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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance
Surface and Coatings Technology, Volume 206, No. 15, Year 2012
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Description
In the present study, laser surface alloying of aluminium with WC+Co+NiCr (in the ratio of 70:15:15) has been conducted using a 5kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003m), with the output power ranging from 3 to 3.5kW and scan speed from 0.012m/s to 0.04m/s by simultaneous feeding of precursor powder (at a flow rate of 1×10 -5kg/s) and using He shroud at a gas flow rate of 3×10 -6m 3/s. The effect of laser power and scan speed on the characteristics (microstructures, phases and composition) and properties (wear and corrosion resistance) of the surface alloyed layer have been investigated in details. Laser surface alloying leads to development of fine grained aluminium with the dispersion of WC, W 2C, Al 4C 3, Al 9Co 2, Al 3Ni, Cr 23C 6, and Co 6W 6C. The microhardness of the alloyed zone is significantly improved to a maximum value of 650 VHN as compared to 22 VHN of the as-received aluminium substrate. The mechanism of microhardness enhancement has been established. The fretting wear behavior of the alloyed zone was evaluated against WC by Ball-on-disc wear testing unit and the mechanism of wear was established. © 2012 Elsevier B.V.
Authors & Co-Authors
Nath, Subhasisa
India, Kharagpur
Indian Institute of Technology Kharagpur
Pityana, Sisa Lesley
South Africa, Pretoria
The Council for Scientific and Industrial Research
Dutta-Majumdar, Jyotsna
India, Kharagpur
Indian Institute of Technology Kharagpur
Statistics
Citations: 64
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1016/j.surfcoat.2012.01.038
ISSN:
02578972