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TC4 alloy surface treatment method

A surface treatment and alloy technology, which is applied in the field of TC4 surface roughness and surface severe plastic deformation layer thickness treatment, can solve the problems of insufficient thickness of severe plastic deformation layer, large roughness TC4 alloy surface, etc., and achieve increased severe plastic deformation Effect of layer thickness and surface roughness reduction

Active Publication Date: 2018-08-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the technical problems that the surface roughness of the TC4 alloy prepared by the prior art is large and the thickness of the severe plastic deformation layer on the surface of the TC4 alloy is insufficient, the invention provides a method for treating the surface of the TC4 alloy

Method used

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Experimental program
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Effect test

Embodiment 1

[0020] A kind of TC4 alloy surface treatment method, concrete steps are as follows:

[0021] (1) Perform stress-relieving annealing treatment on the TC4 alloy sample, the annealing temperature is 600°C, the holding time is 60min, and air-cooled to room temperature;

[0022] (2) Use ASH230 projectiles to carry out the first shot peening treatment on the TC4 alloy sample after stress relief annealing, the air pressure is 0.35MPa, and the shot peening time is 70min;

[0023] (3) Carry out vacuum annealing treatment to the TC4 alloy sample after shot peening, the annealing temperature is 500°C, the holding time is 30min, and the vacuum degree is 5×10 -3 Pa;

[0024] (4) The TC4 alloy sample after vacuum annealing was shot peened for the second time with ASH230 shot, the air pressure was 0.35 MPa, and the shot peening time was 10 min.

[0025] figure 1 and figure 2 The TEM light-field and dark-field photographs of nanocrystals on the surface of the TC4 alloy prepared in Exampl...

Embodiment 2

[0027] According to the preparation method of embodiment 1, change the shot peening time for the second time in step (4) to be 20min, carry out surface treatment to the TC4 alloy sample in the embodiment, the severe plastic deformation layer thickness of this alloy reaches 138 μ m, and the surface roughness is 2.33 μm.

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Abstract

The invention discloses a TC4 alloy surface treatment method. The technical problem about application caused by TC4 surface roughness and surface severe plastic deformation layer thickness is solved.According to the method, the TC4 alloy is subject to first-time distressing annealing treatment and first-time shot blasting treatment firstly, large strain and high-strain-rate severe plastic deformation appear in the TC4 alloy surface layer, and surface nanocrystallization is achieved; the TC4 alloy is subject to vacuum annealing treatment, internal strain is further removed, on the premise thatthe surface nano structure is not obviously roughed, further plastic deformation can be borne, finally, the TC4 alloy obtained after vacuum annealing is subject to second-time shot blasting within short time, surface roughness of the TC4 alloy can be reduced, and the surface severe plastic deforming layer thickness is increased. Through the test, the TC4 alloy surface roughness is reduced to 2.19to 2.33 micrometers from 4.80 micrometers in the prior art, meanwhile, the TC4 alloy surface severe plastic deforming layer thickness is increased to 138 to 171 micrometers from 60 micrometers in theprior art.

Description

technical field [0001] The invention relates to a method for modifying the surface of a titanium alloy. In particular, it involves the treatment method of TC4 surface roughness and the thickness of the surface severe plastic deformation layer. Background technique [0002] As a high-performance lightweight alloy, TC4 alloy has the characteristics of low density, high specific strength, and good corrosion resistance. In the aerospace field, it is mainly used to manufacture fans, compressor disks, and blades of engines, so it mostly serves in high temperature, high pressure, etc. Harsh environment. Fatigue fractures of aeroengine blades are prominent, which is a key and difficult problem that restricts the reliable service of aeroengines and needs to be resolved urgently. Nanomaterials have small grain size and high interfacial density, and exhibit excellent properties that are superior to traditional coarse-grained materials. The preparation of surface nanocrystals by mech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18B24C1/06
CPCB24C1/06C22F1/183
Inventor 刘印刚李淼泉刘洪杰
Owner NORTHWESTERN POLYTECHNICAL UNIV