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Microstructural observations of prior-austenite grain boundary cementite in tempered martensite of an Fe-2%Mn-0.36%C alloy were performed. Grain boundary cementite could be markedly refined by applying ausforming. Unlike the case of the non-ausformed specimen, no coarse cementite films were observed and fine cementite particles with various variants tended to form at a serrated prior-austenite grain...
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