2008 Volume 49 Issue 7 Pages 1589-1593
The as-quenched microstructure of the Fe-30%Mn-9%Al-5%Cr-0.7%C (in mass%) alloy was single-phase austenite. When the as-quenched alloy was aged at 550°C–750°C, fine (Fe,Mn)3AlC carbides were formed within the austenite matrix. In addition, as the aging temperature increased, a M7C3 carbide + D03→M7C3 carbide + B2→M7C3 carbide + α (ferrite) phase transition had occurred on the grain boundaries. This grain boundary precipitation behavior has never before been observed in FeMnAlC and FeMnAlCrC alloy systems.