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Spinodal decomposition during aging of Fe-Ni-C martensites

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Abstract

A collaborative study of the aging of virgin Fe-Ni-C martensites has combined the techniques of transmission electron microscopy (TEM), atom-probe field-ion microscopy (APFIM), and electrical resistometry. Aging at room temperature leads to the rapid development of a finescale structural modulation along 〈203 〉 lattice directions. Atom-probe analysis of Fe-15Ni-lC martensite reveals the formation of carbon-rich regions whose carbon concentration increases with time and approaches 11 at. pct C on prolonged aging. The early stage kinetics of this process are composition-dependent and are consistent with carbon-diffusion control. The morphological features of the aging reaction are explained by elastic strain-energy considerations. In accordance with previous thermodynamic models, it is concluded that virgin Fe-C martensites are unstable and that phase separation occurs by a spinodal mechanism. The martensitic substructure does not appear to exert any substantial influence on this decomposition behavior.

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Authors and Affiliations

  1. Bethlehem Steel Corporation, 18016, Bethlehem, PA

    K. A. Taylor (Research Engineer)

  2. Industrial Technology Research Institute, Chutung, Hsinchu 31015, Republic of China

    L. Chang (Materials Research Laboratories)

  3. Department of Materials Science and Engineering, Northwestern University, 60208, Evanston, IL

    G. B. Olson (Professor)

  4. Massachusetts Institute of Technology, 02139, Cambridge, MA

    M. Cohen (Institute Professor Emeritus) & J. B. Vander Sande (Professor)

  5. University of Oxford, Oxford, UK

    G. D. W. Smith (Lecturer)

Authors
  1. K. A. Taylor
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  2. L. Chang
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  3. G. B. Olson
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  4. G. D. W. Smith
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  5. M. Cohen
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  6. J. B. Vander Sande
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Additional information

Due to tetragonality of the martensites in this paper, it should be noted that the third Miller index (representing the c-axis) is not interchangeable with the other two indices when obtaining equivalent variants.

K.A. Taylor, formerly with the Massachusetts Institute of Technology

L. Chang, formerly with the University of Oxford

G.B. Olson, formerly with the Massachusetts Institute of Technology

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Taylor, K.A., Chang, L., Olson, G.B. et al. Spinodal decomposition during aging of Fe-Ni-C martensites. Metall Trans A 20, 2717–2737 (1989). https://doi.org/10.1007/BF02670166

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  • DOI: https://doi.org/10.1007/BF02670166

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