Effect of laser power on microstructure and corrosion resistance of FeCoNiCrMo high-entropy alloy/graphene oxide composite coating

doi:10.13251/j.issn.0254-6051.2022.04.043

Abstract

Abstract: FeCoNiCrMo high-entropy alloy/graphene oxide composite coatings were prepared on 17-4PH stainless steel substrate by laser cladding process with laser power of 1600, 1800, 2000 and 2200 W, and the microstructure, Composition of phase, microhardness and corrosion resistance of the coatings were investigated. The results indicate that the phase composition include solid solution with BCC structure and intermetallic compounds such as M₂₃C₆, M₇C₃ and Co₂C. With the increase of laser power, the number of dendrites formed by intermetallic compounds increases, the microhardness of the coating increases, and the corrosion resistance first increases and then decreases. When the laser power reaches 2200 W, the coating obtains the highest microhardness and the optimum corrosion resistance, the corrosion potential is 0.631 V, which is about 2.66 times that of the substrate, and the corrosion current density is 0.319 μA/cm². So it is found that the laser power is a significant factor affecting the microstructure and corrosion resistance of FeCoNiCrMo high entropy alloy/GO composite coating, and the increase of laser power promotes the growth of carbide precipitates in the coating, which is conducive to improving the hardness and corrosion resistance of the coating. However, excessive intermetallic compounds generated under high laser power increase the crack sensitivity of the coating, resulting in obvious cracks in the coating, and reducing the corrosion resistance of the coating.

Key words: laser cladding, high entropy alloys, laser power, graphene oxide, corrosion resistance

CLC Number:

TG178

Zhao Zishuo, Wu Meiping, Miao Xiaojin, Cui Chen, Gong Yuling. Effect of laser power on microstructure and corrosion resistance of FeCoNiCrMo high-entropy alloy/graphene oxide composite coating[J]. Heat Treatment of Metals, 2022, 47(4): 251-257.

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