Nb微合金化热轧TRIP钢组织性能

Research on microstructure and mechanical properties of Nb micro-alloying TRIP steel prepared by hot rolling

在实验室采用热轧控冷工艺制备了Nb微合金化热轧TRIP钢,并对其进行了力学性能检测,通过光学显微镜、激光共聚焦显微镜、扫描电镜、EBSD及X射线衍射对该钢的组织进行了观察。结果表明:试验钢力学性能为:屈服强度为535～552 MPa,抗拉强度740～745 MPa,屈强比R eL/R m为0.71～0.74,伸长率A80为28.5%～31.0%;试验钢组织为典型的铁素体、贝氏体、残留奥氏体三相组织,残留奥氏体体积分数为12.3%,EBSD观察表明残留奥氏体尺寸大多数在1μm以下。

Microstructure and mechanical properties of Nb micro-alloying TRIP steel prepared by hot rolling and controlling cooling in laboratory were studied by OP,LSCM,SEM,EBSD and XRD. The results show that the mechanics properties of experimental TRIP steel are yield strength of 535-552 MPa,tensile strength of 740-745 MPa,ratio of yield strength to tensile strength of 0. 71-0. 74,and high elongation of 28. 5%-31. 0%; The microstructure is composed of ferrite,bainite and retained austenite. The volume fraction of retained austenite is about 12. 3%,most of retained austenite size is under 1 μm by EBSD.