a core, wherein: the steel ladle has the size phi Outer part 273/Ф Inner part 246 x 180mm, steel ladle thickness 5mm; the core size is Φ245mmx 1820mm;
3) Cleaning the sheath, removing impurities on the surface, drying, and then wrapping powder on a vibration platform during powder filling;
4) Vacuum processing and electron beam sealing welding are carried out on the powder-filled sheath, and the vacuum degree is less than or equal to 5.0 multiplied by 10 -3 Pa, welding current 50mA, welding speed 140 DEG/min, and welding times 2 times;
5) Performing hot isostatic pressing treatment on the sealed and welded sheath, wherein the temperature during the hot isostatic pressing treatment is 900 ℃, the time is 2 hours, and the pressing pressure is 120MPa;
6) Machining the blank subjected to the hot isostatic pressing until the steel sheath and the core on the surface of the titanium alloy are removed completely, wherein the size of the blank is phi 263/phi 252.5 x 1810mm;
7) Aging heat treatment is carried out on the obtained titanium alloy blank, the aging treatment temperature is 800 ℃, and air cooling is carried out to room temperature after heat preservation is carried out for 5 hours;
8) Finishing the outer surface of the titanium alloy blank after aging treatment to finally obtain the titanium alloy blank with the dimension phi Outer part 260/Ф Inner part 255 x 180mm target cartridge, which has a material utilization of 57.5%.
In order to further verify the mechanical properties of the TC18 titanium alloy cylindrical part prepared by the preparation method, the inventor tests that the tensile strength is 1178MPa at normal temperature, the yield strength is 1102MPa, and the elongation is 6.8 percent, so that the design requirement is completely met.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It will be understood that the invention is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. The preparation method of the large-size TC18 titanium alloy thin-wall part is characterized by comprising the following steps of:
firstly, smelting bars for powder preparation through vacuum induction according to nominal components of TC18 titanium alloy, preparing TC18 titanium alloy powder by adopting a plasma rotary electrode, screening the prepared TC18 titanium alloy powder, and selecting TC18 titanium alloy powder with a set particle size section to be mixed as a raw material;
step two, designing and manufacturing a corresponding sheath according to the specification of the thin-wall part to be processed, and adopting round steel as a core;
step three, cleaning and drying the sheath and the core in the step two, then loading the TC18 titanium alloy powder raw material selected in the step one into the sheath on a vibration platform, and carrying out vacuum treatment and electron beam seal welding on the sheath loaded with the TC18 titanium alloy powder raw material;
step four, performing hot isostatic pressing treatment on the sheath subjected to sealing welding in the step three to obtain a hot isostatic pressing blank;
step five, machining the hot isostatic pressing blank obtained in the step four to remove the sheath and the steel core, thereby obtaining a TC18 titanium alloy thin-wall part blank;
and step six, carrying out heat treatment on the TC18 titanium alloy thin-wall part blank obtained in the step five, and carrying out finish machining on the TC18 titanium alloy thin-wall part blank after the heat treatment is finished, thereby obtaining the TC18 titanium alloy thin-wall part with the target size.
2. The method for manufacturing a large-size TC18 titanium alloy thin wall part according to claim 1, wherein the particle size of the TC18 titanium alloy powder raw material selected in said step one is 15 μm to 150 μm, and the oxygen increment in said raw material is controlled to be 50ppm to 150ppm.
3. The method for manufacturing a large-sized TC18 titanium alloy thin wall part according to claim 1, wherein when said step three is performed vacuum treatment, vacuum degree of said jacket is required
≤5.0×10 -3 Pa。
4. The method for manufacturing a large-size TC18 titanium alloy thin-walled component according to claim 1, wherein in the third step, when the sheath is subjected to electron beam sealing welding, the welding current is 50mA to 90mA, the welding speed is 140 °/min to 260 °/min, and the number of times of welding is 2 to 3.
5. The method for manufacturing a large-size TC18 titanium alloy thin-walled component according to claim 1, wherein in the step four, when the sheath is subjected to hot isostatic pressing, the temperature is set to 800 ℃ to 900 ℃, the time is set to 2h to 3h, and the pressing pressure is set to 120MPa to 150MPa.
6. The method for manufacturing a large-size TC18 titanium alloy thin-walled component according to claim 1, wherein in the sixth step, when the TC18 titanium alloy thin-walled component blank is heat treated, the temperature is set to 800 ℃ to 820 ℃, the heat preservation time is set to 3h to 5h, and finally air cooling is performed to room temperature.
7. The method for manufacturing a large-size TC18 titanium alloy thin wall part according to any one of claims 1 to 6, wherein said method for manufacturing is for manufacturing: TC18 titanium alloy cylindrical thin-wall parts with diameters of more than or equal to 150mm, lengths of more than or equal to 700mm and thicknesses of less than or equal to 3.5 mm.
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