Grain Boundary Precipitation in Fe-30Mn-9Al-5Cr-0.7C Alloy

Yi Hsuan Tuan; Chih Lung Lin; Chuen Guang Chao; Tzeng Feng Liu

doi:10.2320/matertrans.MRA2008060

This article has now been updated. Please use the final version.

Grain Boundary Precipitation in Fe-30Mn-9Al-5Cr-0.7C Alloy

Yi Hsuan Tuan, Chih Lung Lin, Chuen Guang Chao, Tzeng Feng Liu

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Keywords: transmission electron microscopy, carbides, ordering, austenitic iron aluminum manganese chromium carbon alloy

JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: MRA2008060

DOI https://doi.org/10.2320/matertrans.MRA2008060

The final version of this article is now available: Vol. 49 (2008) , No. 7 p.1589

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Abstract

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.

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