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Influence of Plasma Remelting on the Microstructure and Cavitation Resistance of Arc-Sprayed Fe-Mn-Cr-Si Alloy

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Abstract

Surface remelting is an important technique for modifying the microstructure of thermally sprayed coatings as it reduces the porosity and promotes a metallurgical bond between substrate and coating. Many studies have been carried out in the field of materials selection and surface engineering in an attempt to reduce cavitation damage. In this work, an Fe-Mn-Cr-Si alloy was deposited by arc spraying and then remelted by a plasma-transferred arc process. The base metal was a soft martensitic stainless steel. The influence of remelting current on coating and base metal microstructure and cavitation resistance was studied. The use of a lower mean current and a pulsed arc reduced the thickness of the heat-affected zone. In specimens remelted with constant arc current, dendrites were aligned parallel to the path followed by the plasma torch; while in those remelted with a pulsed plasma arc, the alignment of the microstructure was disrupted. The use of a higher peak current in pulsed-current plasma transferred arc remelting reduced mass loss due to cavitation. Fe-Mn-Cr-Si coatings exhibited cavitation-induced hardening, with martensite formation during cavitation tests. This transformation helps to increase the cavitation resistance of the remelted coating compared with the soft martensitic stainless steel base metal.

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Acknowledgments

The authors wish to thank the Fundação Araucária for providing financial support; the Institute of Technology for Development; LACTEC for assisting with the characterization of the coatings; DURUM for providing the wires; and Voith for providing the ASTM A743-CA6NM used in this work.

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Authors and Affiliations

  1. Technological Federal University of Paraná, Ponta Grossa, PR, Brazil

    A. G. M. Pukasiewicz & P. R. C. Alcover Jr.

  2. Institute of Technology for Development, Curitiba, PR, Brazil

    A. R. Capra

  3. Federal University of Paraná, Curitiba, PR, Brazil

    R. S. C. Paredes

Authors
  1. A. G. M. Pukasiewicz
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  2. P. R. C. Alcover Jr.
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  3. A. R. Capra
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  4. R. S. C. Paredes
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Corresponding author

Correspondence to A. G. M. Pukasiewicz.

Additional information

This article is an invited paper selected from presentations at the 2013 International Thermal Spray Conference, held May 13-15, 2013, in Busan, South Korea, and has been expanded from the original presentation.

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Pukasiewicz, A.G.M., Alcover, P.R.C., Capra, A.R. et al. Influence of Plasma Remelting on the Microstructure and Cavitation Resistance of Arc-Sprayed Fe-Mn-Cr-Si Alloy. J Therm Spray Tech 23, 51–59 (2014). https://doi.org/10.1007/s11666-013-0001-1

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  • DOI: https://doi.org/10.1007/s11666-013-0001-1

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