Effect of laser shock processing on fatigue life of 2205 duplex stainless steel notched specimens

CÉSAR A. VÁZQUEZ JIMÉNEZ, ; VIGNAUD GRANADOS ALEJO; GILBERTO GÓMEZ ROSAS; SILVINA HEREÑÚ; CARLOS RUBIO GONZÁLEZ

OPTICS AND LASER TECHNOLOGY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2017 vol. 97 p. 308 - 315

0030-3992

The effect laser shock processing (LSP) on high cycle fatigue behavior of 2205 duplex stainless steel (DSS) notched samples was investigated. The swept direction parallel (LSP 1) and perpendicular (LSP 2) to rolling were used in order to examine the sensitivity of LSP to manufacturing process since this steel present significantly anisotropy. The Nd:YAG pulsed laser operating at 10 Hz frequency and 1064 nm wavelength was utilized. The LSP configuration was the water jet mode without protective coating. Notched specimens 4 mm thick were treated on both sides, and then fatigue loading was applied with R = 0.1. Theresults showed that the LSP 2 condition induces higher compressive residual stresses as well as a higher fatigue life than the LSP 1 condition. By applying LSP 2 condition, an enhancement of fatigue life up to 402% is reported. In addition, the microhardness profiles showed different depths of hardening layerfor each direction, according to the anisotropy observed.