Multi-phase-field simulation of austenite peritectic solidification based on a ferrite grain

• 作 者: Chao Yang Jing Wang Junsheng Wang Yu Liu Guomin Han Haifeng Song Houbing Huang
• 机 构: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
• 出 处: 中国物理B（英文版）
• 发表日期: 2021年1期
• 关键词: multi-phase-field simulation morphology evolution peritectic solidification carb

A multi-phase-field model is implemented to investigate the peritectic solidification of Fe-C alloy. The nucleation mode of austenite is based on the local driving force, and two different thicknesses of the primary austenite on the surface of the ferrite equiaxed crystal grain are used as the initial conditions. The simulation shows the multiple interactions of ferrite, austenite, and liquid phases, and the effects of carbon diffusion, which presents the non-equilibrium dynamic process during Fe-C peritectic solidification at the mesoscopic scale. This work not only reveals the influence of the austenite nucleation position, but also clarifies the formation mechanism of liquid phase channels and molten pools. Therefore, the present study contributes to the understanding of the micro-morphology and micro-segregation evolution mechanisms of Fe-C alloy during peritectic solidification.