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Investigation of Microstructure and Mechanical Properties of Fe-V Dissimilar Welds

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Abstract

This paper presents a systematic investigation of solidification and phase formation, microstructures, and mechanical behavior of Fe-V weld metals. It is found that V weld metal is dominated by Fe25V solid solution (hardness ~ 6.1 GPa) with V-rich precipitates formed along the grain boundaries. The observed intergranular cracking is attributed to the phase separation of (αFe, V) solid solution into V-rich (V) and V-poor (Fe25V) regions at low temperature. The overall mechanical properties could be improved by using Cu20V composite filler, due to the formation of stable Fe10V and Cu solid solution phases.

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Acknowledgments

This work was supported by Doctorial Innovation Fund (Grant No. 207-002j1405), Doctorial Cultivation Fund of Xi’an University of Technology and Australian Research Council Discovery Project (DP150101717). The data reported in this paper were obtained at the Central Analytical Research Facility (CARF) with the technical assistance of Dr. Jamie Riches, Mr. Tony Raftery, and Dr. Annalena Wolff at the Institute for Future Environments (QUT).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Qiaoling Chu, Min Zhang & Jihong Li

  2. College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China

    Ning Hu

  3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, 4001, Australia

    Qiaoling Chu & Cheng Yan

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  1. Qiaoling Chu
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  2. Min Zhang
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  3. Jihong Li
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  4. Ning Hu
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Correspondence to Min Zhang or Cheng Yan.

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Manuscript submitted November 23, 2017.

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Chu, Q., Zhang, M., Li, J. et al. Investigation of Microstructure and Mechanical Properties of Fe-V Dissimilar Welds. Metall Mater Trans A 49, 5402–5410 (2018). https://doi.org/10.1007/s11661-018-4840-8

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