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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1 h完全奥氏体化淬火与750℃保温1 h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。
A kind of ultra-low carbon and low activation ferrite / martensitic steel was designed. The microstructure of quenched and tempered steel was observed and measured by scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile test And mechanical properties, studied the relationship between technology, organization and performance. The results show that the experimental steel has the best comprehensive mechanical properties after fully austenitizing quenching at 980 ℃ for 1 h and air cooling at 750 ℃ for 1 h, the yield strength at room temperature is 541 MPa, the tensile strength is 668 MPa, elongation Rate of 25%; 600 ℃ high temperature yield strength of 294 MPa, tensile strength of 321 MPa, elongation of 29%. After quenching and tempering, the microstructure of experimental steel is that the ferrite and spherical precipitates are composed of tempered sorbite, in which the precipitated phase particles are composed of nanoscale M23C6 and TaC.