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采用氩弧熔覆工艺在06Cr19Ni10钢基体上制备等摩尔比AlCrFeCoNiCu高熵合金涂层。采用10%草酸溶液体系对不同熔覆电流制备的高熵合金涂层进行电解腐蚀,采用倒置金相显微镜观察试样显微组织,采用3D激光共聚焦显微镜对高熵合金涂层中的细小析出物进行微区三维显微形貌分析,并采用自动转塔显微硬度计对其截面显微硬度进行分析。结果表明,以不同熔覆电流制备的AlCrFeCoNiCu高熵合金涂层均由枝晶组织、枝晶间组织、块状析出物以及纳米级析出物组成。以240 A熔覆电流制备的涂层由于热输入过大,过热粗化的枝晶组织在凝固过程中发生臂端部位的熔解。240 A熔覆电流制备的熔覆层的表面硬度达到最高,但截面硬度较低。230 A熔覆电流制备的熔覆层的表面硬度、截面硬度均较理想。
Equal molar ratio AlCrFeCoNiCu high entropy alloy coating was prepared on 06Cr19Ni10 steel by argon arc cladding. The 10% oxalic acid solution was used to electrolyze the high-entropy alloy coating prepared by different current. The microstructure of the sample was observed by inverted metallographic microscope. The microstructure of high-entropy alloy coating was observed by 3D laser confocal microscopy Three-dimensional micro-morphological analysis of micro-area, and the use of automatic turret micro-hardness of the cross-section of its microhardness analysis. The results show that the AlCrFeCoNiCu high entropy alloy coatings prepared by different current are composed of dendrite structure, interdendritic structure, massive precipitates and nanoscale precipitates. Coatings prepared with a 240 A cladding current melt at the end of the arm during solidification due to excessive heat input. The surface hardness of the cladding prepared by 240 A cladding current is the highest, but the hardness of the section is lower. The surface hardness and cross-section hardness of the cladding layer prepared by 230 A current are all ideal.