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利用YAG脉冲固体激光器,在高纯氩气的保护下,选取优化了的激光工艺参数在45#钢表面制备FeAlCrNiSiC六元高熵合金涂层。主要采用OM、SEM、EDS、XRD和显微硬度等分析手段,对实验制备的合金涂层的形貌、组织结构、成分、相结构、硬度及相关机理进行了研究。实验结果表明:优化的激光熔覆工艺参数为功率85 W,激光扫描速度为5mm/s,能量密度47J/mm2,搭接率50%。采用此优化工艺参数成功制备了与基体形成良好冶金结合的FeAlCrNiSiC高熵合金涂层。制备涂层的硬度达到了800HV,涂层的内部结构由条状等轴晶及网状枝晶组成,组分偏析得到了有效缓解。合金涂层具有FCC结构的γ-Fe和BCC结构的FeAlCrNiSiC固溶体的简单物相,合金元素Al、Cr、Si、Ni、C固溶在两种多组元固溶体中,增加了晶格畸变,使涂层具有高的硬度。
The YAG pulsed solid state laser was used to prepare the FeAlCrNiSiC six-element high-entropy alloy coating on the surface of 45 # steel under the protection of high purity argon gas. The morphology, microstructure, composition, phase structure, hardness and related mechanisms of the prepared alloy coatings were studied by means of OM, SEM, EDS, XRD and microhardness analysis. The experimental results show that the optimum laser cladding parameters are power 85 W, laser scanning speed 5 mm / s, energy density 47 J / mm 2 and lap-over ratio 50%. The FeAlCrNiSiC high-entropy alloy coating with good metallurgical bonding was successfully prepared by using this optimized process parameters. The hardness of the prepared coating reached 800 HV. The internal structure of the coating consisted of equiaxed and strip dendrites, and segregation of components was effectively alleviated. The alloy coating has a simple phase of FeAlCrNiSiC solid solution with FCC structure of γ-Fe and BCC. The alloying elements such as Al, Cr, Si, Ni and C are solid-solution dissolved in two kinds of multi-component solid solution, The coating has a high hardness.