The results indicate that niobium compounds form during solidification, leading to the refinement of austenite grains.The mechanism of grain refinement has been investigated extensively.

• 提出:铌化物是在凝固过程中形成,具有细化奥氏体晶粒的作用,并分析研究了铌细化高锰钢奥氏体晶粒的机制。