INVESTIGADORES
BOLMARO Raul Eduardo
artículos
Título:
Effects of laser shock processing and shot peening on 253 MA austenitic stainless steel and their consequences on fatigue properties
Autor/es:
L. SPADARO; HEREÑÚ, S.; RENATA STRUBBIA; G. GOMEZ ROSAS; BOLMARO, R.E.; C. RUBIO-GONZALEZ
Revista:
OPTICS AND LASER TECHNOLOGY
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2020 vol. 122
ISSN:
0030-3992
Resumen:
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 treatmentswere performed with 2500 pulse/cm2 and 5000 pulse/cm2. To evaluate the effects of each treatment, residualstress, roughness, hardness, and microstructure were analyzed. It is of particular interest the correlation of thefatigue performance with the dislocation microstructure evolution. The results reveal that all the surfacetreatments increase the surface hardness, induce compressive residual stresses (CRS) and a high density ofmechanical twins and dislocations. The stability of the workhardened near surface microstructure results in theimprovement of the fatigue life of peened 253 MA. Moreover, the best improvement of fatigue life reached for SPis mainly due to the highest number of twins and the more superficial CRS.
