重熔时间对WC/镍基合金复合熔覆层微观组织的影响

摘要

为提高机械零部件表面的耐磨性能,运用氧-乙炔火焰喷焊技术制备了WC/镍基合金复合熔覆层,分析了重熔时间对复合熔覆层微观组织的影响.结果表明,经过恰当时间重熔的复合熔覆层组织更加致密,并产生了Cr23 C6新物相,进一步增强了熔覆层性能;但若重熔时间过长,熔覆层中的WC会发生沉积并分解产生硬脆相W2C,反而降低了熔覆层性能.%In order to improve the wear resistance on the surface of the mechanical parts,WC/Ni-based alloy composite cladding layers are prepared by oxygen-acetylene flame spray welding,and the effect of remelting time on the microstructure is observed.The results show that the microscopic structure of the coating after flame remelting is denser.The new phase,Cr23C6,makes the performance of the coating be significantly improved.But if the remelting time is too long,the performance of the coating decreases,WC particles deposit and are decomposed to W2C,a hard and brittle phase.