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Effect of silicon on the spheroidization of cementite in hypereutectoid high carbon chromium bearing steels

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Abstract

The effect of silicon on the spheroidization of cementite in hypereutectoid high carbon chromium bearing steels has been investigated on the basis of microstructural analysis and thermodynamic calculations. The results showed that an increase of silicon content in high carbon chromium bearing steels retards the spheoridization of cementite. The thermodynamic calculations revealed that the shrinkage of the austenite phase field in bearing steels with increasing silicon content gave rise to an increase of volume fraction of cementite at an annealing temperature, possibly resulting in incomplete spheroidization. Furthermore, due to the low solubility of silicon in cementite, an increase of silicon content can raise the activity or chemical potential of carbon atoms in austenite at the austenite/cementite interfaces. Consequently, the difference in chemical potential of carbon atoms at the interfaces would be reduced with increasing silicon content, causing a decrease of the driving force for their diffusion from cementite to austenite.

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Authors and Affiliations

  1. Technical Research Laboratories, POSCO, 1 Goedong-dong, Nam-gu, Pohang-si, Gyeongbuk, 790-875, Korea

    Kwan-Ho Kim, Jae-Seung Lee & Duk-Lak Lee

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  1. Kwan-Ho Kim
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  2. Jae-Seung Lee
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  3. Duk-Lak Lee
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Correspondence to Kwan-Ho Kim.

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Kim, KH., Lee, JS. & Lee, DL. Effect of silicon on the spheroidization of cementite in hypereutectoid high carbon chromium bearing steels. Met. Mater. Int. 16, 871–876 (2010). https://doi.org/10.1007/s12540-010-1203-4

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  • DOI: https://doi.org/10.1007/s12540-010-1203-4

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