Fine equiaxed dendritic structure of a medium carbon steel cast using pulsed magneto-oscillation melt treatment

• 来源期刊: 先进制造进展（英文版）
• 关键词: Pulsed magneto-oscillation (PMO) Grain refinement Carbon steel Simulation Microstructure
• 年，卷（期）: 2018,（2）
• 页码范围: 189-194
• 页数: 6页
• 语种: 英文

摘要

The application of a pulsed magneto-oscillation (PMO) technique during the solidification of a commercial high melting point medium carbon steel ingot (φ140 mm × 450 mm) produced fully equiaxed grains in the cast ingot,indicating that the PMO process significantly promotes heterogeneous nucleation near the solid-liquid interface.The vigorous convection induced by PMO forced the partly solidified grains to move from the solid-liquid interface and became randomly distributed throughout the melt,which resulted in the formation of uniformly sized equiaxed dendrites throughout the whole ingot.Building on the developed nucleation mechanism and a flow field simulation of pure aluminum,a PMO-induced grain refinement model for steel is proposed.