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Crystallographic Orientation Dependence of Deformation-Induced Martensitic Transformation of 1.3 GPa-Class 0.6%C Bainitic Steel with Retained Austenite

15 Pages Posted: 6 Oct 2020 Publication Status: Accepted

See all articles by Rintaro Ueji

Rintaro Ueji

National Institute for Materials Science

Akinobu Shibata

Kyoto University - Department of Materials Science and Engineering; National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Kohsaku Ushioda

Osaka University - Joining and Welding Research Institute

Yuji Kimura

National Institute for Materials Science

Takahito Ohmura

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Tadanobu Inoue

National Institute for Materials Science

Abstract

The crystallographic orientation dependence of the stability of retained austenite against deformation-induced martensitic transformation in 0.6%C alloyed steel was studied. A bainite structure with about 40% volume fraction of retained austenite was successfully obtained by austempering. Tensile testing at room temperature revealed a high strength of 1.3 GPa with adequate elongation. A change in texture of retained austenite brought about by tensile deformation to several strains was measured. Deformation-induced martensitic transformation occurred in grains with the tensile axis nearly parallel to <111>fcc was significantly stabilized. The orientation dependence of the martensitic transformation was compatible with that of the {1-11}fcc <121>fcc shear deformation which can be regarded as the first primitive process for the martensitic transformation as proposed by Bogers and Burgers. This compatibility is discussed in terms of the elastically normalized Schmid factor for the transformation dislocation to act for the lattice change.

Keywords: martensite, transformation-induced plasticity, orientation dependence, elastic anisotropy, medium carbon steel

Suggested Citation

Ueji, Rintaro and Shibata, Akinobu and Ushioda, Kohsaku and Kimura, Yuji and Ohmura, Takahito and Inoue, Tadanobu, Crystallographic Orientation Dependence of Deformation-Induced Martensitic Transformation of 1.3 GPa-Class 0.6%C Bainitic Steel with Retained Austenite (2020). Available at SSRN: https://ssrn.com/abstract=3692032 or http://dx.doi.org/10.2139/ssrn.3692032

Rintaro Ueji (Contact Author)

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Akinobu Shibata

Kyoto University - Department of Materials Science and Engineering

Yoshida-Honmachi
Sakyo-ku
Kyoto, 606-8501
Japan

National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Japan

Kohsaku Ushioda

Osaka University - Joining and Welding Research Institute

1-1 Yamadaoka
Suita
Osaka, 565-0871
Japan

Yuji Kimura

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Takahito Ohmura

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Japan

Tadanobu Inoue

National Institute for Materials Science

Tsukuba, Ibaraki 305-0047
Japan

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