IMR KINKEN Research Highlights　2022

概要

Ferrite transformation behavior during isothermal holding was studied in the ferrite (α) + austenite (γ) two-phase region of Fe-0.3mass%N binary alloy. Two morphologies of Allotoriomorphic ferrite (AF) and Widmanstetten ferrite (WF) formed from the prior γ grain boundary. The retained γ was obtained by decreasing the transformation temperature in the two-phase region, and a maximum volume fraction of 9% was obtained by holding at 600 °C. AF had a near Kurdjumov-Sachs orientation relationship (K-S OR) with one side of the adjacent γ grains and grew into the γ grains without K-S OR. On the other hand, WF had a near K-S OR with the matrix.

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