感应重熔和激光重熔合成FeCrMnAlCu高熵合金涂层组织与性能

采用冷喷涂辅助感应重熔和冷喷涂辅助激光重熔2种方法分别在45#钢表面制备FeCrMnAlCu高熵合金涂层。对高熵合金涂层的相组成、显微组织、硬度、耐磨性能进行表征与检测，研究2种工艺对涂层耐磨性能的影响。结果表明：2种工艺合成的FeCrMnAlCu高熵合金涂层均由体心立方（bcc）和面心立方（fcc）相组成，涂层组织致密，元素分布均匀。涂层微观组织均为树枝晶+枝晶间组织，枝晶区主要由Mn、Cr和Fe元素构成，枝晶间主要为Cu,Al元素均匀地分布在枝晶和枝晶间。冷喷涂辅助感应重熔合成的FeCrMnAlCu高熵合金涂层中bcc晶格应变大于激光重熔合成的高熵合金涂层的晶格应变。冷喷涂辅助感应重熔合成FeCrMnAlCu高熵合金涂层的显微硬度是冷喷涂辅助激光重熔合成涂层硬度的1.2倍，是45#钢基体硬度的3.5倍。FeCrMnAlCu高熵合金涂层在摩擦过程中主要以磨粒磨损为主，采用冷喷涂辅助感应重熔合成的FeCrMnAlCu高熵合金涂层具有良好的耐磨性能，其磨损率比冷喷涂辅助激光重熔合成涂层的磨损率降低29%。

Microstructure and Properties of FeCrMnAlCu HEA Coatings Synthesized by Induction Remelting and Laser Remelting

FeCrMnAlCu high-entropy alloy (HEA) coatings were prepared on the surface of 45# steel by cold spraying-assisted induction remelting and cold spraying-assisted laser remelting. The phase composition, microstructure, microhardness, and wear resistance of the HEA coatings were characterized, and the effects of the two processes on the wear resistance of HEA coatings were studied. Results show that the FeCrMnAlCu HEA coatings synthesized by these two methods are composed of body-centered cubic (bcc) and face-centered cubic (fcc) phases. The coating microstructure is dense and the elements are evenly distributed. The microstructures of coatings consist of dendrite+interdendrite structures, and the dendrite region is mainly enriched with Mn, Cr, and Fe elements, while the interdendrite region is rich in Cu. In addition, the Al element is evenly distributed between the dendrite and interdendrite. The lattice strain of bcc phase in FeCrMnAlCu HEA coating synthesized by cold spraying-assisted induction remelting is greater than that by cold spraying-assisted laser remelting. The microhardness of the FeCrMnAlCu HEA coating synthesized by cold spraying-assisted induction remelting is 1.2 times higher than that by cold spraying-assisted laser remelting and 3.5 times higher than that of the 45# steel matrix. The friction process of FeCrMnAlCu HEA coating is mainly the abrasive wear. The FeCrMnAlCu HEA coating synthesized by cold spraying-assisted induction remelting has good wear resistance, and its wear rate is 29% lower than that by cold spraying-assisted laser remelting.