Verification of Thermodynamic Models for Predicting Grain Boundary Segregation of Carbon and Nitrogen in Ferritic Steels

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  • Zhou Yuxiong
    Graduate School of Engineering, Kyushu University
  • Masumura Takuro
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
  • Tsuchiyama Toshihiro
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University Research Center for Steel

説明

<p>The concentrations of C and N segregated at the grain boundaries (GB) in Fe–C, Fe–N binary alloys, and Fe–C–N ternary alloys were calculated using the McLean and the Hillert-Ohtani models. Comparison of the calculated data with experimental values obtained by three-dimensional atom probe tomography (3DAP) revealed that the experimental values were roughly explained by the Hillert-Ohtani model for the binary alloys. The McLean model also can predict similar results when the fraction of available sites in the GB layer is assumed to be saturated at 0.1. On the other hand, the Hall-Petch coefficient (ky) of Fe–C–N, determined from tensile tests, was linearly related to the predicted concentrations of segregated C and N. Proposedly, ky can be predicted from the chemical composition and heat treatment temperature via thermodynamic calculations.</p>

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