DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5707

Title: Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance
Authors: Nath, S
Pityana, S
Majumdar, JD
Keywords: Laser surface alloying
Aluminium
Microstructure
Microhardness
Coatings technology
Issue Date: Mar-2012
Publisher: Elsevier
Citation: Nath, 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.2012.01.038
Series/Report no.: Workflow;8269
Abstract: 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.
Description: Copyright: 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.2012.01.038
URI: http://www.sciencedirect.com/science/article/pii/S0257897212000540
http://hdl.handle.net/10204/5707
ISSN: 0257-8972
Appears in Collections:Laser materials processing
Manufacturing science and technology
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Pityana_2012.pdf2.63 MBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback