Influence of Treatment Sequence on Tribological Performance of Duplex Surface-Treated AISI 1045 Steel
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The surface of AISI 1045 steel specimens was modified via two duplex surface treatments of (i) titanium diffusion coating followed by plasma nitriding (Ti–PN) and (ii) plasma nitriding followed by titanium diffusion coating (PN–Ti). A comparative study on the microstructure and wear properties of the fabricated TiN coatings was conducted. A scanning electron microscope equipped with energy-dispersive X-ray spectroscopy, X-ray diffractometer (XRD), and pin-on-disk wear test was utilized to evaluate the microstructures, phases, and wear properties of the coatings. XRD patterns of duplex-treated specimens illustrated that the modified layer consisted of nitride and carbo-nitride phases such as TiN and TiC0.7N0.3. The results also showed that Ti–PN treatment led to a low friction coefficient and the lowest wear factors, as compared with the PN–Ti treatment. Oxidation and mild fatigue fracture wear were found to be the main wear mechanism of the Ti–PN coating. The wear mechanism in the PN–Ti specimen involved a higher oxidative wear regime followed by plastic deformation wear regimes.
KeywordsDuplex surface treatment TiN coating Plasma nitriding Titanium diffusion coating Tribological performance
The authors would like to thank Semnan University for financial support of this research. The first author also thanks Plasma Pajouh Co. and Mr. A. Ziyari for his assistance in the experiments.
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