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Microstructures and hardness properties of laser clad Ni base two-phase intermetallic alloy coating

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Abstract

The two-phase Ni3Al and Ni3V intermetallic alloy laser clad on substrate of SUS304 was evaluated by hardness measurement, scanning electron microscopy, electron probe microanalyzer and transmission electron microscopy observations, focusing on the effect of post annealing after laser irradiation. The laser clad coating layer was diluted with approximately 5.4 at.% Fe and 1.6 at.% Cr stemming from the substrate. In the as-clad coating layer, the inhomogeneous eutectoid microstructure due to incomplete phase separation into two intermetallic phases Ni3Al and Ni3V took place. The hardness in the as-clad coating layer was lower than that in post annealed coating layers. In the coating layer annealed at 1553 K for 5 h, a dual two-phase microstructure composed of the primary cuboidal Ni3Al surrounded by the channel regions in which the major constituent is the Ni3V phase was observed, indicating that the complete eutectoid microstructure was developed. In the coating layer annealed at 1248 K for 24 h, the developed microstructure was lamellar-like one composed of the Ni3Al and Ni3V phases. The hardness in the coating layer annealed at 1248 K was the highest in the coatings observed in this study.

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ACKNOWLEDGMENT

This work was supported in part by JSPS KAKENHI Grant Number 26289263.

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Authors and Affiliations

  1. Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 5998531, Japan

    Takeshi Okuno, Yasuyuki Kaneno & Takayuki Takasugi

  2. Osaka Research Institute of Industrial Science and Technology, Izumi, Osaka, 5941157, Japan

    Takuto Yamaguchi & Hideki Hagino

  3. Trans-Regional Corporation Center, Institute for Materials Research, Tohoku University, Sakai, Osaka, 5998531, Japan

    Satoshi Semboshi

Authors
  1. Takeshi Okuno
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  2. Yasuyuki Kaneno
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  3. Takuto Yamaguchi
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  4. Satoshi Semboshi
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  5. Hideki Hagino
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  6. Takayuki Takasugi
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Correspondence to Takayuki Takasugi.

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Okuno, T., Kaneno, Y., Yamaguchi, T. et al. Microstructures and hardness properties of laser clad Ni base two-phase intermetallic alloy coating. Journal of Materials Research 32, 4531–4540 (2017). https://doi.org/10.1557/jmr.2017.352

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  • DOI: https://doi.org/10.1557/jmr.2017.352

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