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Plasma transferred arc surface modification of a low carbon steel

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Abstract

The potential of Plasma Transferred Arc (PTA) hardfacing goes beyond the surface welding of superalloys. This work evaluated low carbon steel surface modification by PTA deposition of fine WCoC carbides, and mixtures of Fe powders and 5–35 wt% carbides. Characterization included visual inspection, optical and scanning electron microscopy, X-ray diffraction and microhardness profiles. PTA processing allowed for the dissolution of carbides confirmed by X-ray diffraction, leading to homogeneous microstructures. Microstructures varied from a Widmanstätten morphology to a typical dendritic solidification structure upon the WCoC content. Surface soundness depended on powder preparation and composition. Sound surfaces exhibiting hardness up to 700 Hv were obtained for the 35 wt% WCoC powder mixture.

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Acknowledgements

Authors would like to thank to Federal University of Paraná (UFPR), Materials Engineering Pos-Graduation program (PIPE). Special thanks are due to Mr Sérgio Simões from Deloro Stellite, to Mr Sérgio Santos from Robert Bosch for MEV support and to Dr Irineu Mazzaro for X-ray diffraction analysis.

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  1. Mechanical Engineering Department, Universidade Federal do Paraná/Federal University of Paraná, Centro Politécnico Cx Postal 19011, Jardim das Américas, Curitiba, Paraná, 81 531 990, Brazil

    João J. Tigrinho & Ana Sofia C. M. d’Oliveira

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  1. João J. Tigrinho
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  2. Ana Sofia C. M. d’Oliveira
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Correspondence to Ana Sofia C. M. d’Oliveira.

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Tigrinho, J.J., d’Oliveira, A.S.C.M. Plasma transferred arc surface modification of a low carbon steel. J Mater Sci 42, 7554–7557 (2007). https://doi.org/10.1007/s10853-007-1615-9

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  • DOI: https://doi.org/10.1007/s10853-007-1615-9

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