Phase evolution and wear resistance of in situ synthesized V8C7 particles reinforced Fe-based coating by laser cladding. (September 2018)

• Record Type: Journal Article
• Authors: Wang, C.; Zhang, S.; Zhang, C.H.; Wu, C.L.; Zhang, J.B.; Abdullah, Adil O.
• Is Part Of: Optics & laser technology. Volume 105(2018)
• Page Start: 58
• Page End: 65
• Publication Date: 2018-09
• Subjects: Laser cladding -- In situ synthesis -- Fe-based coating -- V8C7 -- Wear resistance; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2018.02.019
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Fe-based composite coating with V8 C7 particles was fabricated by laser cladding. Fine V8 C7 particles were successfully in situ synthesized in the composite coating. The formation mechanism of V8 C7 was discussed by thermomechanical analysis. The hardness and relative wear resistance of the coating were obviously improved. Abstract: In situ synthesized V8 C7 reinforced Fe-based composite coating was successfully prepared on 35CrMo steel by laser cladding, aiming at improving the wear resistance. Constituent phases, microstructure, microhardness and wear resistance of the coating were investigated using XRD, SEM, microhardness tester and friction-wear tester. The results showed that the obtained coating was uniform and dense with no pores or cracks appearing, in addition to satisfied metallurgical bonding to the substrate. The coating was mainly composed of α-Fe, V8 C7, Cr7 C3, Fe3 C and Mo2 C phase. Fine V8 C7 reinforced particles were in situ synthesized during the melting process. The shape of V8 C7 particles changed from sphere to irregular blocks as a distance from the interface, which was due to the crash and binding of V8 C7 particles with each other. The microhardness of coating was 775 HV0.3, which was about 4 times greater than the substrate. The wear resistance of the coating was significantly improved as indicated by the higher relative wear resistance.