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Formation mechanism of electrical discharge TiC-Fe composite coatings

Murray, J.W.; Algodi, Samer J.; Fay, Mike W.; Brown, Paul D.; Clare, Adam T.

Authors

Samer J. Algodi

Mike W. Fay

Paul D. Brown

Adam T. Clare



Abstract

Comparison of electric discharge (ED) processed single deposit and continuum TiC-Fe cermet coatings, formed from a sacrificial powder metallurgy TiC tool electrode at negative polarity, on 304 stainless steel, provided insight into the ED coating (EDC) formation mechanism. A deposit from a single spark event was dominated by TiC, phase separated from a ∼2 wt% Fe matrix, with strongly aligned grains and banded microstructure, indicative of solidification from the coating/substrate interface. Conversely, a continuum coating, subjected to ∼200 spark events per location, exhibited a more complex, banded microstructure, with a mixture of equiaxed and columnar TiC grains within a ∼30 wt% Fe-based matrix, along with some concentrations of carbon from the oil dielectric. It is considered that each sparking event remelts previously solidified coating material, with or without further TiC particle incorporation, leading to gradual TiC dilution and the development of a TiC-Fe composite coating with increasing levels of substrate material forming the matrix.

Citation

Murray, J., Algodi, S. J., Fay, M. W., Brown, P. D., & Clare, A. T. (in press). Formation mechanism of electrical discharge TiC-Fe composite coatings. Journal of Materials Processing Technology, 243, https://doi.org/10.1016/j.jmatprotec.2016.12.011

Journal Article Type Article
Acceptance Date Dec 15, 2016
Online Publication Date Dec 16, 2016
Deposit Date Jan 12, 2017
Publicly Available Date Jan 12, 2017
Journal Journal of Materials Processing Technology
Print ISSN 0924-0136
Electronic ISSN 0924-0136
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 243
DOI https://doi.org/10.1016/j.jmatprotec.2016.12.011
Keywords EDM, Electrical discharge coating, TEM, Crystal growth, Metal matrix composite, Titanium carbide
Public URL http://eprints.nottingham.ac.uk/id/eprint/39806
Publisher URL http://www.sciencedirect.com/science/article/pii/S092401361630454X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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