Laser Surface Modification of a Laser Clad Ceramics Reinforced Multiphase Coating on TA2 Titanium Alloy
Z. Zhang, J-N. LI, S-Z. Zhang and X-G. Sun
A Stellite 6/B4C-(Co-coated WC) reinforced coating were prepared by mean of laser cladding on the TA2 titanium alloy. The phase and microstructure of this Stellite 6/B4C-(Co-coated WC) reinforced coating was analysed in detail. The results showed that amounts of the reinforced phases were produced and a good metallurgical bond was formed between the coating and the TA2 titanium alloy substrate. The additions of B4C and Co-coated WC refined the grain sizes and produced a large amount of fine ceramics in this coating, improving the TA2 titanium alloy surface performance. The microhardness of the Stellite 6/B4C-(Co-coated WC) reinforced coating was enhanced due to the existence of the nanocrystalline phases and amorphous phases. The grain sizes of this laser clad Stellite 6/B4C-(Co-coated WC) reinforced coatings was further refined after a laser remelting which enhanced the microhardness.
Keywords: Fibre laser, TA2 titanium alloy, Stellite 6, B4C-(Co-coated WC), ceramics reinforced coating, laser cladding, laser remelting, surface modification, microstructure, microhardness