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Tensile Deformation Behavior and Phase Transformation in the Weld Coarse-Grained Heat-Affected Zone of Metastable High-Nitrogen Fe-18Cr-10Mn-N Stainless Steel

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Abstract

The tensile deformation behavior and phase transformation in the weld coarse-grained heat-affected zone (CGHAZ) of a metastable high-nitrogen austenitic stainless steel was explored through tensile tests, nanoindentation experiments, and transmission electron microscopy analysis. True stress–strain response during tensile test was found to be seriously affected by δ-ferrite fraction, which depends on peak temperature of the CGHAZs. The strain-induced martensitic transformation (SIMT) occurred in base steel, whereas the SIMT disappeared and deformation twinning occurred predominantly in the CGHAZs. The relationship among true stress–strain response, nanoindentation hardness, and deformed microstructures was carefully investigated and discussed in terms of changes of stacking fault energy.

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Acknowledgments

This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea. The authors wish to thank Sang-Ho Han and Moo-Young Seok for their valuable support for the experimental works.

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Authors and Affiliations

  1. Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 642-831, Republic of Korea

    Joonoh Moon (Senior Researcher), Tae-Ho Lee (Principal Researcher), Seong-Jun Park (Senior Researcher) & Heon-Young Ha (Senior Researcher)

  2. Division of Material Science and Engineering, Hanyang University, Seoul, 133-791, Republic of Korea

    Jae-il Jang (Professor)

  3. Department of Materials Science and Engineering, University of Science and Technology, Yuseong-ku, Daejeon, 305-350, Republic of Korea

    Min-Ho Jang (Researcher)

  4. Department of Materials Science and Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea

    Byoungchul Hwang (Assistant Professor)

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  1. Joonoh Moon
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  2. Tae-Ho Lee
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  4. Jae-il Jang
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  5. Min-Ho Jang
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  7. Byoungchul Hwang
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Correspondence to Joonoh Moon.

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Moon, J., Lee, TH., Park, SJ. et al. Tensile Deformation Behavior and Phase Transformation in the Weld Coarse-Grained Heat-Affected Zone of Metastable High-Nitrogen Fe-18Cr-10Mn-N Stainless Steel. Metall Mater Trans A 44, 3069–3076 (2013). https://doi.org/10.1007/s11661-013-1682-2

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