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    Influence of annealing on the microstructure and mechanical properties of Al/Ni-20Cr duplex coating system on steel substrate.

    Author: Ly Quoc Cuong, Nguyen Van Tuan, Le Thu Quy, Phung Thi To Hang. 

    Place posted: The 6th Asian Symposium on Advanced Materials: Chemistry, Physics & Biomedicine of Functional and Novel Materials (ASAM-6), paper VPS-5, pp.241-246, Hanoi, 9/2017.

    Post time: 2017

    Abstract: The electric arc thermal spray duplex Al/Ni-20Cr coating system on carbon steel substrate was heat-treated at different temperatures in a range of 400-600oC during annealing durations of 2-8 hours. The cross-sectional microstructure analysis shows a significant reduction of the coating porosity after the heat treatment. The microhardness measurement reveals interdiffusion between the Ni-20Cr and Al layers, as well as between the Al layer and steel substrate. The newly formed intemetallic compounds are characterized by high values of microhardness of 800-850 HV, that brought a positive effect to increase the wear resistance and to reduce the friction coefficient of the coating system.

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