Abstract
The present investigation aims at improving the wear resistance of AISI 304 stainless steel by laser surface alloying of AISI 304 stainless steel with WC+Co+NiCr (in the weight ratio of 20:40:40). Laser surface alloying was carried out by melting the surface using a 5kW continuous wave (CW) Nd:YAG laser at a beam diameter of 4mm, with the output power ranging from 1-3kW and scan speed from 0.005 m/s to 0.1 m/s by simultaneous feeding of precursor powder at a flow rate of 20mg/s using Ar shroud at a gas flow rate of 5 l/min. The effect of laser parameters on the microstructure, composition and phases was studied in detail. Finally, the wear and corrosion behavior of the laser surface alloyed stainless steel was evaluated and compared to that of as-received AISI 304 stainless steel. It was discovered that laser surface alloying leads to formation of a defect free and continuous alloyed zone. The microhardness of the alloyed zone was improved to 250-320 VHN as compared to 232 VHN of as-received substrate. The wear resistance property was improved significantly due to grain refinement and presence of WC,W2C, CoC as precipitates and Cr, Ni in solution. The optimum parameters for laser processing were derived.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
