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Dendrite fragmentation induced by massive-like ?-? transformation in Fe-C alloys.


ABSTRACT: Dendrite arm fragmentation is considered in solidification structure tailoring. Time-resolved and in situ imaging using synchrotron radiation X-rays allows the observation of dendrite arm fragmentation in Fe-C alloys. Here we report a dendrite arm fragmentation mechanism. A massive-like transformation from ferrite to austenite rather than the peritectic reaction occurs during or after ferrite solidification. The transformation produces refined austenite grains and ferrite-austenite boundaries in dendrite arms. The austenite grains are fragmented by the liquid phase that is produced at the grain boundary. In unidirectional solidification, a slight increase in temperature moves the ferrite-austenite interface backwards and promotes detachment of the primary and secondary arms at the ?-? interface via a reverse peritectic reaction. The results show a massive-like transformation inducing the dendrite arm fragmentation has a role in formation of the solidification structure and the austenite grain structures in the Fe-C alloys.

SUBMITTER: Yasuda H 

PROVIDER: S-EPMC6639379 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Dendrite fragmentation induced by massive-like δ-γ transformation in Fe-C alloys.

Yasuda Hideyuki H   Morishita Kohei K   Nakatsuka Noriaki N   Nishimura Tomohiro T   Yoshiya Masato M   Sugiyama Akira A   Uesugi Kentaro K   Takeuchi Akihisa A  

Nature communications 20190718 1


Dendrite arm fragmentation is considered in solidification structure tailoring. Time-resolved and in situ imaging using synchrotron radiation X-rays allows the observation of dendrite arm fragmentation in Fe-C alloys. Here we report a dendrite arm fragmentation mechanism. A massive-like transformation from ferrite to austenite rather than the peritectic reaction occurs during or after ferrite solidification. The transformation produces refined austenite grains and ferrite-austenite boundaries in  ...[more]

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