Macro-micro numerical simulation and experimental study of Mg-Gd-Y-Zn-Zr alloy fabricated by cold metal transfer wire arc additive manufacturing

• DOI: 10.1016/j.jmrt.2022.12.193
• Publication Date: 2023-01-03T17:04:49Z
• Authors: Jianbin Wang; Zhanyong Zhao; Wenbo Du; Peikang Bai; Liqing Wang; Zhen Zhang; Zhiquan Huang
• Keywords: Equiaxed crystals; Dendrite (mathematics); Liquidus

The Mg-Gd-Y-Zn-Zr alloy components were fabricated by cold metal transfer (CMT) based wire arc additive manufacturing (WAAM). heat and equiaxed grain growth in the weld pool bonding zone of investigated through macro-micro numerical simulation. results shows, morphology molten area is ellipsoid with a major semi-axis 13 mm semi-minor axis 6 mm. size increases increasing temperature. With increase number layers material added, high temperature enlarged continuously. This due to weakening dissipation substrate preheating effect first added on subsequent added. phase field model during solidification process CMT welding pool, was established. crystals region gradients 4.9 °C/m 3.6 °C/m, propulsion velocity 1.5 m/min 2.3 simulated, respectively. further away from keyhole center, smaller gradient, faster dendrite speed, more vigorous morphology. unique layered processing method Marangoni melting CMT-WAAM promote β-Mg24(Gd,Y)5 RE-rich phases body-centered cubic structure. These precipitated are evenly distributed at boundaries, it hinders migration boundarie st, which turn inhibits growth.