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中文摘要: 采用激光熔覆技术, 在基体 45# 钢板上熔覆了含 Nb 的双相不锈钢涂层。 采用扫描电子显微镜 (SEM) 和能
谱分析仪 (EDS) 对涂层的微观组织和元素组成进行了表征分析, 测试了涂层沿深度方向上的显微硬度, 在 20℃条
件下进行了 UMT 摩擦磨损试验, 并在 3.5 wt.% 的 NaCl 水溶液中进行电化学测试。 结果表明: 在双相不锈钢合
金粉中添加 Nb 进行激光熔覆, 所制备的熔覆层中碳化物由 Cr 和 Nb 的碳化物组成, 同时 Cr 含量显著降低; 熔
覆层中添加 Nb 后, 其硬度和耐磨性比未添加 Nb 的熔覆层有显著提高, Nb 含量为 1.4% 的时候效果最好; 随着
Nb 含量的增大, 自腐蚀电位逐渐增大, 自腐蚀电流密度逐渐降低, 说明 Nb 含量越高熔覆层的耐蚀性越好。 综上
所述, 当熔覆层中 Nb 含量为 1.4% 的时候, 其耐磨性和耐蚀性最好。
Abstract:A duplex stainless steel coating containing Nb element was cladded on the 45# steel substrate by laser
cladding technology. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were
used to characterize the microstructure and elemental composition of the coating. The microhardness of the
coating along the depth was tested. UMT friction and abrasion test was performed at 20℃ . The electrochemical
test in 3.5 wt.% NaCl aqueous solution were conducted. The results show that the Nb element is added to the
duplex stainless steel alloy powder for laser cladding. The carbides in the cladded layer are composed of Cr and
Nb, and the Cr content is significantly reduced. With the addition of Nb, both hardness and abrasion resistance of
the cladded layer are significantly improved compared with the layer without Nb. The cladded layer exhibited the
best performance when Nb content is 1.4%. As the Nb content increases, the self-corrosion potential gradually
increases, while the self-corrosion current density gradually decreases, indicating that the higher Nb content, the
better the corrosion resistance of the cladded layer. In summary, when Nb content in the cladded layer is 1.4%,
the cladded layer exhibited the best wear resistance and corrosion resistance performance.
keywords: Laser cladding Nb element Duplex stainless steel Microstructure Abrasion resistance Electrochemical corrosion
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引用文本:
黄恩泽,杜开平,王旭,皮自强,章德铭.Nb 对双相不锈钢激光熔覆组织及性能的影响研究[J].热喷涂技术,2020,12(1):19-24.
黄恩泽,杜开平,王旭,皮自强,章德铭.Nb 对双相不锈钢激光熔覆组织及性能的影响研究[J].热喷涂技术,2020,12(1):19-24.