Hot Deformation Characteristic and Optimization of Processing Parameters for 0.1C–18Cr–1Al–1Si Ferritic Heat Resistant Stainless Steel

Abstract

The hot deformation behavior of 0.1C–18Cr–1Al–1Si ferritic heat resistant stainless steel has been investigated in the temperature range of 900–1100°C and the strain rate range of 0.01–1 s⁻¹ employing compressive tests. The obtained results have shown that the volume fraction and average size of the AlN phases and (Cr,Fe)₂₃C₆ carbides decrease with increasing strain rate. The deformation activation energy is calculated as 332.306 kJ·mol⁻¹. Based on the analysis of processing map and microstructure, the optimum processing domain for hot deformation is confirmed as the temperature range of 1045–1100°C and strain rate range of 0.06–1 s⁻¹.