Microstructure and wear resistance of TaC reinforced Ni-based coating by laser cladding

The in situ synthesized TaC particulate reinforced Ni-based composite coating was fabricated on a mild steel by laser cladding of powder mixture of Ni60 alloy powder with (Ta 2O 5 + C)-doping. The microstructure and wear resistance of the TaC/Ni60 composite coating were investigated. It is shown tha...

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Bibliographic Details
Published in:Surface & coatings technology 2008-02, Vol.202 (10), p.1918-1922
Main Authors: Chao, Ming-ju, Wang, Wen-li, Liang, Er-jun, Ouyang, Dongxun
Format: Article
Language:English
Subjects:
Applied sciences
Contact of materials. Friction. Wear
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
In situ synthesis
Laser cladding
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic coatings
Metals. Metallurgy
Microstructure
Physics
Production techniques
Surface treatment
Surface treatments
TaC
Wear resistance
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Summary:The in situ synthesized TaC particulate reinforced Ni-based composite coating was fabricated on a mild steel by laser cladding of powder mixture of Ni60 alloy powder with (Ta 2O 5 + C)-doping. The microstructure and wear resistance of the TaC/Ni60 composite coating were investigated. It is shown that the coating is bonded metallurgically to the substrate and has a homogeneous fine microstructure containing both approximate cubic TaC particle and acicular chromium carbide uniformly dispersed in the dual phase matrix of γ(Ni) solid solution and eutectic of Cr 3C 2, Fe 2B with γ(Ni). Compared to a Ni60 coating, the hardness of the TaC/Ni60 composite coating was enhanced by a factor of 1.38, could achieve a Vicker microhardness of Hv 0.31100. And the wear rate in a block on ring test against hardened steel was reduced by a factor of five. This is attributed to the presence of in situ synthesized TaC particles and their well distribution in the coating.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2007.08.021