TY - GEN
T1 - Simulation of columnar-to-equiaxed transition considering dendrite fragmentation during solidification of steel
AU - Morita, S.
AU - Miki, Y.
AU - Aramaki, N.
AU - Kikuchi, N.
N1 - Publisher Copyright:
© 2018 by AIST.
PY - 2018
Y1 - 2018
N2 - Columnar-to-equiaxed transition was simulated with the cellular automaton method considering fragmentation of dendrite arm, and evaluated by comparing with 50kg-scale ingot casting experiments. The obtained results are summarized as follows. (1) Dendrite fragmentation was introduced indirectly in the cellular automaton method to improve prediction accuracy. (2) In this calculation, the simulated results of the equiaxed grain ratio increased with lower Vcrit, which is the velocity threshold of fragmentation, whereas the formation of equiaxed grains was more difficult with higher Vcrit. (3) The simulated result with Vcrit Ӎ 400 μm reproduced the observed microstructure qualitatively. (4) In this work, the tuned parameter Vcrit is higher than the diffusion length per 1 s. It was implied that Vcrit represents the velocity for fragmentation due to local solute concentration.
AB - Columnar-to-equiaxed transition was simulated with the cellular automaton method considering fragmentation of dendrite arm, and evaluated by comparing with 50kg-scale ingot casting experiments. The obtained results are summarized as follows. (1) Dendrite fragmentation was introduced indirectly in the cellular automaton method to improve prediction accuracy. (2) In this calculation, the simulated results of the equiaxed grain ratio increased with lower Vcrit, which is the velocity threshold of fragmentation, whereas the formation of equiaxed grains was more difficult with higher Vcrit. (3) The simulated result with Vcrit Ӎ 400 μm reproduced the observed microstructure qualitatively. (4) In this work, the tuned parameter Vcrit is higher than the diffusion length per 1 s. It was implied that Vcrit represents the velocity for fragmentation due to local solute concentration.
KW - Equiaxed grain
KW - Fragmentation
KW - Microstructure simulation
KW - Solidification
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M3 - Conference contribution
AN - SCOPUS:85062513320
T3 - AISTech - Iron and Steel Technology Conference Proceedings
SP - 2671
EP - 2677
BT - AISTech 2018 Proceedings - Iron and Steel Technology Conference and Exposition
PB - Association for Iron and Steel Technology, AISTECH
T2 - AISTech 2018 Iron and Steel Technology Conference and Exposition
Y2 - 7 May 2018 through 10 May 2018
ER -