Composite shot blasting reinforcement process to raise fatigue strength of titanium metal

Abstract

The composite shot blasting reinforcement process to raise the fatigue strength of titanium metal includes one step of eliminating surface attachment and dirt, and one high-energy shot blasting step for surface nanometer treatment and secondary fining treatment. The process can obtain one nanometer surface layer in certain depth and one very deep residual compressive stress field and raise the fatigue strength of the material.

Description

technical field [0001] The present invention relates to a method of spraying abrasives for producing special effects, in particular to the shot peening process of titanium material in the way of continuous impact. Background technique [0002] Titanium and its alloys have high specific strength, excellent corrosion resistance and good high temperature performance, and occupy an increasingly important position in modern aerospace, military industry and civilian industry. However, due to the low fatigue strength, large dispersion and poor wear resistance of titanium and its alloys, their further application in industry is greatly limited. Although a variety of physical and chemical surface modification technologies have been developed to effectively improve the wear resistance of titanium and its alloys, almost all of these methods reduce their fatigue strength. [0003] Shot peening and rolling are recognized methods to improve the fatigue degree of titanium and its alloys. ...

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of titanium and its alloys such as low fatigue strength, large dispersion, and poor wear resistance, their further application in industry is greatly limited.

Although a variety of physical and chemical surface modification technologies have been developed, which can effectively improve the wear resistance of titanium and its alloys, almost all of these methods reduce their fatigue strength.

[0003] Shot peening and rolling are recognized methods to improve the fatigue degree of titanium and its alloys. There have been a lot of researches, but the strengthening effect is not obvious.

In comparison, the effect of shot peening is relatively good, and it only increases the fatigue limit of industrial pure titanium by about 20%, which is far lower than the strengthening effect of shot peening on general materials.

The effect of rolling strengthening on improving the fatigue limit of industrial pure titanium is smaller, which is obviously lower than its strengthening effect on general materials.

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