The effect of Cr/Mn segregation on the abnormal banded structure of high carbon bearing steel was studied by reheating and hot rolling. With the use of an optical microscope, scanning electron microscope, transmission electron microscope, and electron probe microanalyzer, the segregation characteristics of alloying elements in cast billet and their relationship with hot-rolled plate banded structure were revealed. The formation causes of an abnormal banded structure and the elimination methods were analyzed. Results indicate the serious positive segregation of C, Cr, and Mn alloy elements in the billet. Even distribution of Cr/Mn elements could not be achieved after 10 h of heat preservation at 1200°C, and the spacing of the element aggregation area increased, but the segregation index of alloy elements decreased. Obvious alloying element segregation characteristics are present in the banded structure of the hot-rolled plate. This distinct white band is composed of martensitic phases. The formation of this abnormal pearlite-martensite banded structure is due to the interaction between the undercooked austenite transformation behavior of hot-rolled metal and the segregation of its alloying elements. Under the air cooling after rolling, controlling the segregation index of alloy elements can reduce or eliminate the abnormal banded structure.

通过再加热和热轧研究了Cr / Mn偏析对高碳轴承钢异常带状组织的影响。利用光学显微镜，扫描电子显微镜，透射电子显微镜和电子探针显微分析仪，揭示了铸坯中合金元素的偏析特征及其与热轧板带结构的关系。分析了异常带状结构的形成原因和消除方法。结果表明，钢坯中的C，Cr和Mn合金元素存在严重的正偏析。1200℃保温10h后，Cr / Mn元素的分布不均匀，元素聚集区的间距增加，合金元素的偏析指数降低。在热轧板的带状组织中存在明显的合金元素偏析特征。这个独特的白带由马氏体相组成。这种异常的珠光体-马氏体带状结构的形成是由于热轧金属的未熟奥氏体转变行为与其合金元素的偏析之间的相互作用。在轧制后的空气冷却下，控制合金元素的偏析指数可以减少或消除异常的带状组织。这种异常的珠光体-马氏体带状结构的形成是由于热轧金属的未熟奥氏体转变行为与其合金元素的偏析之间的相互作用。在轧制后的空气冷却下，控制合金元素的偏析指数可以减少或消除异常的带状组织。这种异常的珠光体-马氏体带状结构的形成是由于热轧金属的未熟奥氏体转变行为与其合金元素的偏析之间的相互作用。在轧制后的空气冷却下，控制合金元素的偏析指数可以减少或消除异常的带状组织。