Comparative Study of Self-lubricating Coatings Microstructure on TC4 Alloy Surface Prepared by Single-pass Laser Cladding and Multitrack Laser Cladding
ZHANG Tiangang1, SUN Ronglu1,2
1 School of Mechanical Engineering,Tianjin Polytechnic University, Tianjin 300387; 2 Tianjin Area Major Laboratory of Advanced Mechatronics Equipment Technology, Tianjin 300387
Abstract: Ni60/20%WS2 powder was precast on surface of TC4 alloy, and self-lubricating coating was then prepared by respectively adopting single-pass laser and multitrack laser cladding technology. The result showed that multitrack laser cladding was more likely to produce crack, and the cracking direction had a certain angle with the scanning direction. The main ingredients of multitrack laser-clad coating and single-pass laser-clad coating were the same, all produced lubricating phase and hard phase. But the former had lower distribution density of lubricating phase and hard phase, and coarser alloy grains. The microhardness of multitrack laser-clad and single-pass laser-clad coatings was 800-1 000HV0.5 and 950-1 150HV0.5 respectively. The grain refinement strengthening effect and higher hard phase concentration of single-pass laser-clad coating results in a relatively high microhardness compared to multitrack laser-clad coating.
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2017, Vol. 31 
