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Coarsening resistance of M2C carbides in secondary hardening steels: Part I. Theoretical model for multicomponent coarsening kinetics

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Abstract

The development of very high-strength levels in many alloy steels is achieved by a secondary hardening reaction. In high Co-Ni steels containing the strong carbide-forming elements Mo, Cr, and W, secondary hardening is accomplished by the precipitation of fine-scale M2C alloy carbides. Coarsening resistance of the M2C precipitates depends on the alloy content of these elements, and there should be an addition to the alloy of these carbide-forming elements which optimizes the M2C coarsening resistance. Current Lifshitz-Slyozov-Wagner (LSW) theory[2,3] cannot properly be used to describe, the coarsening behavior of multicomponent carbides, which involves concentrations and diffusivities of two or more solutes and nonspherical carbide morphologies. A model is introduced for the coarsening resistance of multicomponent carbides. This model treats the coarsening of shape-preserving particle and is applicable to rodlike particles.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejon, Korea

    Hyuck Mo Lee (Assistant Professor)

  2. the Center for Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    Samuel M. Allen (Associate Professor)

  3. the Department of Mechanical Engineering, Clemson University, 29631, Clemson, SC

    Mica Grujicic (Assistant Professor)

Authors
  1. Hyuck Mo Lee
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  2. Samuel M. Allen
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  3. Mica Grujicic
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Lee, H.M., Allen, S.M. & Grujicic, M. Coarsening resistance of M2C carbides in secondary hardening steels: Part I. Theoretical model for multicomponent coarsening kinetics. Metall Trans A 22, 2863–2868 (1991). https://doi.org/10.1007/BF02650247

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