设计了一种超低碳低活化铁素体/马氏体钢,利用扫描电镜(SEM)、透射电镜(TEM)和拉伸试验等方法观察和测定了实验钢调质处理后的显微组织和力学性能,研究了工艺、组织和性能之间的关系.结果表明:经980℃保温1h完全奥氏体化淬火与750℃保温1h空冷后,实验钢具有最佳的综合力学性能,室温屈服强度为541 MPa,抗拉强度为668 MPa,伸长率为25％;600℃高温屈服强度为294 MPa,抗拉强度为321 MPa,伸长率为29％.调质处理后实验钢的组织为铁素体与球状析出物组成回火索氏体,其中析出相粒子由纳米级的M23C6和TaC构成.
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