Internal Stress of Plate Martensite Depending on Aspect Ratio via fcc-hcp Martensitic Transformation in Metastable Austenitic Stainless Steels

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  • Wada Yuki
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Nakada Nobuo
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Onaka Susumu
    Department of Materials Science and Engineering, Tokyo Institute of Technology

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<p>Internal stress generated by athermal martensitic transformation from fcc (face-centered cubic) to hcp (hexagonal close-packed) was investigated in 18Cr–8Ni metastable austenitic stainless steel. Lattice parameter ratio of hcp-martensite, c/a, formed by subzero treatment was evaluated accurately by means of electron back scatter diffraction technique. The evaluation revealed that hcp-martensite surrounded by fcc-austenite matrix has obviously higher c/a compared with the reference value in the case when hcp-martensite exists in a single body, and the c/a is continuously increased with increasing the aspect ratio of the plate-shaped hcp-martensite. However, additional formation of martensite with bcc (body centered cubic) reduced the c/a of hcp-martensite suddenly. From the point of view of micromechanics, it can be concluded that internal stress is dynamically increased by the thickening of plate martensite on fcc-hcp martensitic transformation, and the subsequent hcp-bcc martensitic transformation is stimulated to accommodate the internal stress.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (1), 61-67, 2020-01-01

    公益社団法人 日本金属学会

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