Advancing Duplex Stainless Steel Microstructure: Synergistic Ferrite Grain Refinement and Austenite Formation Through Permanent Magnet Stirring
摘要
The effect of permanent magnet stirring (PMS) on the as-cast microstructure of duplex stainless steel was investigated. It is found that high-speed PMS induces turbulent flow, leading to ferrite refinement and the emergence of numerous substructures, further fostering austenite formation. Additionally, its intense electromagnetic force aids in the diffusion of Cr, Mo, Ni, etc., boosting austenite growth. Consequently, it simultaneously achieves enhanced ferrite refinement and a substantial increase in the fraction of austenite.