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.

中文翻译：

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热处理对激光熔覆Ni-65 WC涂层组织和摩擦腐蚀性能的影响

采用激光熔覆技术在Q235表面制备Ni-65wt%WC熔覆层，研究热处理对微观结构和摩擦腐蚀性能的影响。结果表明，涂​​层主要由Ni、WC和W2C组成，WC/Ni基体界面之间形成明显的扩散现象，有利于WC/Ni基基体之间结合层的改善。同时，热处理后WC颗粒的结晶比未处理更明显；Ni基体晶粒尺寸也显着增大，导致Ni-65wt%WC涂层硬度较低，抗塑性变形能力较弱。侵蚀结果表明涂层的磨损率随着热处理温度的升高而逐渐降低，而脆性 WC 不适合高冲击磨损条件。此外，随着热处理温度的升高，往复磨损性能表明Ni-65wt%WC涂层的摩擦系数和磨损率降低。涂层（700℃）在 3.5% NaCl 溶液中的摩擦系数和磨损率分别为 0.15 和 4.82 × 10-8 mm3·N-1·m-1。因此，综合比较表明Ni-65WC涂层在腐蚀环境下的低冲击往复试验中具有更好的性能，热处理有助于进一步提高激光熔覆Ni-65wt%WC涂层的摩擦腐蚀性能。往复磨损性能表明Ni-65wt%WC涂层的摩擦系数和磨损率降低。涂层（700℃）在 3.5% NaCl 溶液中的摩擦系数和磨损率分别为 0.15 和 4.82 × 10-8 mm3·N-1·m-1。因此，综合比较表明Ni-65WC涂层在腐蚀环境下的低冲击往复试验中具有更好的性能，热处理有助于进一步提高激光熔覆Ni-65wt%WC涂层的摩擦腐蚀性能。往复磨损性能表明Ni-65wt%WC涂层的摩擦系数和磨损率降低。涂层（700℃）在 3.5% NaCl 溶液中的摩擦系数和磨损率分别为 0.15 和 4.82 × 10-8 mm3·N-1·m-1。因此，综合比较表明Ni-65WC涂层在腐蚀环境下的低冲击往复试验中具有更好的性能，热处理有助于进一步提高激光熔覆Ni-65wt%WC涂层的摩擦腐蚀性能。