Flow Behavior and Microstructural Evolution of an As-Wrought Duplex Stainless Steel during Hot Compression Deformation

Lei Chen; Xiao Cong Ma; Ming Jia Wang; Hua Gui Huang

doi:10.4028/www.scientific.net/AMR.699.808

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Flow Behavior and Microstructural Evolution of an As-Wrought Duplex Stainless Steel during Hot Compression Deformation

Abstract:

The flow behavior and microstructural evolution of an as-wrought duplex stainless steel has been investigated by Gleeble-3500 thermal-mechanical simulator within the temperature range of 950-1200°C and the strain rate range of 0.1-10s-1. The flow curves exhibited a peak stress characteristic followed by dynamic softening and the strain for appearance of steady stress is bigger at higher strain rate than at lower strain rate. The apparent activation energy (Q) and the apparent stress exponent (n) of the test steel are obtained to be about 462 kj/mol and 3.95, respectively. The relationship between peak stress (σp) and Zener-Holomon parameter (Z) is obtained, whereby the σp can be predicted at differern hot working conditons. The results of microstructural observation show that the austenite softens by the dynamic recrystallization (DRX) which can be dominantly responsib le for dynamic softening, while the ferrite phase mainly continues to exhibit dynamic recovery (DRV).