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Research Article

Effect of Cr/Mn segregation on pearlite-martensite banded structure of high carbon bearing steel

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  • Received: 2 January 2020Revised: 5 March 2020Accepted: 6 March 2020Available online: 8 March 2020
  • The effect of Cr/Mn segregation on the abnormal banded structure of high carbon bearing steel was studied by reheating and hot rolling. Utilizing optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron-probe microanalyzer (EPMA), the segregation characteristics of alloying elements in cast billet and their relationship with hot rolled plate banded structure were revealed, and the formation reasons of abnormal banded structure and the elimination methods were analyzed. The results indicated that there was 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 ℃, and the spacing of element aggregation area increased, but the segregation index of alloy elements decreased. There are obvious alloying element segregation characteristics in the banded structure of the hot-rolled plate. This distinct white band is composed of martensitic phases. The reason for the formation of this abnormal pearlite/martensite banded structure is the interaction between the undercooled austenite transformation behavior of hot-rolled metal and the segregation of its alloying elements. Under the condition of air cooling after rolling, controlling the segregation index of alloy elements can reduce or eliminate the abnormal banded structure.
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Effect of Cr/Mn segregation on pearlite-martensite banded structure of high carbon bearing steel

  • 1. Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The effect of Cr/Mn segregation on the abnormal banded structure of high carbon bearing steel was studied by reheating and hot rolling. Utilizing optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron-probe microanalyzer (EPMA), the segregation characteristics of alloying elements in cast billet and their relationship with hot rolled plate banded structure were revealed, and the formation reasons of abnormal banded structure and the elimination methods were analyzed. The results indicated that there was 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 ℃, and the spacing of element aggregation area increased, but the segregation index of alloy elements decreased. There are obvious alloying element segregation characteristics in the banded structure of the hot-rolled plate. This distinct white band is composed of martensitic phases. The reason for the formation of this abnormal pearlite/martensite banded structure is the interaction between the undercooled austenite transformation behavior of hot-rolled metal and the segregation of its alloying elements. Under the condition of air cooling after rolling, controlling the segregation index of alloy elements can reduce or eliminate the abnormal banded structure.

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