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Zhang L.,Jiangsu University | Luo K.,Jiangsu University | Luo K.,V zenith Laser Technology Company | Lu J.,Jiangsu University | And 3 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2013

Effects of laser shock processing (LSP) on cavitation erosion behaviors of ANSI 304 stainless steel thick sheets treated by laser welding are investigated. Mechanical properties and microstructure of laser weldments are measured and observed by X-ray diffraction (XRD), microhardness, electronic balance and scanning electron microscope (SEM) tests in order to investigate cavitation erosion resistance of laser weldments. Results show that with the increment of LSP pulse energies after cavitation erosion, the martensite intensity is improved relatively and the removal of martensite is restrained, the hardness increases, and the cumulative mass loss and damaged surface areas of laser weldments decrease. Meanwhile, the martensite grains are fined, and undulations and upheavals become shallower and sparser, and the growth and propagation of the cracks on the surface are restrained. Thus, cavitation erosion resistance of laser weldments is enhanced. In addition, cavitation erosion resistance of laser welding zone (LWZ) is better than that of heat-affected zone (HAZ). Source


Huang S.,Jiangsu University | Huang S.,V zenith Laser Technology Company | Zhou J.Z.,Jiangsu University | Sheng J.,Jiangsu University | And 9 more authors.
International Journal of Fatigue | Year: 2013

The effects of coverage area on fatigue crack growth (FCG) properties of 6061-T6 aluminum alloy subject to multiple laser peening (LP) impacts were investigated. Residual stress, micro-structure and fatigue striation pattern on fracture cross-sections were analyzed. Compressive residual stresses and dense dislocation arrangements can be found in the superficial layer after LP. LP coverage area has a direct influence on FCG properties as verified by different size of shell ridges and fatigue striation spacing on fracture cross-sections. Meanwhile, FCG rate decreases with the increase of compressive residual stresses distribution perpendicular to the crack growth direction in the initial FCG stage. © 2012 Elsevier Ltd. All rights reserved. Source


Huang S.,Jiangsu University | Huang S.,V zenith Laser Technology Company | Zhou J.Z.,Jiangsu University | Sheng J.,Jiangsu University | And 7 more authors.
Engineering Fracture Mechanics | Year: 2013

Effects of laser energy on fatigue crack growth (FCG) properties of 6061-T6 aluminum alloy subjected to multiple laser peening (LP) were investigated. LP experiments and typical FCG experiments were performed on the compact tension (CT) samples. In order to reveal the enhancement mechanism of laser energy on FCG properties through residual stress (RS), a numerical model of effective stress intensity factor (SIF) was established. The results showed that compressive RS induced by LP can effectively decrease FCG rate and increase FCG lives of CT samples. The experimental results and numerical analysis correlated with each other. © 2013 Elsevier Ltd. Source

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