基于工业合金激光熔覆制备Fe基非晶涂层

以FeCoCrMoCBY块体合金为熔覆材料,采用激光熔覆在低碳钢表面制备非晶涂层,探讨不同激光功率对涂层成形及组织的影响,通过显微硬度仪、电化学工作站测试涂层显微硬度及耐腐蚀性能。研究结果表明,其他参数不变,激光功率为17.6~20.8 W时,涂层成形良好,与基材呈典型冶金结合。随激光功率增加,涂层稀释率升高,裂纹倾向增大,非晶化程度降低。激光功率为17.6 W时,涂层主要由非晶组成,稀释率低于24.2%,结构致密,包括热影响区、熔合区和熔覆区;涂层平均显微硬度为1 330HV,约高于基材9倍,在3.5%NaCl溶液中的耐腐蚀性能明显优于316L不锈钢。

Fabrication of Amorphous Coating by Laser Cladding Using Industrial-grade Fe-based Alloy

High-density amorphous coating with FeCoCrMoCBY bulk alloy as cladding material was fabricated by laser cladding on the surface of mild steel. The effect of different laser power on formation and microstructure of the coatings was discussed. The microhardness and corrosion resistance of the coating were tested by microhardness tester and electrochemical work station. The results show that the coatings of good formation and typically metallurgical bonding with the substrate is obtained,when laser power are changing from 17.6 W to 20.8 W with other parameter fixed. With the increase of laser power, the dilution rates go up, the tendency of cracks rise and the degree of amorphization decrease in the coating. When laser power is 17.6 W, the coating is mainly amorphous, the dilution rate is less than 24.2%, and the structure of the coating is dense, which includes heat affected zone, bon-ding zone and cladding zone. Moreover, the average microhardness of the coating is 1 330HV, which is about 9 times higher than the substrate. And the coating has more excellent corrosion resistance than 316L stainless steel in the 3.5% NaCl solution.