Topic
Peening
About: Peening is a research topic. Over the lifetime, 5538 publications have been published within this topic receiving 73073 citations.
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TL;DR: In this paper, a comparative study of the influence of laser shock peening without coating (LSPwC) and shot peening (SP) treatments on the low cycle fatigue life of 253 MA austenitic stainless steel was investigated.
Abstract: A comparative study of the influence of laser shock peening without coating (LSPwC) and shot peening (SP) treatments on the low cycle fatigue life of 253 MA austenitic stainless steel was investigated. LSPwC treatments were performed with 2500 pulse/cm2 and 5000 pulse/cm2. To evaluate the effects of each treatment, residual stress, roughness, hardness, and microstructure were analyzed. It is of particular interest the correlation of the fatigue performance with the dislocation microstructure evolution. The results reveal that all the surface treatments increase the surface hardness, induce compressive residual stresses (CRS) and a high density of mechanical twins and dislocations. The stability of the workhardened near surface microstructure results in the improvement of the fatigue life of peened 253 MA. Moreover, the best improvement of fatigue life reached for SP is mainly due to the highest number of twins and the more superficial CRS.
30 citations
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TL;DR: In this paper, ultrasonic peening treatment (UPT) in three directions is proposed to refine the large columnar prior-β grains and secondary α grains, and to improve anisotropic in tensile properties.
30 citations
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TL;DR: In this article, a nanocrystallized surface layer of around 150µm thickness was created on AISI 304L by nano-scale surface peening, which is more sensitive to tribocorrosion under intermittent sliding than continuous one due to depassivation/repassivation phenomena.
29 citations
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TL;DR: In this article, the effect of surface roughness, surface and sub-interface residual stresses, nature of crack propagation and its deflection on the resulting fatigue life was analyzed using conventional and micro X-ray diffraction (XRD) techniques.
29 citations
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TL;DR: In this paper, the full width at half maximum (FWHM) of the X-ray diffraction profile from the peened surface was decreased, although compressive residual stress was introduced, and the results demonstrate that the micro-strain is relieved by CSP without the need for heat treatment, and is therefore a sort of annealing.
29 citations