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分别用半导体激光与超音速火焰喷涂设备在45钢基体上制备Ni60合金涂层。用扫描电镜、金相显微镜、XRD对熔覆层进行微观组织和成分的研究。并对熔覆层的显微硬度和耐磨性进行分析。结果表明:激光熔覆层质量良好、无缺陷,熔敷层与基体之间形成良好的冶金结合;超音速火焰喷涂的熔覆层与基体为机械结合,结合力相对较弱。激光熔覆层内组织致密、晶粒细小且析出了C化物与Cr化物,这使激光熔敷层的硬度与耐磨性高于超音速火焰喷涂。
Ni60 alloy coatings were prepared on 45 steel substrates by using semiconductor laser and supersonic flame spraying equipment respectively. The microstructure and composition of the cladding layer were investigated by scanning electron microscopy, optical microscope and XRD. The microhardness and wear resistance of the cladding were analyzed. The results show that the laser cladding layer is of good quality and defect-free, and the metallurgical bond between the cladding layer and the substrate is good. The cladding layer of supersonic flame spraying is mechanically bonded with the substrate, and the bonding strength is relatively weak. The laser cladding layer has compact structure, small grains and precipitated C and Cr compounds, which makes the hardness and wear resistance of laser cladding layer higher than that of supersonic flame spraying.