Research on the Microstructure and Wear Resistance of M_(80)S(20) Alloy Coating Produced by Flame Spray, Flame Spray Welding and Laser Remelting

This paper deals with the microstructure and wear resistance of the coating which is produced by flame spray, flame spray welding and laser remelting. The (Fe, Cr, Ni, W, Mo)80 (B, Si, C)20 iron-base amorphous self-melting alloy powder is applied on to the surface of 20 steel. The results show that the microstructures of these three kinds of coating are different from those of the matrix (20 steel). The wear resistance of the flame spray coating is 4. 9 times that of the matrix. This is caused by the existance of hard noncrystal microparticals. The wear resistance of the coating by flame spray welding is 6. 3 times that of the matrix. The reason is that the fine crystal grains can be formed and the solution strengthening, dispersion hardening can be induced by these alloy elements. The resistance of the laser remelt coating is 8. 8 times that of the matrix. This is due to the solution strengthening, dispersion hardening and the existence of very hard dendritic crystal, eutectic and martensite in the microstructure.