The simulation of the preparation of the ingot with liquid core

During the preparation of the ingot with liquid core in the early stage, the finite element models of the solidification and the ultra-high temperature demoulding were established in DEFORM-3D. The thermophysical properties of ASSAB 718 with the variations of C, Mn, and Cr were calculated in JMatPro®. The material database was imported into DEFORM-3D. Through the analysis of finite element simulation results, we obtained the influence of three main elements C, Mn, and Cr contents on the size of the solid-phase region, the liquid-phase region, and the solid-liquid two-phase region in the ingot. We optimized the composition of the material to get a wide solid-liquid phase range. The medium/high carbon, the medium manganese, and the high chromium contents were beneficial to form the liquid core. Based on the method of the solidification time, the algorithm was programmed by the python language. We analyzed the influence of the three elements C, Mn, and Cr on the concentration distribution based on the temperature field data, which were obtained by DEFORM-2D after the solidification and the ultra-high temperature demoulding. According to the simulation results, we found the region prone to negative segregation.