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CN-122012966-A - High-strength and high-toughness titanium alloy component and short-flow powder metallurgy preparation method thereof

CN122012966ACN 122012966 ACN122012966 ACN 122012966ACN-122012966-A

Abstract

The invention belongs to the technical field of titanium alloy preparation, and particularly discloses a high-strength and high-toughness titanium alloy component and a short-flow powder metallurgy preparation method thereof, which comprises the steps of uniformly mixing titanium powder and alloy element powder to obtain mixed powder; the method comprises the steps of carrying out cold isostatic pressing on mixed powder to obtain a green body, carrying out vacuum sintering on the green body to obtain a titanium alloy sintered ingot, and carrying out hot isostatic pressing on the titanium alloy sintered ingot at a temperature of 10-200 ℃ below a transformation point to obtain a titanium alloy component. According to the invention, through the process route of cold isostatic pressing-sintering-hot isostatic pressing direct powder metallurgy near-net forming, excellent performance which is not inferior to that of forging titanium alloy is obtained, the production cost is reduced by more than 50%, and the preparation of a titanium alloy component with short flow, low cost and high performance is realized.

Inventors

  • LI NING
  • LI YUHAO
  • CHEN ZHENWEI
  • LUO XUAN
  • ZHAO CHAO
  • LI YUANYUAN

Assignees

  • 华中科技大学

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. A short-process powder metallurgy preparation method of a high-strength and high-toughness titanium alloy component is characterized by comprising the following steps of: s1, uniformly mixing titanium powder and alloy element powder to obtain mixed powder; S2, carrying out cold isostatic pressing on the mixed powder to obtain a green body; S3, carrying out vacuum sintering on the green body to obtain a titanium alloy sintered ingot; and S4, performing hot isostatic pressing treatment on the titanium alloy sintered ingot at the temperature of 10-200 ℃ below the phase transition point to obtain the titanium alloy component.
  2. 2. The method for preparing a high strength and toughness titanium alloy member according to claim 1, wherein in step S4, the hot isostatic pressure is 100-300 mpa, and the dwell time is 120-240 min.
  3. 3. The short-process powder metallurgy preparation method of the high-strength and high-toughness titanium alloy component according to claim 1, wherein in the step S4, the hot isostatic pressing cooling speed is designed to be 3 temperature sections, namely, the cooling speed is 5-10 ℃ per hour from the hot isostatic pressing temperature to 400 ℃, the cooling speed is 10-20 ℃ per hour from 400 ℃ to 300 ℃, and the natural air cooling speed is lower than 300 ℃.
  4. 4. The method for preparing the high-strength and high-toughness titanium alloy component by the short-process powder metallurgy according to claim 1, wherein in the step S3, the sintering temperature is 1000-1500 ℃, and the heat preservation time is 2-8 hours.
  5. 5. The method for preparing the high-strength and high-toughness titanium alloy component by the short-process powder metallurgy, which is characterized in that in the step S3, the sintering temperature rise speed is 1-5 ℃ per minute.
  6. 6. The method for preparing high strength and toughness titanium alloy member according to claim 1, wherein the vacuum degree in the sintering process is maintained at 10 -3 Pa in step S3.
  7. 7. The method for preparing a high strength and toughness titanium alloy member according to claim 1, wherein in step S2, the cold isostatic pressure is 100mpa to 300mpa, and the dwell time is 30min to 240min.
  8. 8. The short-process powder metallurgy preparation method of a high-strength and high-toughness titanium alloy component according to any one of claims 1 to 7, wherein the particle size of titanium powder is 5 μm to 150 μm and the oxygen content is not more than 0.15%.
  9. 9. The short-flow powder metallurgy preparation method of a high-strength and high-toughness titanium alloy component according to any one of claims 1 to 7, wherein the granularity of the alloy element powder is 5 μm to 100 μm and the oxygen content is not more than 0.12%.
  10. 10. A high strength and toughness titanium alloy component, characterized in that it is prepared by the short-flow powder metallurgy preparation method of the high strength and toughness titanium alloy component according to any one of claims 1 to 9.

Description

High-strength and high-toughness titanium alloy component and short-flow powder metallurgy preparation method thereof Technical Field The invention belongs to the technical field of titanium alloy preparation, and particularly relates to a high-strength and high-toughness titanium alloy component and a short-flow powder metallurgy preparation method thereof. Background The titanium alloy has excellent specific strength, fracture toughness and fatigue resistance, excellent corrosion resistance, good high-temperature and low-temperature properties and has important roles in the fields of aerospace, navigation, petrochemical industry and the like. But its expensive price is always the most critical factor limiting its further development. The current mainstream method of titanium alloy components is to produce by casting-forging, wherein the cost mainly comprises the following parts of 1, material cost, mainly comprising raw material cost of sponge titanium and alloy elements and cost of producing cast ingots by multiple times of vacuum melting, 2, production process cost comprising forging cost and heat treatment cost, wherein the forging cost accounts for 30% -40%, and 3, machining cost accounts for 15% -20%. In order to reduce the production cost of titanium alloys, researchers have developed techniques for producing titanium alloy components by the mixed element method. The method realizes near net shape forming of the titanium alloy component through powder mixing, pressing and sintering, and has finer grains, more uniform structure and lower energy consumption and cost compared with the traditional casting method. However, the properties of directly sintered components often fail to meet the requirements due to the internal porosity, and the process of forging and heat treatment is generally continued to achieve complete densification and tissue optimization, which clearly adds to the cost. Thus, there is a need for a low cost method of obtaining fully dense, high performance, near net shape titanium alloy components. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a high-strength and high-toughness titanium alloy component and a short-flow powder metallurgy preparation method thereof, and aims to prepare the high-strength and high-toughness titanium alloy component in a short flow and at low cost. In order to achieve the above object, according to an aspect of the present invention, a short-flow powder metallurgy preparation method of a high-strength and high-toughness titanium alloy member is provided, comprising the steps of: s1, uniformly mixing titanium powder and alloy element powder to obtain mixed powder; S2, carrying out cold isostatic pressing on the mixed powder to obtain a green body; S3, carrying out vacuum sintering on the green body to obtain a titanium alloy sintered ingot; and S4, performing hot isostatic pressing treatment on the titanium alloy sintered ingot at the temperature of 10-200 ℃ below the phase transition point to obtain the titanium alloy component. As a further preferable mode, in the step S4, the hot isostatic pressing pressure is 100-300 MPa, and the holding time is 120-240 min. As a further preferable mode, in the step S4, the hot isostatic pressing cooling speed is designed to be 3 temperature sections, namely, the cooling speed is 5-10 ℃ per hour from the hot isostatic pressing temperature to 400 ℃, the cooling speed is 10-20 ℃ per hour from 400 ℃ to 300 ℃, and the temperature is below 300 ℃ and the hot isostatic pressing is naturally cooled. As a further preferable mode, in the step S3, the sintering temperature is 1000-1500 ℃ and the heat preservation time is 2-8 hours. Further preferably, in step S3, the sintering temperature rise rate is 1-5 ℃ per minute. As a further preferred step S3, the vacuum degree during sintering is maintained at 10 -3 Pa. Further preferably, in step S2, the cold isostatic pressure is 100MPa to 300MPa, and the holding time is 30min to 240min. As a further preferable aspect, the particle size of the titanium powder is 5 μm to 150 μm, and the oxygen content is not more than 0.15%. As a further preferable aspect, the particle size of the alloy element powder is 5 μm to 100 μm, and the oxygen content is not more than 0.12%. According to another aspect of the invention, a high-strength and high-toughness titanium alloy component is provided, and the high-strength and high-toughness titanium alloy component is prepared by adopting the short-flow powder metallurgy preparation method. In general, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages: 1. The invention adopts sintering and hot isostatic pressing to bear the key links of closed pore densification and secondary regulation of structure, specifically realizes component homogenization and structure uniformity through the sintering process, and