Role of dynamic strain aging in the tensile property, cyclic deformation and fatigue behavior of Z2CND18.12N stainless steel between 293K and 723K

摘要: Abstract Tensile properties and cyclic stress–strain response of Z2CND18.12N austenitic stainless steel were investigated at the strain rate 1×10 −3 /s in temperature range between 293 K 723 K. Low cycle fatigue tests also carried out 6×10 623 K. SEM TEM analyses performed on specimens. strength ductility found to reduce drastically with increasing from 423 K but almost remained same level 523 K Serrations occurred during stress approaching ultimate tensile 623 K The responses temperatures ranging characterized by a rapid initial hardening maximum stress, followed gradual softening, whereas 723 K continuous was present. ratio, defined as peak divided increased present range. Phenomenological friction back stresses derived an analysis hysteresis loop shapes using Cottrell scheme. results indicated that increase mainly responsible for hardening. Fatigue life decreased amplitude both Transgranular fracture failure mode observed temperatures. observations revealed dislocation structure changed cellular planar slip band Dynamic aging has been believed play significant role properties, deformation behavior material.