The simulation of the preparation of the ingot with liquid core

Abstract

During the preparation of the ingot with liquid core in the early stage, the nite element models of the solidi cation 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 the nite element simulation results, we obtained the in uence 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 high carbon, the medium manganese and the high chromium contents were bene cial to form the liquid core.Based on the method of the solidi cation time, the algorithm was programmed by the python language. We analyzed the in uence of the three elements C, Mn, and Cr on the concentration distribution based on the temperature eld data, which were obtained by DEFORM-2D after the solidi cation and the ultra-high temperature demoulding. According to the simulation results, we found that the region prone to negative segregation.