Phase-field-lattice Boltzmann simulation of dendrite growth under natural convection in multicomponent superalloy solidification

被引：11
作者：
Yang, Cong [1 ]
Xu, Qing-Yan [1 ]
Liu, Bai-Cheng [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat Proc Technol, Minist Educ, Beijing 100084, Peoples R China
来源：
RARE METALS | 2020年 / 39卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Dendrite growth; Natural convection; Phase-field model; Lattice Boltzmann method; SINGLE-CRYSTAL SUPERALLOY; DIRECTIONAL SOLIDIFICATION; MELT CONVECTION; MICROSTRUCTURE; ALLOYS; MACROSEGREGATION; EVOLUTION; SELECTION; MODEL;
D O I：
10.1007/s12598-019-01292-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The thermosolutal convection can alter segregation pattern, change dendrite morphology and even cause freckles formation in alloy solidification. In this work, the multiphase-field model was coupled with lattice Boltzmann method to simulate the dendrite growth under melt convection in superalloy solidification. In the isothermal solidification simulations, zero and normal gravitational accelerations were applied to investigate the effects of gravity on the dendrite morphology and the magnitude of melt flow. The solute distribution of each alloy component along with the dendrite tip velocity during solidification was obtained, and the natural convection has been confirmed to affect the microsegregation pattern and the dendrite growth velocity. In the directional solidification simulations, two typical temperature gradients were applied, and the dendrite morphology and fluid velocity in the mushy zone during solidification were analyzed. It is found that the freckles will form when the average fluid velocity in the mushy zone exceeds the withdraw velocity.
引用
收藏
页码：147 / 155
页数：9
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