Abstract
To clarify the effect of surface conditions for fatigue strength of super duplex stainless steel, plane bending fatigue tests were conducted with four types of surface conditions; emery polished, machined, shot blasted and grinded surface. Furthermore, surface residual stress, hardness and roughness were measured. As the result, fatigue limits were varied by surface conditions and it was considered to be affected by not only surface roughness but also residual stress and work hardening. In this study, √<area> parameter model with a-phase stress gave a good prediction for fatigue limit of super duplex stainless steel.
