Strengthening method for optimal combination of laser shock peening and shot peening

Abstract

The invention relates to the technical field of manufacturing equipment, and discloses a strengthening method for optimal combination of laser shock peening and shot peening. The method comprises thesteps of S1: designing a high-cycle fatigue titanium alloy test piece; S2: carrying out laser shock peening to the titanium alloy test piece; S3: carrying out shot peening to the titanium alloy test piece; S4: carrying out integrity test to the surface of the titanium alloy; S5: carrying out high-cycle fatigue test to the titanium alloy; and S6: carrying out parameter optimization. The strengthening method has good innovation and combines the advantages of two surface technologies of laser shock peening and shot peening; the process is simple, the laser shock peening technology and the shot peening technology are mature technologies; a titanium alloy component can be strengthened through controlling the strengthening parameters reasonably; the operation is simple, the feasibility is high,and the strengthening effect is good; through the high-cycle fatigue test, the results show that the combination strengthening can significantly improve the high-cycle fatigue life and fatigue limit of the titanium alloy component and has the advantages of good application prospect, etc.

Description

technical field [0001] The invention relates to the technical field of manufacturing equipment, in particular to a strengthening method of an optimized combination of laser shock strengthening and shot peening strengthening. Background technique [0002] Titanium alloy has high specific strength, good corrosion resistance and thermal stability, and is widely used in the aerospace field. Fatigue is one of the main causes of failure of titanium alloy materials during service, and fatigue cracks often initiate on the surface, so the surface state has an important impact on the fatigue life. Surface modification of titanium alloy parts can effectively improve its high cycle fatigue strength and prolong its fatigue life. [0003] Laser Shock Peening (LSP for short) and Shot Peening (Shot Peening for SP) are two widely used surface modification technologies, each with its own advantages. The basic principle of laser shock strengthening is to use the mechanical effect of short pu...

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Problems solved by technology

The depth of residual stress field produced by laser shock strengthening is large, which can reach more than 0.9mm, while the depth of residual stress field produced by shot peening is small, generally not more than 0.3mm. The stress relaxation under cyclic loading is more obvious, and the improvement of fatigue life is not as good as that of laser shock strengthening

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