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采用氩弧熔覆工艺在Q235基体上制备了等摩尔比FeCrNiCoMn高熵合金涂层,采用倒置金相显微镜、自动转塔显微硬度计及3D激光共聚焦显微镜对高熵合金涂层组织及显微硬度进行了分析。结果表明,不同熔覆电流下,FeCrNiCoMn高熵合金涂层均主要由枝晶组织和枝晶间组织组成,且其枝晶间组织中均生成了大量纳米级的析出物。在180~190 A范围内,随熔覆电流的增大,组织显著细化,且枝晶间组织中纳米级析出物形状规则,分布均匀;熔覆电流增大至200 A,涂层组织过度粗大,枝晶间组织被破坏,枝晶间组织中纳米析出物形状、分布均不理想。不同熔覆电流下,FeCrNiCoMn高熵合金涂层表面显微硬度差别不大。180、190 A熔覆电流制备的涂层比200 A熔覆电流制备的涂层截面显微硬度分布更理想。
Equal molar ratio of FeCrNiCoMn high entropy alloy coating was prepared on Q235 substrate by argon arc cladding process. The microstructure and microstructure of high entropy alloy coating were characterized by inverted optical microscope, automatic turret microhardness tester and 3D laser confocal microscope Microhardness was analyzed. The results show that the FeCrNiCoMn high-entropy alloy coatings are mainly composed of dendrites and dendrites at different cladding currents, and a large amount of nanoscale precipitates are formed in the interdendritic structures. In the range of 180-190 A, the microstructure is refined remarkably with the increase of the cladding current, and the shape of nano-scale precipitates in the interdendritic grains is regular and distributed uniformly. The current of cladding increases to 200 A, Coarse, the interdendritic tissue is damaged, the interdendritic nano-precipitates in the shape and distribution are not ideal. Under different current, the microhardness of FeCrNiCoMn high-entropy alloy coating has little difference. 180,190 A cladding current coating prepared than the 200 A cladding current coating cross-section microhardness distribution is more ideal.