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45 Steel is an important structural carbon steel and significantly influences human life and social development. Ni-based composite coatings are widely used in 45 steel workpieces to improve surface properties and expand their applications.
In this study, the plasma cladding technique was employed to produce Ni-based cladding with different WC contents on 45 steel surfaces. The microstructure, phase structure, microhardness, residual stress, and corrosion resistance of Ni-based cladding coatings were investigated.
The results showed that the coatings were made up mostly of Ni3Fe, Cr23C6, Cr7C3, WC, and W2C phases.
The microhardness of the Ni-based alloy coatings was greatly increased due to the presence of the WC hard phase on the Ni matrix. The highest microhardness was found to be more than triple the microhardness of the substrate with the addition of 60% WC. In addition, the largest residual stress at the center of the cladding channel was more than five times higher than the substrate-affected zone. The corrosion resistance of 45 steel-containing Ni-based coatings increased in acidic, neutral, and alkaline environments due to the formation of passivation films.
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