THE EFFECT OF THE AMORPHOUS CONTENT OF LASER CLADDING Ni-Nb-Zr/CaF2 ON MICROSTRUCTURE AND PROPERTIES
Journal Title: Journal of Machine Construction and Maintenance - Year 2018, Vol 111, Issue 4
Abstract
Ni-Nb-Zr/CaF2 amorphous coating was prepared on the surface of SA283GRA steel by adopting a high-power laser cladding system. The results show that the Ni-Nb-Zr/CaF2 coating obtained by laser cladding has a good metallurgical bonding with the matrix of SA283GRA and the amorphous phase was obtained. The different amorphous content was obtained with varied laser power. With the increase of laser power, the dilution rate of the coating gradually increases, the amorphous phase content in the cladding coating decreased gradually, and crystallization near the substrate is significant in the laser coating. As the cladding coating is far from the substrate, the content of amorphous phase increases gradually, and the cladding coating has high thermal stability. The hardness of the Ni-Nb-Zr/CaF2 amorphous coating prepared by a laser power of 4 kW is up to the highest value of 890 HV, which is about 4.7 times that of the base material. The electrochemical corrosion results show that the corrosion resistance of the amorphous layer is better than that of the substrate in NaCl solution with 3.5% corrosive medium. The Ni-Nb-Zr/CaF2 laser coating has a relatively strong amorphous forming ability.
Authors and Affiliations
Xiubing Liang, Yanhai Cheng, Xiaoqian Cheng, Yichao Jiang, Tadeusz KuLiK, Jarosław Ferenc
Keywords
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