The temperature dependence of the residual strength and ductility of a type-316 LN austenitic stainless-steel after prior cold work by tension and swaging

Abstract

The influence of temperature and prior cold work on the residual tensile strength and ductility of a type-316 LN austenitic stainless-steel has been studied in the temperature range 300–1123 K after prior deformation at room temperature by tension and swaging. In general, it was observed that the effect of prior cold work by different modes of deformation on the mechanical response of the material has a qualitatively common trend of increasing the strength and reducing the ductility. A structure-sensitivity parameter (the ratio of the yield strength of the prior cold-worked material to that of the as-received material at a given temperature) is proposed and found to increase with temperature and the degree of prior cold work. The additional strengthening of the structure in the temperature range up to 823 K is considered to arise due to dislocation interaction with solutes or precipitates. The decrease of the structure-sensitivity parameter above 823 K is attributed to dynamic recovery processes and/or the absence of dislocation solute interaction.