Tensile Behavior of a TRIP-aided Ultra-fine Grained Steel Studied by Neutron Diffraction

DOI Web Site 24 Citations 47 References Open Access
  • Asoo Kazuya
    Graduate Student, Graduate School of Science and Engineering, Ibaraki University
  • Tomota Yo
    Graduate School of Science and Engineering/Frontier Research Center on Atomic Science, Ibaraki University
  • Harjo Stefanus
    MLF/J-PARC, Japan Atomic Energy Agency
  • Okitsu Yoshitaka
    Automobile R&D Center, Honda R&D Co., Ltd.

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Description

Tensile behavior of a nano-TRIP steel with 0.4 μm grain size showing tensile strength of 1326 MPa and total elongation of 23% was studied under in situ neutron diffraction. In spite of ultrafine grained structure, this steel realized a high work-hardening leading to a sufficient amount of uniform elongation. In the beginning of tensile deformation, Lüders band appeared similarly to many ultrafine grained materials. The stress induced martensitic transformation was found to occur during the Lüders deformation. A double-peak fitting was applied to the overlapped neutron diffraction profile for martensite and ferrite and then the stress partitioning behavior among ferrite, retained austenite and martensite were tracked during tensile deformation, revealing that the work-hardening after Lüders deformation was caused by higher load sharing of deformation induced martensite.

Journal

  • ISIJ International

    ISIJ International 51 (1), 145-150, 2011

    The Iron and Steel Institute of Japan

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