低碳低合金钢在临界区加热时奥氏体形成过程的研究

FORMATION OF AUSTENITE DURING INTERCRITICAL ANNEALING OF DUALS-PHASE STEELS

本文研究了低碳低合金钢在临界区温度加热时的奥氏体形成过程:奥氏体形核、珠光体溶解和向珠光体区域长入;向铁素体中缓慢长入和与铁素体二相之间的最后成分平衡过程等三个阶段。通过相界面微区合金成分分布测定,提出了控制奥氏体形成三阶段的限制环节和机理。

This article presents the formation of austenite during heating at temperatures of intercritical range in a series of low carbon low alloy steels. The austenite formation process was divided into three stages: (1) nucleation of austenite, dissolution of pearlite and growth of austenite into pearlite; (2) slower growth of austenite into ferrite; and (3) the final equilibration of two phases of austenite and ferrite. By analyzing the distribution of alloying elements at the interface of phase boundary, restrictions and mechanisms have been put forward for controlling the above three stages of austenite formation.