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Extended strain hardening by a sequential operation of twinning induced plasticity and transformation induced plasticity in a low Ni duplex stainless steel

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Abstract

Extended strain hardening was realized by a sequential operation of twinning induced plasticity (TWIP) followed by transformation induced plasticity (TRIP) in a Fe-20Cr-3Mn-2Cu-1Ni-1Si-0.2N duplex stainless steel (DSS). As a result, the present DSS exhibited an excellent combination of strength — ductility of 900 MPa which was 75% superior to that of conventional DSSs. The deformed microstructures of the present DSS revealed that strain induced martensite (SIM) causing TRIP primarily nucleated at intersections of mechanical twins without formation of ε martensite which is an intermediate phase during SIM transformation. In addition, the sequential operation of TWIP-TRIP enables strain hardening to be extended to higher strains compared to the operation of TWIP alone.

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Authors and Affiliations

  1. STS Product Group, POSCO Technical Research Lab., Pohang, 790-785, Korea

    Jeom Yong Choi

  2. Dept. of Mater. Sci. & Eng., Hanbat National University, Daejeon, 305-719, Korea

    Si Woo Hwang, Min Chul Ha & Kyung-Tae Park

Authors
  1. Jeom Yong Choi
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  2. Si Woo Hwang
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  3. Min Chul Ha
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  4. Kyung-Tae Park
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Correspondence to Kyung-Tae Park.

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Choi, J.Y., Hwang, S.W., Ha, M.C. et al. Extended strain hardening by a sequential operation of twinning induced plasticity and transformation induced plasticity in a low Ni duplex stainless steel. Met. Mater. Int. 20, 893–898 (2014). https://doi.org/10.1007/s12540-014-5014-x

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  • DOI: https://doi.org/10.1007/s12540-014-5014-x

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