Effect of thermal degradation on the properties and wear behavior of Cr−V−C composite coatings grown on ductile iron

The thermal fatigue behavior of chromium vanadium carbide (Cr − V − C) coatings and the wear of the coatings after thermal fatigue cycling was studied. The Cr − V − C coatings were grown on the surface of a ductile iron using thermo-reactive diffusion (TRD) and subjected to thermal fatigue in the te...

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Bibliographic Details
Published in:Surface & coatings technology 2021-08, Vol.419, p.127305, Article 127305
Main Authors: Günen, Ali, Kanca, Erdoğan, Karakaş, Mustafa Serdar, Gök, Mustafa Sabri, Kalkandelen, Müge, Kurt, Bülent, Çetin, Melik, Karahan, Ismail Hakki
Format: Article
Language:English
Subjects:
Chromium
Coatings
Dissolution
Ductile iron
Fatigue tests
Flaking
Graphical user interface
Graphite
Industrial applications
Microhardness
Nodular graphitic structure
Nodular iron
Thermal cycling
Thermal degradation
Thermal fatigue
Thermal resistance
TRD treatment
Vanadium carbide
Wear
Wear resistance
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Summary:The thermal fatigue behavior of chromium vanadium carbide (Cr − V − C) coatings and the wear of the coatings after thermal fatigue cycling was studied. The Cr − V − C coatings were grown on the surface of a ductile iron using thermo-reactive diffusion (TRD) and subjected to thermal fatigue in the temperature range of 25 to 750 °C for up to 500 cycles. Characterizations were made using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, microhardness measurements and wear tests. The Cr − V − C coated samples displayed superior thermal fatigue and wear resistance compared to the untreated ductile iron, mainly due to the dissolution of graphite nodules in the vicinity of the surface during TRD. The dissolution of graphite reduced the possibility of failure initiating from graphite nodules and graphite-matrix interfaces. Increasing the number of cycles resulted in increased flaking and decreased wear resistance in both the Cr − V − C coatings as well as the untreated ductile iron. Although much of the Cr − V − C coating was lost (due to flaking) after thermal cycling, the absence of graphite near the surface still provided improved resistance to wear in the TRD-treated samples. The results of this study indicate that TRD coatings hold great promise for use in the industrial applications. •Failure and wear behavior of the thermally cycled Cr-V-C coatings were investigated.•The Cr-V-C coating improved thermal fatigue and wear resistance•Graphite nodules serve as initiation sites for microcracking in ductile iron.•The dissolution of the graphite nodules helped improve thermal fatigue and wear resistance•Cr-V-C coatings hold great promise for use in industrial applications.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2021.127305