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采用等离子熔覆技术,在20钢表面分别制备了含5%(B,C)、7%(B,C)和9%(B,C)的Fe基合金(Fe-Cr-Mn-Si-B-C-RE)熔覆层。利用光学显微镜、扫描电镜、X射线衍射仪、显微硬度仪、电化学工作站等设备对三种熔覆层的显微组织结构、硬度和耐腐蚀性能进行了研究,并探究了B、C含量变化对熔覆层组织与性能的影响。结果表明,熔覆层与基体形成良好的冶金结合,主要由α-Fe(Cr)相组成。熔覆层的硬度明显高于基体。随着B、C总含量的升高,熔覆层中出现了(Cr,Fe)_7C_3相,使得熔覆层的硬度和在3.5%Na Cl溶液中的耐腐蚀性能逐渐增强。
The Fe-Cr-Mn-Si-Fe alloy with 5% (B, C), 7% (B, C) and 9% (B, C) BC-RE) cladding layer. The microstructure, hardness and corrosion resistance of the three coatings were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, microhardness tester and electrochemical workstation. The effects of B, C content Effect of Variation on Microstructure and Properties of Cladding Layer. The results show that the cladding layer and the matrix form a good metallurgical bond, mainly composed of α-Fe (Cr) phase. The hardness of the cladding is significantly higher than the matrix. With the increase of the total content of B and C, the (Cr, Fe) _7C_3 phase appeared in the cladding layer, so that the hardness of the cladding layer and the corrosion resistance in 3.5% NaCl solution gradually increased.