A comparative study on microstructure evolution and wear resistance of different-sized tungsten carbide modified Fe-based laser cladding coatings. (March 2022)

• Record Type: Journal Article
• Authors: Li, Jianfeng; Zhu, Zhencai; Peng, Yuxing; Shen, Gang
• Is Part Of: Optics & laser technology. Volume 147(2022)
• Publication Date: 2022-03
• Subjects: Different-sized WC -- Laser cladding -- Microstructure evolutions -- Wear resistance; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2021.107672
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Change in the particle size of WC influences the microstructure evolution of coatings. Small-sized WC could refine the microstructure of coatings, while large-sized WC could not. Strengthening effect of small-sized WC on the coatings was much better than large-sized WC. Abstract: In the present study, Fe-based laser cladding coatings with different-sized WC particles were fabricated on the surface of 16Mn steel, aiming at exploring the effect of different-sized WC addition on microstructure evolutions, microhardness and wear resistance of composite coatings. Results showed that for composite coatings, a change in particle size of WC had a negligible effect on phase constituents, but it was found effective in influencing the microstructure, microhardness, and wear resistance. The main phases of composite coatings were mainly composed of α-Fe, γ-(Fe, Ni), WC and M23 C6 (M: Cr, W, Fe). Small-sized WC played a positive effect in forming homogeneous and finer microstructure in composite coating, while the effect of large-sized WC was the opposite. The microstructure of small-sized WC-contained coating only contained dendritic α-Fe matrix and inter-dendritic composite carbides of WC + M23 C6 . The microstructure of large-sized WC-contained coating in the centre and edges was entirely different. The microstructure in the centre consisted of dendritic α-Fe matrix and inter-dendritic fine lamellar eutectics of α-Fe + M23 C6 . The microstructure in the edges consisted of dendritic α-Fe matrix and inter-dendritic carbides of M23 C6 . Besides, the strengthening effect of small-sized WC was much better than that of large-sized WC.