Atypical transitions in material response during constant strain rate, hot deformation of austenitic steel

• DOI: 10.1063/1.5008184
• Publication Date: 2017-10-17T00:30:44Z
• Authors: Utpal Borah; Aashranth B.; Dipti Samantaray; Santosh Kumar; M. Arvinth Davinci; Shaju K. Albert; A. K. Bhaduri
• Keywords: 0103 physical sciences; 01 natural sciences

Work hardening, dynamic recovery and dynamic recrystallization (DRX) occurring during hot working of austenitic steel have been extensively studied. Various empirical models describe the nature and effects of these phenomena in a typical framework. However, the typical model is sometimes violated following atypical transitions in deformation mechanisms of the material. To ascertain the nature of these atypical transitions, researchers have intentionally introduced discontinuities in the deformation process, such as interrupting the deformation as in multi-step rolling and abruptly changing the rate of deformation.In this work, we demonstrate that atypical transitions are possible even in conventional single-step, constant strain rate deformation of austenitic steel. Towards this aim, isothermal, constant true strain rate deformation of austenitic steel has been carried out in a temperature range of 1173–1473 K and strain rate range of 0.01–100 s−1. The microstructural response corresponding to each deform...