热镀锌双相钢柔性化退火冷却制度的研究

为了开发柔性化退火技术,本研究利用连续退火实验模拟机,在双相区850℃对双相钢进行退火,随后以不同的冷却速率冷却,对获得的试样进行了显微组织的观察,并进行了力学性能测试。分析了冷却速率对双相钢显微组织的影响,讨论了显微组织与力学性能之间的关系。研究结果表明,第1阶段缓慢冷却,有利于得到纯净的铁素体,有利于消除屈服平台;第1、第2阶段均快速冷却,可以得到马氏体含量高的显微组织,试样抗拉强度提高,但变形曲线不光滑。第1、第2阶段冷却速率对热镀锌双相钢的显微组织与力学性能均有重要影响。

Research of Flexible Annealing Cooling Process for Hot-Dipped Galvanizing Dual Phase Steel

An investigation was carried out to examine the effects of cooling rate on the microstructure and mechanical properties of dual phase steel（of composition 0.15wt%C,0.1wt%Si,1.7wt%Mn） by continuous annealing simulator.The steel was heated to 850℃and holding for 30s,then cooled down to 460℃and holding for 12s at different cooling rate（CR_1）.At last,the steel was cooled down to room temperature at different cooling rate（CR_2）.The mechanical properties were tested and the microstructures were observed.The experimental results show that not only CR_1 but also CR_2 is important to the mechanical properties of the dual phase steel.