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Criterion for Dendrite Fragmentation of Carbon Steel under Imposition of Linear Travelling EMS
Author(s) -
Su ZhiJian,
Chen Jin,
Nakajima Keiji,
He JiCheng
Publication year - 2009
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.2374/sri09sp014
Subject(s) - dendrite (mathematics) , fragmentation (computing) , materials science , volume fraction , equiaxed crystals , mechanics , composite material , metallurgy , geometry , mathematics , microstructure , physics , computer science , operating system
In this study the columnar‐to‐equiaxed transition (CET) of carbon steel with 0.22‐0.98 mass%C is investigated, based on the dendrite fragmentation theory of T. Campanella et al. The following conclusions are obtained: The criterion for dendrite fragmentation under linear EMS is obtained and verified by the 0.22‐0.98 mass%C steel experiments. Investigation is carried out on the relation between the superficial velocity of the liquid phase and the actual velocity of the interdendritic liquid and the volume fraction of solid at the time of dendrite fragmentation (CET occurrence). At the same superficial velocity, the dendrite fragmentation critical volume fraction of solid is smaller in the case of high carbon steel. As a result, the CET occurrence is more difficult in the case of high carbon steel. Dendrite fragmentation induced by EMS is confirmed by the fragments of dendrite arms observed in the macrostructure. The length of dendrite fragmentation observed is about 1mm.