INFLUENCE OF STRUCTURAL MODIFICATION ON WORK-HARDENING BEHAVIOR OF TYPE-316 STAINLESS-STEEL

Work-hardening behaviour of type 316 austenitic stainless steel having different initial dislocation structures introduced by swaging to var ious levels is analysed by a simplified Kock's model which takes into account the structural changes through the dislocation accumulation an d annihilation process during deformation. The dislocation accumulatio n and annihilation factors show a temperature and structure dependence . The dislocation annihilation factor shows a plateau or decreasing te ndency in the dynamic strain ageing (DSA) temperature range. This is a ttributed as either due to dislocation accumulation being more pronoun ced than dislocation annihilation or as due to precipitates being form ed at DSA temperatures acting as obstacles to dislocation motion in th e DSA temperature range.