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CN-122012965-A - Titanium alloy with enhanced foreign object damage resistance and preparation method thereof

CN122012965ACN 122012965 ACN122012965 ACN 122012965ACN-122012965-A

Abstract

The invention belongs to the technical field of titanium alloy preparation, and particularly discloses a titanium alloy with enhanced anti-damage performance and a preparation method thereof, wherein the titanium alloy comprises, by mass, 4.5% -5.0% of Al, 5.5% -7.0% of total amount of Mo and Cr, 5.0% -7.0% of total amount of Sn and Zr, and the balance of Ti, mixing titanium powder with intermediate alloy powder to obtain mixed powder, cold isostatic pressing the mixed powder into a green compact, vacuum sintering the green compact to obtain a sintered ingot, hot isostatic pressing the sintered ingot to obtain a hot isostatic pressed ingot, pre-forging the hot isostatic pressed ingot to obtain a powder metallurgy forged sample, and heat treating the powder metallurgy forged sample to obtain a titanium alloy component. According to the invention, the content of the beta stabilizing element is optimized by adjusting the alloy components, so that the dynamic impact performance and damage tolerance of the titanium alloy material are improved.

Inventors

  • LI NING
  • LI YUHAO
  • LUO XUAN
  • LI YUANYUAN

Assignees

  • 华中科技大学

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The preparation method of the titanium alloy with the enhanced anti-foreign object damage performance is characterized by comprising the following steps: S1, mixing titanium powder and intermediate alloy powder to obtain mixed powder according to the mass fraction of 4.5% -5.0% of Al, 5.5% -7.0% of total amount of Mo and Cr, 5.0% -7.0% of total amount of Sn and Zr and the balance of Ti; s2, performing cold isostatic pressing on the mixed powder to obtain a green body, and performing vacuum sintering on the green body to obtain a sintered ingot; s3, carrying out hot isostatic pressing treatment on the sintered ingot to obtain a hot isostatic pressing ingot; s4, pre-forging the hot isostatic pressing ingot to obtain a powder metallurgy forging sample; And S5, carrying out heat treatment on the powder metallurgy forging sample to obtain the titanium alloy component.
  2. 2. The method for producing a titanium alloy having enhanced resistance to damage by foreign substances according to claim 1, wherein in step S2, the cold isostatic pressure is 100mpa to 300mpa and the dwell time is 30min to 120min.
  3. 3. The method for preparing the titanium alloy with enhanced anti-damage performance according to claim 1, wherein in the step S2, the sintering temperature is 1300-1400 ℃ and the sintering time is 2-6 h.
  4. 4. The method for preparing the titanium alloy with enhanced anti-damage performance to foreign objects according to claim 1, wherein in the step S3, the hot isostatic pressing temperature is 850-1000 ℃, the pressure is 100-300 MPa, and the holding time is 30-240 min.
  5. 5. The method for preparing the titanium alloy with enhanced anti-damage performance to foreign objects according to claim 1, wherein in the step S4, the pre-forging temperature is 10-60 ℃ below the phase transition point, and the heat preservation time is 60-240 min.
  6. 6. The method for producing a titanium alloy having enhanced resistance to damage by foreign substances according to claim 1, wherein the heat treatment is a solution-aging process in step S5.
  7. 7. The method for preparing the titanium alloy with the enhanced anti-damage performance to foreign objects, which is characterized in that in the step S5, the heat treatment process is specifically that the solution treatment temperature is 30-80 ℃ below the phase transition point, the heat preservation time is 2-4 h, the water quenching cooling is carried out, the aging treatment temperature is 400-700 ℃, the heat preservation time is 4-10 h, and the air cooling is carried out to the room temperature.
  8. 8. The method for preparing the titanium alloy with enhanced anti-foreign object damage performance according to claim 1, wherein the oxygen content of titanium powder is not more than 0.15%, the oxygen content of intermediate alloy powder is not more than 0.12%, and the mixing time in the step S1 is 1-24 h.
  9. 9. The method for preparing the titanium alloy with enhanced anti-foreign object damage performance according to any one of claims 1 to 8, wherein the titanium alloy is prepared by mixing titanium powder with intermediate alloy powder according to the following mass percentages of 4.5% -5.0% of Al, 3.0% -3.5% of Cr, 2.5% -3.5% of Mo, 2.5% -3.5% of Sn, 2.5% -3.0% of Zr and the balance Ti.
  10. 10. A titanium alloy with enhanced resistance to foreign object damage is characterized in that, the titanium alloy is prepared by the preparation method of the anti-foreign object damage performance enhancement titanium alloy as claimed in any one of claims 1 to 9.

Description

Titanium alloy with enhanced foreign object damage resistance and preparation method thereof Technical Field The invention belongs to the technical field of titanium alloy preparation, and in particular relates to a titanium alloy with enhanced foreign object damage resistance and a preparation method thereof. Background High strength and toughness titanium alloys are widely used in critical components of aircraft engines, such as compressor disks and blades. The alloy has excellent high strength, high toughness, good fatigue performance and good high temperature resistance, and has become the first choice material of key components of an aeroengine. However, during high speed rotation, these critical components may draw in micro-sized hard debris and birds in the air, resulting in foreign object damage such as impact pits, micro-cracks, etc. on the surface. The impact load of foreign objects not only directly affects the service performance of the components, but also can become a source of fatigue cracks, so that the engine components fail in advance, and the safety and the reliability of the engine are seriously threatened. At present, the research for improving the damage resistance of the titanium alloy to foreign matters is mainly focused on two major directions, namely, the damage resistance of the surface to the foreign matters is enhanced through surface strengthening treatment such as shot blasting, laser shock strengthening and the like, and the toughness of the material is improved through obtaining a bimodal tissue or a basket tissue microstructure through heat treatment regulation and control. However, the depth of the surface strengthening treatment layer is limited, and the surface strengthening treatment layer can be invalid under multiple impacts, and the structure regulation and control are generally dependent on the regulation of alloy components, but the effect improvement is limited. Therefore, there is a need for a method for preparing titanium alloys that improves the dynamic impact properties of titanium alloys, significantly improves the resistance to foreign object damage, and does not affect other basic properties. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a titanium alloy with enhanced foreign object damage resistance and a preparation method thereof, and aims to improve the foreign object damage resistance of the titanium alloy. In order to achieve the above object, according to an aspect of the present invention, there is provided a method for preparing a titanium alloy having enhanced resistance to damage by foreign materials, comprising the steps of: S1, mixing titanium powder and intermediate alloy powder to obtain mixed powder according to the mass fraction of 4.5% -5.0% of Al, 5.5% -7.0% of total amount of Mo and Cr, 5.0% -7.0% of total amount of Sn and Zr and the balance of Ti; s2, performing cold isostatic pressing on the mixed powder to obtain a green body, and performing vacuum sintering on the green body to obtain a sintered ingot; s3, carrying out hot isostatic pressing treatment on the sintered ingot to obtain a hot isostatic pressing ingot; s4, pre-forging the hot isostatic pressing ingot to obtain a powder metallurgy forging sample; And S5, carrying out heat treatment on the powder metallurgy forging sample to obtain the titanium alloy component. As a further preferable mode, in the step S2, the cold isostatic pressure is 100-300 MPa, and the holding time is 30-120 min. As a further preferable mode, in the step S2, the sintering temperature is 1300-1400 ℃ and the sintering time is 2-6 h. As a further preferable mode, in the step S3, the hot isostatic pressing temperature is 850-1000 ℃, the pressure is 100-300 MPa, and the pressure maintaining time is 30-240 min. As a further preferable mode, in the step S4, the pre-forging temperature is 10-60 ℃ below the phase transition point, and the heat preservation time is 60-240 min. As a further preferred step S5, the heat treatment is a solution-aging process. As a further preferable mode, in the step S5, the heat treatment process is specifically that the solution treatment temperature is 30-80 ℃ below the phase transition point, the heat preservation time is 2-4 h, the water quenching cooling is carried out, the aging treatment temperature is 400-700 ℃, the heat preservation time is 4-10 h, and the air cooling is carried out to the room temperature. As a further preferable mode, the oxygen content of the titanium powder is not more than 0.15%, the oxygen content of the master alloy powder is not more than 0.12%, and the mixing time of the step S1 is 1-24 h. The alloy is further preferably prepared by mixing 4.5% -5.0% of Al, 3.0% -3.5% of Cr, 2.5% -3.5% of Mo, 2.5% -3.5% of Sn, 2.5% -3.0% of Zr and the balance of Ti, and obtaining mixed powder by mixing titanium powder and master alloy powder. According to another aspect of the invention, there is prov