Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys

被引:24
作者
Han, Chu [1 ]
Jiang, Ping [1 ]
Geng, Shaoning [1 ]
Gao, Song [1 ]
Mi, Gaoyang [2 ]
Wang, Chunming [2 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Mech Sci & Engn, State Key Lab Digital Mfg Equipment & Technol, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Grain coalescence; Solidification cracking susceptibility; Welding; Al-Cu alloys; Multiphase-field model; PHASE-FIELD; DIRECTIONAL SOLIDIFICATION; SINGLE-CRYSTAL; ALUMINUM-ALLOYS; BACK-DIFFUSION; HOT CRACKING; SUPERALLOY; GROWTH; ANISOTROPY; ENERGY;
D O I
10.1016/j.matdes.2021.110146
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Solidification cracking (SC) is highly related to the grain coalescence behavior during welding of aluminum alloys. In this study, the grain coalescence behavior and its effects on solidification cracking susceptibility (SCS) were investigated using the multiphase-field approach. Why SCS is high at a certain value of Cu concentration and why SC often occurs at high misorientation angles are revealed. Firstly, nominal compositions of Cu affect the morphology of microstructure during solidification. The crystals morphology is cellular at the low concentration, while the crystals are dendritic at the high concentration in the columnar grain region. The SCS of cellular grains is higher than dendrites due to the high volume fraction of solid when the grains/subgrains bridge. Under the action of tensile stress, the scarce residual liquid phase cannot backfill in time. Secondly, high misorientation angles make grain boundary energy in the solid-solid interface (sigma(ss)) is high. It is found that sigma(ss) suppresses the grain coalescence and increases the SCS of alloys. This leads the emergence of SC at high misorientation angles during welding. In this study, the coalescence behavior of grains during solidification is visually presented by simulation and the coherency point at the last-stage solidification is achieved accurately. (C) 2021 The Author(s). Published by Elsevier Ltd.
引用
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页数:12
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