A Method Based on Semi-Solid Forming for Eliminating Coarse Dendrites and Shrinkage Porosity of H13 Tool Steel

Abstract

A method called forging solidifying metal (FSM), which is applied for eliminating coarse dendrites and shrinkage porosity defects of ferrous alloys was proposed based on semi-solid forming technology (SSF). To verify its feasibility, the effects of liquid fraction (F L) on the microstructure of the deformed H13 steel were investigated experimentally. The coarse dendrites structure still existed and cracks appeared when the 0.1/s 50% FSM method was carried out at~20% F L. What is significantly different from that is, the elimination of the coarse dendrites structure and shrinkage porosity defects became more significant, when this method was conducted at the end of solidification (F L < 10%). The microstructure of H13 steel was significantly refined and also became dense in such condition.

Numerical Simulation of Macrosegregation with Solid Deformation During the Solidification of Steel Ingots Using a Single-Phase/Two-Phase Integrated Model

“…During recent years, a method called forging solidifying metal (FSM) has been developed to establish an energy-efficient process chain for ferrous alloy [18,19]. The FSM method, based on semi-solid forming (SSF) technology, consists of deforming the ingot with the mushy core when the solid shell has formed during solidification.…”