Modelling and simulation of equilibrium and non-equilibrium solidification in laser spot welding

International Conference on Advances in Materials and Manufacturing Applications 2017

Reddy, Pradeep^1 ; Patel, Virendra^1 ; Yadav, Anshul^1 ; Patel, Sushil^1 ; Kumar, Arvind^1

Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur

208016, India^1

关键词: Heterogeneous nucleation;    Modelling and simulations;    Non-equilibrium phase;    Non-equilibrium solidification;    Nucleation temperature;    Solid-liquid interfaces;    Solidification kinetics;    Solidification process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012092/pdf
DOI  :  10.1088/1757-899X/310/1/012092

来源: IOP

【 摘 要 】

In this work, rapid solidification in laser welding is studied by solving transient, coupled, governing equations of mass, momentum and energy conservation using a fixed-grid, finite volume methodology. The solidification process in laser welding occurs with high cooling rates involving rapid solidification kinetics. The non-equilibrium phase change is accounted at the solid-liquid interface of the weld pool and it is assumed that heterogeneous nucleation occurs instantaneously when the temperature in the melt pool reaches the nucleation temperature. Simulation results of laser welding with undercooling and without undercooling are compared. It is found that the melt pool width is larger in the case of undercooling case, however, the maximum temperature in the weld pool is higher in the case of without undercooling case.