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Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels

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Abstract

The microstructure in welding heat-affected zones of 5 wt.% manganese steels was studied, and its effect on impact toughness was analyzed. The simulated coarse-grained heat-affected zone (CGHAZ) had the lowest impact toughness of ~ 39 J at − 40 °C because of coarse-grained structure and least volume fraction of retained austenite (RA) of 1.2 vol.%. The impact toughness of simulated intercritical heat-affected zone (ICHAZ) and fine-grained heat-affected zone (FGHAZ) were ~ 165 and ~ 45 J, respectively, at − 40 °C. The effective grain size of simulated FGHAZ was smaller than that of the simulated ICHAZ. Furthermore, microstructural investigation revealed that the simulated FGHAZ and ICHAZ had similarity in volume fraction and stability of RA. However, tempered martensite was present in ICHAZ and absent in FGHAZ. It is proposed that the presence of tempered martensite contributed to good impact toughness in simulated ICHAZ.

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Acknowledgements

Authors gratefully acknowledge the support from National Natural Science Foundation of China (No. 2015AA03A501).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Jun-hui Li, Hong-hong Wang & Qiang Luo

  2. Research Institute of Nanjing Iron and Steel Co., Ltd., Nanjing, 210035, Jiangsu, China

    Li Li & Chao Sun

  3. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX, 79968, USA

    R. D. K. Misra

Authors
  1. Jun-hui Li
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  2. Hong-hong Wang
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  3. Qiang Luo
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  4. Li Li
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  5. Chao Sun
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  6. R. D. K. Misra
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Correspondence to Hong-hong Wang.

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Li, Jh., Wang, Hh., Luo, Q. et al. Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels. J. Iron Steel Res. Int. 26, 761–770 (2019). https://doi.org/10.1007/s42243-019-00274-2

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  • DOI: https://doi.org/10.1007/s42243-019-00274-2

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