Nath, SPityana, Sisa LMajumdar, JD2012-04-022012-04-022012-03Nath, S, Pityana, S and Majumdar, JD. 2012. Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance. Surface & Coatings Technology, vol. 206(15), pp 3333-3341, doi: 10.1016/j.surfcoat.2012.01.0380257-8972http://www.sciencedirect.com/science/article/pii/S0257897212000540http://hdl.handle.net/10204/5707Copyright: 2012 Elsevier. This is the post-print version of the work. The definitive version is published in Surface & Coatings Technology, vol. 206(15), pp 3333-3341, doi: 10.1016/j.surfcoat.2012.01.038In the present study, laser surfac ealloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 to 3.5 kW and scan speed from 0.012 m/s to 0.04 m/s by simultaneous feeding of precursor powder (at a flow rate of 1 × 10- 5 kg/s) and using He shroud at a gas flow rate of 3 × 10- 6 m3/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, W2C, Al4C3, Al9Co2, Al3Ni, Cr23C6, and Co6W6C. 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.enLaser surface alloyingAluminiumMicrostructureMicrohardnessCoatings technologyArticleNath, S., Pityana, S. L., & Majumdar, J. (2012). Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance. http://hdl.handle.net/10204/5707Nath, S, Sisa L Pityana, and JD Majumdar "Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance." (2012) http://hdl.handle.net/10204/5707Nath S, Pityana SL, Majumdar J. Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance. 2012; http://hdl.handle.net/10204/5707.TY - Article AU - Nath, S AU - Pityana, Sisa L AU - Majumdar, JD AB - In the present study, laser surfac ealloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 to 3.5 kW and scan speed from 0.012 m/s to 0.04 m/s by simultaneous feeding of precursor powder (at a flow rate of 1 × 10- 5 kg/s) and using He shroud at a gas flow rate of 3 × 10- 6 m3/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, W2C, Al4C3, Al9Co2, Al3Ni, Cr23C6, and Co6W6C. 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. DA - 2012-03 DB - ResearchSpace DP - CSIR KW - Laser surface alloying KW - Aluminium KW - Microstructure KW - Microhardness KW - Coatings technology LK - https://researchspace.csir.co.za PY - 2012 SM - 0257-8972 T1 - Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance TI - Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance UR - http://hdl.handle.net/10204/5707 ER -