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3D PREDICTION OF MICROSTRUCTURE FORMATION DURING SOLIDIFICATION OF Mg-RE ALLOY PROCESSED BY LASER SURFACE REMELTING
Wang, Shaofan1; Liu, Dong-Rong1; Wang, Lei1; Chen, Tian2
2023-08-03
摘要Microstructure formation is predicted during solidification of Mg-4Y-3Nd-0.5Zr (wt.%) alloy processed by laser surface remelting (LSR). A three-dimensional (3D) multiscale model is developed, which couples a thermalfluid model to describe the molten-pool dynamics at macroscale with a sharp interface model to describe nucleation and dendrite growth at micro-scale. A derived formula of interfacial weighted mean curvature incorporated with surface energy anisotropy realizes the simulation of eighteen-branch alpha-Mg dendrite growth. Microsegregation of Y, Nd and Zr elements is simulated through a solutal equilibrium approach. The simulated results show that the alpha- Mg matrix is depletion of Y and Nd elements and enrichment of Zr. Rapid solidification in LSR induces the alpha-Mg phase to solidify as an equiaxed structure without apparent dendritic branching. Under a fast cooling condition, the cooling- rate-induced thermal undercooling dominates the heterogeneous nucleation. Continuous nucleation manner is favored, with many nuclei activated. The simulated molten-pool depth, microstructure, and segregation pattern are shown to be in qualitative agreement with experimental results. The developed 3D multiscale model can contribute to a comprehensive prediction of microstructure and microsegregation formations of Mg-RE alloys during LSR and help optimize the actual LSR process.
关键词microstructure formation Mg-RE alloy multiscale simulation solidification laser surface remelting
DOI10.1007/s40962-023-01124-4
发表期刊INTERNATIONAL JOURNAL OF METALCASTING
ISSN1939-5981
页码19
通讯作者Liu, Dong-Rong(dongrongliu@hrbust.edu.cn) ; Chen, Tian(tianchen@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001041173300001
语种英语