浮力
同质性(统计学)
材料科学
包裹体(矿物)
体积分数
频道(广播)
冶金
氧化物
化学物理
纳米技术
机械
化学工程
复合材料
化学
矿物学
物理
计算机科学
工程类
机器学习
计算机网络
作者
Dianzhong Li,Xing-Qiu Chen,Peng Fu,Xiaoping Ma,Hongwei Liu,Yun Chen,Yingnan Cao,Yikun Luan,Yiyi Li
摘要
Channel segregation, which is featured by the strip-like shape with compositional variation in cast materials due to density contrast-induced flow during solidification, frequently causes the severe destruction of homogeneity and some fatal damage. An investigation of its mechanism sheds light on the understanding and control of the channel segregation formation in solidifying metals, such as steels. Until now, it still remains controversial what composes the density contrasts and, to what extent, how it affects channel segregation. Here we discover a new force of inclusion flotation that drives the occurrence of channel segregation. It originates from oxide-based inclusions (Al2O3/MnS) and their sufficient volume fraction-driven flotation becomes stronger than the traditionally recognized inter-dendritic thermosolutal buoyancy, inducing the destabilization of the mushy zone and dominating the formation of channels. This study uncovers the mystery of oxygen in steels, extends the classical macro-segregation theory and highlights a significant technological breakthrough to control macrosegregation.
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