高温浸炭によりFe-3%Si合金単結晶{110}表面に析出したドーナツ状のセメンタイト

概要

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High temperature carburization was done using the {110} surface of an Fe-3%Si single crystal. The carbide morphology of specimen surface was observed by the scanning and transmission electron microscopes. Doughnut-like cementite (Fe_3C) of 50-200 nm in carburizing temperatures of 1173∿1273K was formed on the {110} surface of an Fe3%Si single crystal, and they formed with the colonies of the fine particles of about 2-5 nm. The preferential formation of Fe_3C was quite different from the graphite formation that occured only under the high temperature carburization of past experiments. The orientation relationship between the Fe_3C and iron matrix is considered to be [002]_<Cementite//[011]_<Fe>. This relationship was consistent with that observed in the precipitation of Fe_3C during the tempering of steel by Nishida and Tanino. It is considered that the {110} surface of an Fe-3%Si single crystal under the high temperature carburization formed with characteristic morphology of doughnut-like Fe_3C, due to the preferential formation of the coherency for the crystallographic plane of (011)_<Fe> and (002)_<Cementite.
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