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Ductility and strain-induced transformation in a high-strength transformation-induced plasticity-aided dual-phase steel

  • Mechanical Behavior
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Abstract

The influence of forming temperature and strain rate on the ductility and strain-induced transformation behavior of retained austenite in a ferritic 0.4C-1.5Si-1.5Mn (wt pct) dual-phase steel containing fine retained austenite islands of about 15 vol pct has been investigated. Ex- cellent combinations of total elongations (TELs), about 48 pct, and tensile strength (TS), about 1000 MPa, were obtained at temperatures between 100 °C and 200 °C and at a strain rate of 2.8 X 10-4/s. Under these optimum forming conditions, the flow curves were characterized by intensive serrations and increased strain-hardening rate over a large strain range. The retained austenite islands were mechanically the most stable at temperatures between 100 °C and 200 °C, and the retained austenite stability appeared to be mainly controlled by strain-induced martensite and bainite transformations (SIMT and SIBT, respectively), with deformation twinning occur- ring in the retained austenite. The enhanced TEL and forming temperature dependence of TEL were primarily connected with both the strain-induced transformation behavior and retained aus- tenite stability.

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Authors and Affiliations

  1. Department of Functional Machinery and Mechanics, Shinshu University, 386, Veda, Japan

    Koh-Ichi Sugimoto (Associate Professor)

  2. Department of Mechanical Systems Engineering, Shinshu University, 380, Nagano, Japan

    Mitsuyuki Kobayashi (Professor)

  3. Iron & Steel Research Laboratories, Kobe Steel Ltd., 675, Kakogawa, Japan

    Shun-Ichi Hashimoto (Assistant General Manager)

Authors
  1. Koh-Ichi Sugimoto
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  2. Mitsuyuki Kobayashi
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  3. Shun-Ichi Hashimoto
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Sugimoto, KI., Kobayashi, M. & Hashimoto, SI. Ductility and strain-induced transformation in a high-strength transformation-induced plasticity-aided dual-phase steel. Metall Trans A 23, 3085–3091 (1992). https://doi.org/10.1007/BF02646127

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  • DOI: https://doi.org/10.1007/BF02646127

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