DISLOCATION STRUCTURE AND NON‐PROPORTIONAL HARDENING OF TYPE 304 STAINLESS STEEL

Abstract

Abstract— This paper describes the microstructure of Type 304 stainless steel after cyclic loading at room temperature under tension‐torsion non‐proportional strain paths. The degree of cyclic non‐proportional hardening is correlated with changes in the dislocation substructure. Dislocation cells, dislocation bundles, twins and stacking faults are all observed. The type of microstructure formed and resultant stress response is dependent on the degree of non‐proportional loading and strain range. Cyclic stress range was uniquely correlated with mean cell size.