Fe—C—Mn双相钢奥氏体形成动力学

本文采用OM及SEM金相定量研究了亚临界(低于A_(C1))退火对冷轧态Fe-c-Mn双相钢临界区(A_(C1)～A_(C3))奥氏体形成动力学的影响,采用STEM能谱分析及SEM波谱分析测定了在亚临界退火过程中碳化物中锰浓度的变化及在临界区形成的奥氏体的锰浓度。实验结果表明,亚临界退火过程发生锰向碳化物中的平衡偏聚,从而使临界区形成的奥氏体具有较高的锰含量,提高奥氏体的淬透性。这对于周期退火双相钢板的生产具有重要意义。

Influences of Subcritical Annealing on the Austenite Transformation in Fe-C-Mn Dual Phase Steel

The Influences of subcritical annealing on the austenite transformation kinetics in the intercritical annealing of Fe-C-Mn dual phase steels are studied by means of OM, SEM. And using EDX, WDS technology, Mn-partitioning in carbide during subcritical annealing are measured. The results show that subcritical annealing is believed to prompt the Mn-partitioning to carbide, and to form a Mn-rich austenite during the intercritical annealing. Therefore, the hardenability of austenite is increased during batch annealing. It should be applicable for batch annealing processing of dual phase steels.