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Stress-Assisted and strain-induced martensites in FE-NI-C alloys

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Abstract

A metallographic study was made of the martensite formed during plastic straining of metastable, austenitic Fe-Ni-C alloys withMs temperatures below 0°C. A comparison was made between this martensite and that formed during the deformation of two TRIP steels. In the Fe-Ni-C alloys two distinctly different types of martensite formed concurrently with plastic deformation. The large differences in morphology, distribution, temperature dependence, and other characteristics indicate that the two martensites form by different transformation mechanisms. The first type, stress-assisted martensite, is simply the same plate martensite that forms spontaneously belowMs except that it is somewhat finer and less regularly shaped than that formed by a temperature drop alone. This difference is due to the stress-assisted martensite forming from cold-worked austenite. The second type, strain-induced martensite, formed along the slip bands of the austenite as sheaves of fine parallel laths less than 0.5μm wide strung out on the {111}γ planes of the austenite. Electron diffraction indicated a Kurdjumov-Sachs orientation for the strain-induced martensite relative to the parent austenite. No stress-assisted, plate martensite formed in the TRIP steels; all of the martensite caused by deformation of the TRIP steels appeared identical to the strain-induced martensite of the Fe-Ni-C alloys. It is concluded that the transformation-induced ductility of the TRIP steels is a consequence of the formation of strain-induced martensite.

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Authors and Affiliations

  1. Escuela de Ingenieria Metalurgica y Ciencia de los Materiales, Universjdad Central de Venezuela, Caracas, Venezuela

    P. C. Maxwell (Assistant Professor)

  2. Lawrence Livermore Laboratory, University of California, 94550, Livermore, California

    A. Goldberg (Senior Scientist)

  3. Materials Science and Engineering Department, Stanford University, Stanford, California

    J. C. Shyne (Professor and Chairman, Consultant)

  4. Lawrence Livermore Laboratory, USA

    J. C. Shyne (Professor and Chairman, Consultant)

Authors
  1. P. C. Maxwell
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  2. A. Goldberg
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  3. J. C. Shyne
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Formerly a graduate student at Stanford University

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Maxwell, P.C., Goldberg, A. & Shyne, J.C. Stress-Assisted and strain-induced martensites in FE-NI-C alloys. Metall Trans 5, 1305–1318 (1974). https://doi.org/10.1007/BF02646613

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