论文部分内容阅读
采用静态拉伸试验、定量彩色金相和X射线衍射等方法,研究了含铌TRIP 800钢的微观组织和力学性能,采用EBSD分析了形变量对残余奥氏体体积分数的影响规律。结果表明,在亚临界加热温度为800℃,400℃贝氏体区等温条件下,含铌TRIP 800钢的显微组织中残留奥氏体量约为12%,强塑积最高可达22.185GPa%;随着形变量增大,残余奥氏体体积分数减小,塑性变形初期残余奥氏体转变比率最大。
The microstructure and mechanical properties of TRIP 800 steel with niobium were investigated by means of static tensile test, quantitative color metallography and X-ray diffraction. The influence of deformation on the volume fraction of retained austenite was analyzed by EBSD. The results show that the retained austenite content in the microstructure of Niobium-containing TRIP 800 steel is about 12% under the subcritical heating temperature of 800 ℃ and the isothermal temperature of 400 ℃ in bainite region. The maximum plastic modulus reaches 22.185GPa %. With the increase of deformation, the volume fraction of retained austenite decreases, and the ratio of retained austenite transformation at the initial stage of plastic deformation is the largest.