Effects of laser shock processing on mechanical properties of Fe–Ni alloy

• DOI: 10.1016/j.matdes.2009.02.015
• Publication Date: 2009-02-25T10:35:12Z
• Authors: J.Z. Lu; L. Zhang; A.X. Feng; Y.F. Jiang; G.G. Cheng
• Keywords: 0203 mechanical engineering; 02 engineering and technology

Abstract The effects of laser shock processing (LSP) on nano-hardness, elastic modulus and surface residual stress of Fe–Ni alloy were investigated. The values of nano-hardness, elastic modulus of the Fe–Ni alloy after LSP were measured by the nano-indentation technology, and the surface residual stress was determined by XRD with sin 2 ψ method, and scanning electron microscopy (SEM) observations of the microstructure before and after LSP were carried out. Experimental results showed that the values of the nano-hardness, elastic modulus and surface residual stress in the laser-shocked region and the laser-affected region were obviously improved compared to those in the non-shocked region. The mechanisms underlying the improved nano-hardness, elastic modulus and surface residual stress were also addressed.