鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
相変態・材料組織
共析鋼における擬似パーライト組織の三次元構造および生成機構の解析
中村 祐太Zhi-Lei Wang小川 登志男足立 吉隆
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2020 年 106 巻 10 号 p. 751-756

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We investigated the three-dimensional morphology and crystallographic characteristics of cementite in degenerate pearlite in eutectoid steel using FIB-SEM. The three-dimensional morphology of cementite in degenerate pearlite was rod-like and/or incomplete plate-like structures. Combining the three-dimensional image with EBSD measurement data revealed that cementite grows in the low index direction. In addition, we also investigated the relationship between the pearlite morphology and the deviation angle from K-S orientation relationship (K-S OR) between austenite and pearlite during phase transformation. The deviation angle from the K-S OR with austenite in the pearlite growth direction side affected the microstructural evolution. Coarse degenerate pearlite was formed when the deviation angle from K-S OR is small, and fine degenerate pearlite and lamella pearlite tended to be formed as the deviation angle increases. From these results, we concluded that the pearlite morphology including degenerate pearlite can be classified by the deviation from K-S OR with austenite.

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