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采用扫描电子显微镜观察了Fe-0.88C-1.35Si-1.03Cr-0.43Mn钢不同相变产物的表面浮凸形貌,并使用光学及透射电子显微镜研究了等温10min条件下,上、下贝氏体相变产物的显微组织,以期获得有关贝氏体相变的新认识。结果表明,380℃等温10min条件下形成的上贝氏体呈现短棒状光学显微形貌,其精细结构由亚条排列组合而成,从而表面浮凸显示出边界不清晰、衬度不连续条状形貌;200℃等温10min条件下形成的下贝氏体呈现针状光学显微形貌,其精细结构显示为宽度尺寸在纳米数量级、长度却在μm数量级的片条;含硅钢的上、下贝氏体在相变早期以各自的相变方式形成。
The surface relief morphology of Fe-0.88C-1.35Si-1.03Cr-0.43Mn steel with different phase transformation products was observed by scanning electron microscope. The surface morphology of Fe-0.88C-1.35Si-1.03Cr-0.43Mn steel was investigated by optical and transmission electron microscopy Phase transformation products of the microstructure, in order to obtain new understanding of the bainite transformation. The results show that the upper bainite formed at 380 ℃ isothermal for 10min exhibits a short rod optical microstructure, the fine structure of which is formed by the combination of sub-strips, so that the surface embossment shows the boundary is not clear, the contrast discontinuities Morphology of the lower bainite formed at 200 ℃ isothermal 10min acicular optical microstructure, the fine structure showed as the width size in the order of nanometers, the length is in the order of μm slice; silicon steel, The lower bainite is formed in the respective phase transformations early in the phase transformation.