Abstract
The Ni-65wt%WC cladding layers were prepared on the surface of Q235 using laser cladding technology, in which the effect of heat treatment on microstructure and tribocorrosion performance was investigated. The results showed that the coating is mainly consisted of Ni, WC, and W2C, and a significant diffusion phenomenon is formed between the interfaces of WC/Ni matrix, benefited for the improvement of bonding layer between WC/Ni-based matrixes. Meanwhile, the crystallization of WC particles after heat treatment was more obvious than untreatment; the Ni matrix grain size was also grown remarkable, leading to the lower hardness and weaker plastic deformation resistance of Ni-65wt%WC coating. And the erosion results showed that the wear rate of coating gradually decreased with heat treatment temperature increasing, while brittle WC was not suitable for high impact wear conditions. Furthermore, with the increase of heat treatment temperature, the reciprocating wear performance showed that the friction coefficient and wear rate of Ni-65wt%WC coating decreased. And the friction coefficient and wear rate of the coating (700°C) in 3.5% NaCl solution were 0.15 and 4.82 × 10−8 mm3·N−1·m−1, respectively. Therefore, the comprehensive comparison showed that Ni-65WC coating had better performance in low impact reciprocating testing under corrosion environment, and heat treatment was helpful to further improve the tribocorrosion performance of laser cladding Ni-65wt%WC coating.
Highlights
Q235 steel is the most commonly used metal material, which is widely used in the automobile industry, machinery manufacturing, and chemical industry [1,2,3]
This study provides a reference for improving the practical application of laser cladding to prepare composite wear-resistant coatings
The results showed that the erosion induced the decreases of W and C contents and increase of Ni, Si, and Cu on the erosion area of coating with the heat temperature, which can be owned by the strong combination between WC and Ni matrixes
Summary
Q235 steel is the most commonly used metal material, which is widely used in the automobile industry, machinery manufacturing, and chemical industry [1,2,3]. Low hardness and poor wear resistance limit its application in key friction movement parts. To solve these problems, researchers have prepared high hardness, antiwear, and corrosion-resistant coating on the surface of Q235 steel by laser cladding technology. Studying on the effect of postheat treatment to the microstructure, friction and wear properties of laser cladding composite coatings were less. Tungsten carbide has attracted much attention due to good chemical stability, thermal stability, and high hardness in the laser cladding wear-resistant composite coating in recent years. Laser cladding technology is used to prepare Ni-65WC composite wear-resistant coating on the surface of Q235 steel, and the coating is postheat treated to reduce residual stress. This study provides a reference for improving the practical application of laser cladding to prepare composite wear-resistant coatings
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