Effects of laser shock processing and shot peening on 253 MA austenitic stainless steel and their consequences on fatigue properties
- Spadaro, Leticia
- Hereñu, Silvina Andrea Noemi
- Strubbia, Renata
- Gómez Rosas, Gilberto
- Bolmaro, Raul Eduardo
- Rubio González, Carlos
DOIAbstract
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 microstructur...
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