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Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

Zhu Weixin
Zhu Weixin
 e 
Kong Dejun
Kong Dejun
   | 22 dic 2021
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Pubblicato online: 22 dic 2021
Pagine: 395 - 409
Ricevuto: 04 giu 2021
Accettato: 17 nov 2021
DOI: https://doi.org/10.2478/msp-2021-0032
Parole chiave
© 2021 Zhu Weixin et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Sketch of friction-wear test for NiMo-TiC coatings.
Sketch of friction-wear test for NiMo-TiC coatings.

Fig. 2

Microstructure of NiMo-TiC coating with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.
Microstructure of NiMo-TiC coating with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.

Fig. 3

Binary images of NiMo-TiC coatings with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.
Binary images of NiMo-TiC coatings with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.

Fig. 4

XRD analysis of NiMo-TiC mixed powders and coatings with different TiC mass fractions: (a) NiMo-TiC mixed powders; (b) NiMo-TiC coatings. XRD, X-ray diffraction.
XRD analysis of NiMo-TiC mixed powders and coatings with different TiC mass fractions: (a) NiMo-TiC mixed powders; (b) NiMo-TiC coatings. XRD, X-ray diffraction.

Fig. 5

Microstructure of the NiMo-TiC coating cross sections with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.
Microstructure of the NiMo-TiC coating cross sections with different TiC mass fractions: (a) NiMo-5%TiC coating; (b) NiMo-15%TiC coating; (c) NiMo-25%TiC coating.

Fig. 6

Hardness of NiMo-TiC coating surfaces and cross sections with different TiC mass fractions: (a) surface hardness; (b) cross section hardness.
Hardness of NiMo-TiC coating surfaces and cross sections with different TiC mass fractions: (a) surface hardness; (b) cross section hardness.

Fig. 7

COFs versus wear time of the substrate and the NiMo-TiC coatings with different TiC mass fractions under grease-lubrication and dry-friction conditions: (a) under grease-lubrication condition; (b) under dry-friction condition.
COFs versus wear time of the substrate and the NiMo-TiC coatings with different TiC mass fractions under grease-lubrication and dry-friction conditions: (a) under grease-lubrication condition; (b) under dry-friction condition.

Fig. 8

Profiles of worn tracks and the wear rates of substrate and NiMo-TiC coatings with different TiC mass fractions under grease-lubrication condition: (a) profiles of worn tracks; (b) wear rates.
Profiles of worn tracks and the wear rates of substrate and NiMo-TiC coatings with different TiC mass fractions under grease-lubrication condition: (a) profiles of worn tracks; (b) wear rates.

Fig. 9

Widths of the worn tracks on the substrate and on NiMo-TiC coating with different TiC mass fractions: (a) on substrate; (b) on NiMo-5%TiC coating; (c) on NiMo-15%TiC coating; (d) on NiMo-25%TiC coating.
Widths of the worn tracks on the substrate and on NiMo-TiC coating with different TiC mass fractions: (a) on substrate; (b) on NiMo-5%TiC coating; (c) on NiMo-15%TiC coating; (d) on NiMo-25%TiC coating.

Fig. 10

Images of the worn tracks on tribo-pairs against the substrate and the NiMo-TiC coatings with different TiC mass fractions: (a) against substrate; (b) against NiMo-5%TiC coating; (c) against NiMo-15%TiC coating; (d) against NiMo-25%TiC coating.
Images of the worn tracks on tribo-pairs against the substrate and the NiMo-TiC coatings with different TiC mass fractions: (a) against substrate; (b) against NiMo-5%TiC coating; (c) against NiMo-15%TiC coating; (d) against NiMo-25%TiC coating.

Fig. 11

Morphologies of the worn tracks on the substrate and on the NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC coating; (d) NiMo-25%TiC coating.
Morphologies of the worn tracks on the substrate and on the NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC coating; (d) NiMo-25%TiC coating.

Fig. 12

EDS line scan analysis of the worn tracks on NiMo-TiC coating with different TiC mass fractions: (a) on substrate; (b) on NiMo-5%TiC coating; (c) on NiMo-15%TiC coating; (d) on NiMo-25%TiC coating.
EDS line scan analysis of the worn tracks on NiMo-TiC coating with different TiC mass fractions: (a) on substrate; (b) on NiMo-5%TiC coating; (c) on NiMo-15%TiC coating; (d) on NiMo-25%TiC coating.

Fig. 13

EDS analysis of the worn tracks on the substrate and the NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC coating; (d) NiMo-25%TiC coating.
EDS analysis of the worn tracks on the substrate and the NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC coating; (d) NiMo-25%TiC coating.

Fig. 14

Wear models of substrate and NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC and NiMo-25%TiC coatings.
Wear models of substrate and NiMo-TiC coatings with different TiC mass fractions: (a) substrate; (b) NiMo-5%TiC coating; (c) NiMo-15%TiC and NiMo-25%TiC coatings.
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