研究了不同温度和时间的淬火-配分(Q-P)处理工艺对新型高硅(Si含量为0.82 mass％)热成形钢组织与力学性能的影响,采用光学显微镜(OM)和扫描电镜(SEM)对试样的微观组织进行了观察.结果表明,材料为板条马氏体+残留奥氏体组织,存在较多的M/A岛.当淬火温度为260℃,配分300 s时,材料的强塑积最高,达到22.3 GPa·％,且伸长率为13.3％,远高于商用热成形钢的6.6％.XRD和磁性法测得该处理条件下的残留奥氏体含量分别为5.2％和7.98％,透射电子显微镜(TEM)观察到薄膜状残留奥氏体.分析表明,淬火-配分处理后,保留至室温的富碳残留奥氏体对于提高材料的塑性起到了主要作用.
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