Phase-field simulation of tip splitting in dendritic growth of Fe-C alloy

Two types of dendrite tip splitting including dendrite orientation transition and twinned-like dendrites in Fe-C alloys were investigated by phase-field method. In equiaxed growth, the possible dendrite growth directions and the effect of supersaturation on tip splitting were discussed; the dendrite...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 24; no. 2; pp. 171 - 176
Main Authors Kang, Yong-sheng, Jin, Yu-chun, Zhao, Yu-hong, Hou, Hua, Chen, Li-wen
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.02.2017
Springer Singapore
Subjects
Applied and Technical Physics
Dendritic growth
Engineering
Fe-C alloy
Fe-C合金
Interfacial anisotropy
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
Tip splitting
分裂
各向异性参数
场模拟
枝晶尖端
枝晶生长
界面各向异性
过饱和度
Dendritic growth
Interfacial anisotropy
Tip splitting
Fe-C alloy
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ISSN1006-706X
2210-3988
DOI10.1016/S1006-706X(17)30024-9

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Summary:Two types of dendrite tip splitting including dendrite orientation transition and twinned-like dendrites in Fe-C alloys were investigated by phase-field method. In equiaxed growth, the possible dendrite growth directions and the effect of supersaturation on tip splitting were discussed; the dendrite orientation transition was observed, and it was found that the orientation regions of anisotropy parameters were reduced from three to two with increasing the supersaturation, which was due to the effect of interfacial anisotropy controlled by the solute in front of S/L interface changing with the increase of supersaturation. In directional solidification, it was found that the twinned-like dendrites were formed with the fixed anisotropy couples and no seaweed dendrites were observed; these were concluded from the results of competition between process anisotropy and inherent anisotropy. The formation process of twinned-like dendrite was investigated by tip splitting phenomenon, which was related to the changes of dendrite tips growth velocity. Then, the critical speed of tips splitting and solute concentration of twinned-like dendrites were investigated, and a new type of microsegregation in Fe-C alloys was proposed to supplement the dendrite growth theories.
Bibliography:11-3678/TF
Tip splitting Fe C alloy Interracial anisotropy Dendritic growth
Two types of dendrite tip splitting including dendrite orientation transition and twinned-like dendrites in Fe-C alloys were investigated by phase-field method. In equiaxed growth, the possible dendrite growth directions and the effect of supersaturation on tip splitting were discussed; the dendrite orientation transition was observed, and it was found that the orientation regions of anisotropy parameters were reduced from three to two with increasing the supersaturation, which was due to the effect of interracial anisotropy controlled by the solute in front of S/L interface changing with the increase of supersaturation. In directional solidification, it was found that the twinned like dendrites were formed with the fixed anisotropy couples and no seaweed dendrites were observed; these were concluded from the results of competition between process anisotropy and inherent anisotropy. The formation process of twinned-like dendrite was investigated by tip splitting phenomenon, which was related to the chan ges of dendrite tips growth velocity. Then, the critical speed of tips splitting and solute concentration of twinned-like dendrites were investigated, and a new type of microsegregation in Fe-C alloys was proposed to supplement the dendrite growth theories.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30024-9