Evolution of the surface integrity while turning a fillet radius in a martensitic stainless steel 15-5PH

摘要

Surface integrity induced by longitudinal turning has been widely investigated in the literature.On the contrary,few works have aimed at investigating the surface integrity induced during turning of geometric singularities such as fillet radii.This paper investigates the surface integrity generated while turning a fillet radius in a martensitic stainless steel(15-5PH).The induced residual stresses,microstructure and mechanical properties have been characterized.Then,a geometrical analysis has revealed that the chip removal mechanisms vary continuously along the fillet radius,which,as a consequence,modify the cutting phenomena responsible of surface integrity modifications along the fillet radius.The study has highlighted that the microstructure remained stable but the residual stresses profiles differed especially regarding the compression peak intensity and the affected depth.