Phase transformation of steel nucleating from non-metallic compounds and its application to high-performance steel

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The primary objective of the study is to investigate the phase transformation behavior of steel starting from nonmetallic compounds dispersed in steel and to clarify the nucleation and growth mechanisms from the compound-steel interface. The compounds used in this study are B1-type compounds which have so-called Baker-Nutting (B-N) coherent orientation relationship with bcc ferrite. It was found that ferrite starting from the compounds kept the B-N orientation relationship with the compounds when the transformation proceeded by diffusional transformation mechanism with relatively small undercooling. On the other hand, when the transformation proceeded by diplacive ptransformation mechanism with larger undercooling, preferential nucleation and growth of ferrite was found when the ferrite has either the B-N or other low-index parallel orientation relationship together with the Kurdjumov-Sachs (K-S) orientation relationship with fcc austenite.