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A reevaluation of the Fe-N and Fe-C-N systems

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Journal of Phase Equilibria

Abstract

The γ′/ε phase boundary in the Fe-N and Fe-C-N systems plays an important role in the nitriding and nitrocarburizing processes. A study has been undertaken in order to resolve the discrepancy between previous calculations and experiments on the γ′/ε equilibrium.1–4 The narrow composition range of the γ′ phase is introduced by applying a two-sublattice solution model, which gives a more accurate description of the phase boundaries involving γ′ and ε. Furthermore, an estimation procedure based on the systematics of bonding properties and vibrational entropy of 3d-transition metal compounds5,6 is used to modify the descriptions of the cementite and the χ carbonitrides in Fe-C-N, which were not well established in the most recent assessment.4

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  1. Division of Physical Metallurgy Department of Materials Science and Engineering, Royal Institute of Technology, S-100 44, Stockholm, Sweden

    H. Du

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Du, H. A reevaluation of the Fe-N and Fe-C-N systems. JPE 14, 682–693 (1993). https://doi.org/10.1007/BF02667880

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