Tensile flow and work hardening behaviour of type 316L(N) austenitic stainless steel in the framework of one-internal-variableand two-internal-variable approaches

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-06, Vol.636, p.269-278
• Main Authors: Choudhary, B.K., Christopher, J.
• Format: Article
• Language: English
• Subjects: Austenitic stainless steels; Dislocation density; Dominance; Dynamics; Flow behaviour; Heat resistant steels; Materials science; One-internal-variable approach; Plastic deformation; Signatures; Two-internal-variable approach; Type 316L(N) SS; Work hardening; Work hardening behaviour
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2015.03.107

Detailed investigation on tensile flow and work hardening behaviour of type 316L(N) austenitic stainless steel has been performed in the framework of one-internal-variable and two-internal-variable approaches over the temperatures ranging from 300 to 1023K. The one-internal-variable approach involving dislocation density as a micromechanical internal-state-variable failed to describe the transient flow and work hardening behaviour. At all the temperatures, the analysis based on the evolution of forest dislocation density and mean free path with plastic strain in the two-internal-variable approach described appropriately all the three stages, i.e., transient stage, stage-II and stage-III work hardening behaviour. The work hardening parameters associated with two-internal-variable approach also provide better insight into the deformation behaviour over one-internal-variable approach. The steel exhibited three distinct temperature regimes in the variations of work hardening parameters with temperature along with signatures of dynamic strain ageing at intermediate temperatures and the dominance of dynamic recovery at high temperatures.