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Characterization of Hot Deformation Behavior of a Fe-Cr-Ni-Mo-N Superaustenitic Stainless Steel Using Dynamic Materials Modeling

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Abstract

Hot deformation behavior of a Fe-24Cr-22Ni-7Mo-0.5N superaustenitic stainless steel was investigated by hot compression tests in a wide temperature range of 950-1250 °C and strain rate range of 0.001-10 s−1. The flow curves show that the flow stress decreases as the deformation temperature increases or the strain rate decreases. The processing maps developed on the basis of the dynamic materials model and flow stress data were adopted to optimize the parameters of hot working. It was found that the strain higher than 0.2 has no significant effect on the processing maps. The optimum processing conditions were in the temperature range of 1125-1220 °C and strain rate range of 0.1-3 s−1. Comparing to other stable domains, microstructural observations in this domain revealed the complete dynamic recrystallization (DRX) with finer and more uniform grain size. Flow instability occurred in the domain of temperature lower than 1100 °C and strain rate higher than 0.1 s−1.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Enxiang Pu

  2. Special Steel Institute, Central Iron and Steel Research Institute, Beijing, 100081, China

    Enxiang Pu, Wenjie Zheng, Zhigang Song, Han Feng & Yuliang Zhu

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  1. Enxiang Pu
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  2. Wenjie Zheng
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  3. Zhigang Song
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  4. Han Feng
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  5. Yuliang Zhu
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Correspondence to Enxiang Pu.

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Pu, E., Zheng, W., Song, Z. et al. Characterization of Hot Deformation Behavior of a Fe-Cr-Ni-Mo-N Superaustenitic Stainless Steel Using Dynamic Materials Modeling. J. of Materi Eng and Perform 26, 1424–1432 (2017). https://doi.org/10.1007/s11665-017-2550-9

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  • DOI: https://doi.org/10.1007/s11665-017-2550-9

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