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Influence of CrC addition in Ni-Cr-Si-B flame sprayed coatings on microstructure, microhardness and wear behaviour

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Abstract

In the present paper the influence of the addition of chromium carbide (CrC) particles on the microstructure, microhardness and abrasive wear behaviour of flame sprayed Ni-Cr-Si-B coatings deposited on low carbon steel substrate has been reported. Wear behaviour of the coatings was evaluated with a pin-on-block wear system against SiC abrasive medium (120 & 600 grades) over a range of normal load (5–20 N). It was observed that the wear behaviour is governed by the material related parameters (microstructure, microhardness of coating) and test parameters (abrasive grit size and normal load). The addition of CrC reduces the wear rate three to eightfold. Wear resistance was greater against coarse abrasives at high loads than against fine abrasives. Heat treatment of both unmodified (1004) and modified powder (1004-10%CrC, 1004-20%CrC) coatings deteriorated the abrasive wear resistance. SEM study of wear surfaces showed that wear of the coatings largely takes place by groove formation, plowing and scoring. Electron probe micro analysis (EPMA) of the coating was carried out for composition and phase analysis.

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Authors and Affiliations

  1. Department of Mechanical & Industrial Engineering, Indian Institute of Technology, Roorkee, 247667, India

    S. Harsha, D. K. Dwivedi & A. Agarwal

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  1. S. Harsha
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  2. D. K. Dwivedi
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  3. A. Agarwal
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Correspondence to D. K. Dwivedi.

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Harsha, S., Dwivedi, D.K. & Agarwal, A. Influence of CrC addition in Ni-Cr-Si-B flame sprayed coatings on microstructure, microhardness and wear behaviour. Int J Adv Manuf Technol 38, 93–101 (2008). https://doi.org/10.1007/s00170-007-1072-2

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  • DOI: https://doi.org/10.1007/s00170-007-1072-2

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