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本文通过研究不同状态(未形变、形变后再结晶、形变后未再结晶)的奥氏体的γ→α转变动力学,探讨了奥氏体形变细化铁素体晶粒的机理,指出形变奥氏体中的贮存能主要分布在其晶界附近,使γ→α转变的形核功减小、形核密度增大。对比含铌钢与无铌钢的转变动力学及再结晶动力学,认为对于形变奥氏体来说,微量合金元素的主要作用是抑制贮存能在相变之前释放。
In this paper, the kinetics of γ → α transformation of austenite in different states (without deformation, recrystallization after deformation and without recrystallization after deformation) is studied. The mechanism of austenite grain refinement ferrite grains is discussed, and the deformation The storage in austenite can be mainly distributed around the grain boundaries, which decreases the nucleation work of γ → α transformation and increases the nucleation density. In contrast to the transformation kinetics and recrystallization kinetics of niobium-bearing steels and niobium-free steels, it is believed that the main effect of trace alloying elements on the deformation of austenite is to inhibit the release of storage energy prior to phase transformation.