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Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi

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Abstract

The high entropy alloy CrMnFeCoNi has been shown to have promising structural properties. For a new alloy to be used in a structural application it should be weldable. In the present study, friction stir welding (FSW) and laser welding (LW) techniques were used to butt weld thin plates of CrMnFeCoNi. The microstructure, chemical homogeneity and mechanical behavior of the welds were characterized and compared with the base metal. The tensile stress-strain behavior of the welded specimens were reasonable when compared with that of the base metal. FSW refined the grain size in the weld region by a factor of ∼14 when compared with the base metal. High-angle annular dark field transmission electron microscopy in combination with energy dispersive X-ray spectroscopy showed chemical inhomogeneity between dendritic and interdendritic regions in the fusion zone of LW. Large fluctuations in composition (up to 15 at%) did not change the crystal structure in the fusion zone. Hardness measurements were carried out in the weld cross section and discussed in view of the grain size, low angle grain boundaries and twin boundaries in FSW specimens and the dendritic microstructure in LW specimens.

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Authors and Affiliations

  1. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea

    Min-Gu Jo, Han-Jin Kim, Jin-Yoo Suh & Dong-Ik Kim

  2. Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea

    Min-Gu Jo, Minjung Kang, Phaniraj P. Madakashira, Eun Soo Park & Heung Nam Han

  3. Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea

    Han-Jin Kim

  4. Welding and Joining Research Group, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea

    Minjung Kang

  5. School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, Republic of Korea

    Sung-Tae Hong

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  1. Min-Gu Jo
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  2. Han-Jin Kim
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  3. Minjung Kang
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Correspondence to Phaniraj P. Madakashira or Heung Nam Han.

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Jo, MG., Kim, HJ., Kang, M. et al. Microstructure and mechanical properties of friction stir welded and laser welded high entropy alloy CrMnFeCoNi. Met. Mater. Int. 24, 73–83 (2018). https://doi.org/10.1007/s12540-017-7248-x

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  • DOI: https://doi.org/10.1007/s12540-017-7248-x

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