Prediction of Residual Liquid Distribution of Austenitic Stainless Steel during Laser Beam Welding Using Multi-Phase Field Modeling

摘要

The aim of this research was to predict the residual liquid distribution during laser beam welding at different welding speeds using Multi-phase field modeling to investigate the solidification cracking phenomenon. The calculated secondary dendrite arm spacing and primary dendrite tip radius were compared with experimental values and Kurz-Giovanola-Trivedi modeling. The effect of calculation parameters, such as interfacial mobility and anisotropy of interfacial mobility, on lengths of the residual liquid distribution composed of residual liquid connecting with the molten pool (L_P) and film-dot (L_(FD)) regions was evaluated quantitatively. The length of each region increased with increasing interfacial mobility. The lengths of L_P and L_(FD) increased and decreased, respectively, with increasing anisotropy of interfacial mobility and finally both remained constant. An adjustment of the calculation parameters using experimental results yielded the lengths of the residual liquid distribution that were nearly the same as that of the fracture surface of a solidification crack. The residual liquid distribution could be predicted from verification with experimental results and calculated parameter optimization at a high cooling rate.