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通过光学显微镜、扫描电镜(SEM)和能谱仪(EDS)等显微组织分析方法研究了45CrNiMoV钢热轧材和正火后的显微组织和元素偏析情况。结果表明:实验钢轧材中Mo元素的偏析程度最为严重;在不同的正火工艺中,采用920℃正火20 h的均匀化工艺,可有效降低Mo元素的偏析程度;分析了两种残余偏析指数模型,第一种残余偏析指数模型与实验结果基本吻合,可以用于预测和评价45CrNiMoV钢正火均匀化工艺。
The microstructure and elemental segregation of 45CrNiMoV hot-rolled steel and normalized steel were studied by means of optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the degree of segregation of Mo is the most serious in the experimental steel. In different normalizing processes, the homogenization process with normalizing at 920 ℃ for 20 h can reduce the segregation of Mo effectively. Segregation index model, the first residual segregation index model and the experimental results are basically consistent, can be used to predict and evaluate the 45CrNiMoV normalizing steel homogenization process.