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王常帅.一种Ni-Fe-Cr基合金的凝固特征和偏析行为研究[J].稀有金属材料与工程(英文),2018,47(12):3816~3823.[王常帅.Solidification Characteristics and Segregation Behavior of a Ni-Fe-Cr based Alloy[J].Rare Metal Materials and Engineering,2018,47(12):3816~3823.]
Solidification Characteristics and Segregation Behavior of a Ni-Fe-Cr based Alloy
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Received:April 09, 2017  Revised:July 04, 2017
Key words: Ni-Fe-Cr based alloy  Solidification microstructure  Solidification path  Solution distribution coefficient  Dendritic segregation
Foundation item:国家自然科学基金项目(青年基金)
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      Solidification characteristics and segregation behavior of a Ni-Fe-Cr based alloy with planar interface and dendritic growth, which was obtained through quenching experiments during directional solidification, were investigated in this paper. The major precipitates are γ, γ′ and MC. The phase transition route is determined as follows: L→L+γ→L+γ+MC→γ+γˊ+MC. The solution distribution coefficients of Ti, Nb and Mo are less than unity. The solution distribution coefficients of Fe is greater than unity and, Al and Cr are close to 1. The solute boundary layer forms ahead of the liquid/solid interface when the steady-state growth begins. The solute is carried away mainly by diffusion in the solute boundary layer, but carried away mainly by flow out of the solute boundary layer. The solute distribution in solid phase with dendritic growth is similar to that with planar interface growth. However, the solute concentration in the quenched liquid in the interdendritic area is obviously higher than that ahead of the liquid/solid interface. The solidification segregation of the mushy zone is more serious than that of the solid region. It indicates that the back-diffusion in solid phase and the precipitation of MC carbide would reduce the solidification segregation during the dendritic growth.