Geometry of Butterfly Martensite in Fe-18Ni-0.7Cr-0.5C Alloy

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  • Takahashi Nozomi
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Shinozaki Sho
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Shinohara Yuri
    Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology
  • Tanaka Yasuaki
    Steel Research Laboratories, Nippon Steel Corporation
  • Kawata Hiroyuki
    Steel Research Laboratories, Nippon Steel Corporation
  • Inamura Tomonari
    Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology

説明

<p>To clarify the geometry of the junction of martensite which forming butterfly-type martensite, electron microscopy, theoretical analysis using the phenomenological theory of martensite crystallography and rank-1 connection were carried out on Fe-18Ni-0.7Cr-0.5C (mass%) alloy. Martensite plates in this alloy exhibit {252}γ habit plane and K-S OR and are in good agreement with the double shear PTMC by Ross and Crocker. The frequency of formation of V1/V2 and V1/V16 (butterflies) pairs was 20% each, with these two pairs alone accounting for 40% of the total. Theoretical analysis using rank-1 connection of variants revealed that butterfly-pairing is not a geometrically compatible morphology, even for alloys in which butterfly martensite forms frequently. We have also revealed theoretically that the junction plane of the butterfly-pairing keeps (100)γ independent of the mode of lattice invariant shear (i.e. morphology of martensite plate). Preferential formation mechanism for butterfly-pairing is discussed based on the common lattice invariant deformation between V1 and V16.</p>

収録刊行物

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