EBSD Investigation to Study the Restoration Mechanism and Substructural Characteristics of 23Cr–6Ni–3Mo Duplex Stainless Steel During Post-deformation Annealing (original) (raw)

Transactions of the Indian Institute of Metals

Abstract

In the present study, microstructural analysis of post-deformation annealed sample has been carried out for 23Cr–6Ni–3Mo duplex stainless steel. It was observed that the restoration mechanism and substructural characteristics were different for austenite and ferrite during post-deformation annealing. In the initial stage of post-deformation annealing, the restoration mechanism of austenite envisaged meta-dynamic recrystallization (MDRX), while the dominating mechanism of softer ferrite showed static recovery (SRV) with a minimal of static recrystallization (SRX). In the intermediate stage, the austenite showed SRX followed by coarsening of meta-dynamically recrystallized grains, and ferrite revealed mostly SRV. The last stage of post-deformation annealing showed the disintegration of substructures in both austenite and ferrite. The microstructure after 20 min of post-deformation annealing displayed coarse subgrains. Finer austenite subgrains were observed as compared to ferrite subgrains after the post-deformation annealing of 20 min. High-resolution EBSD was used to study substructural characteristics of microstructure, and post-processing of microstructural results was made by HKL Channel 5 software. Misorientation angle distribution, subgrain size as well as restoration mechanism corresponding to both austenite and ferrite were determined over intensive sample area.

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