Method for prolonging fatigue life of metal material

A metal material, fatigue life technology, applied in the field of laser processing, can solve the problems of low bonding strength between coating and substrate, prone to microcracks, poor compactness, etc., to improve fretting fatigue life, improve thermal fatigue performance, and residual stress. big effect

Inactive Publication Date: 2015-12-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO obtained by this method 2 The coating has good thermal stability, corrosion resistance and wear resistance, but there are problems such as poor compactness, pron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Take TC11 titanium alloy as an example (TC11 is a nearly α+β two-phase titanium alloy, which is an important aviation and aerospace material. This alloy has the advantages of high specific strength, good medium temperature performance, good corrosion resistance, and light weight. It has been used for parts such as compressor discs, blades and drums of aviation motives and aircraft structural parts).

[0025] 1. Use an ultrasonic cleaner to clean the surface of the TC11 titanium alloy in absolute ethanol, and then put the TC11 titanium alloy in a heat treatment furnace to adjust the appropriate temperature for heat treatment. The β-phase transition temperature of the alloy was determined by X-ray diffraction analysis to be 1000±20°C, and it was subjected to double annealing heat treatment, that is, it was kept at 950°C for 1 hour and cooled in air. Keep at 580℃ for 6h, air cooling. A continuous layer of TiO can be formed on its surface 2 +A1 2 O 3 Mixed o...

Example Embodiment

[0029] Example 2

[0030] Take AZ91D magnesium alloy as an example (AZ91D magnesium alloy is a near-α+β-type two-phase magnesium alloy, used for aero engine parts, aircraft frames, landing gear and missile parts, as well as automobile parts such as steering wheels, instrument panels, and transmission boxes. There are also shells for electronic products. It has high specific strength and specific rigidity, and is the lightest structural material in engineering applications; and has good casting and cutting performance, as well as high vibration absorption and electromagnetic shielding characteristics).

[0031] 1. Use an ultrasonic cleaner to clean the surface of AZ91D magnesium alloy in absolute ethanol, and then put the AZ91D magnesium alloy in a heat treatment furnace to adjust the appropriate temperature for heat treatment; that is, keep it at 300℃ for 2 hours, and then air cool , An oxide film can be formed on the surface, which can enhance the bonding ability of the silicide c...

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PUM

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Abstract

The invention provides a method for prolonging the fatigue life of a metal material. Laser shock processing is performed on the material surface with a silicide ceramic coating to enable the high-amplitude residual compressive stress and high dislocation density to be formed on the material surface, and therefore the compactness of the surface coating and the bonding strength between the coating and a substrate can be improved; meanwhile, generation of cracks can be prevented, and the spreading rate of generated cracks is reduced; due to the fact that the high abrasive resistance, corrosion resistance and high temperature oxidation resistance of the metal material are simultaneously achieved, the fatigue life of the metal material on the high temperature condition is prolonged.

Description

Technical field [0001] The invention belongs to the field of laser processing, and in particular is a method for improving the fatigue life of metal materials. Background technique [0002] Laser shock strengthening (LSP) is a technology that uses laser shock waves to modify the surface of materials and improve their fatigue, wear and stress corrosion resistance. The principle is that the shock wave induced by high-energy short-pulse laser interacts with the material to form a plastic deformation layer on the surface of the metal material, so that the fatigue strength and hardness of the metal material can be improved, especially the fatigue life. This technology has been widely used in various industries such as aviation, shipbuilding, mechanical engineering, microelectronics, etc. At present, this technology is mainly used for material modification, metal impact strengthening and forming, and non-destructive testing. [0003] At present, there are many methods of surface modific...

Claims

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Application Information

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IPC IPC(8): C21D10/00
Inventor 任旭东黄晶晶周王凡罗春晖任云鹏佟艳群孙建荣徐士东吴教义
Owner JIANGSU UNIV
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