激光增材制造原位mc增强CoCrMoNbTi高熵合金涂层的组织与力学性能

L. He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan
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引用次数: 1

摘要

采用激光熔融沉积技术在Ti-6Al- 4V钛合金基体上制备了原位碳化物(TiC/Cr7C3)增强CoCrMoNbTiC0.2高熵合金涂层。研究了激光功率对表面形貌、相一致性、显微组织和显微硬度的影响。结果表明,该涂层由简单的BCC固溶体和少量的TiC和Cr7C3碳化物组成。原位MC (TiC/Cr7C3)碳化物均匀分布在BCC基体中。激光功率对涂层的成形质量和力学性能有重要影响。当激光功率为1500 W时,涂层基本无缺陷,呈现出良好的枝晶结构。随着激光功率的增大,涂层的显微硬度先升高后逐渐降低。涂层最高显微硬度(1500 W)达到650 HV0.5,是基体硬度的2倍。该涂层优异的力学性能是第二相强化、固溶强化和微观组织的协同作用的结果。
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Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing
In situ carbides (TiC/Cr7C3) reinforced CoCrMoNbTiC0.2 high-entropy alloy coatings were prepared on the Ti-6Al- 4V titanium alloy substrate by laser melting deposition technology. Effect of the laser power on the surface morphology, phase consistent, microstructure and microhardness were investigated. The results show that the coatings were composed of a simple BCC solid solution and a small amount of TiC and Cr7C3 carbides. The in-situ MC (TiC/Cr7C3) carbides were evenly distributed in the BCC matrix. The laser power has a significant impact on the forming quality and mechanical properties of the coatings. As the optimal laser power of 1500 W were applied, the coating mostly free of defects exhibited a fine dendritic microstructure. With the increasing laser power, the microhardness of the coatings was first increased and then decreased gradually. The highest microhardness of the coating (1500 W) was up to 650 HV0.5, which was 2 times higher than that of the substrate. The excellent mechanical properties of the coatings were attributed to the synergetic effects of the second phase strengthening, solid solution strengthening and fine microstructure.
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