等离子堆焊FeCoNiAlTi高熵合金涂层组织结构演化及力学性能研究  

Structural Evolution and Mechanical Properties of FeCoNiAlTi HEA Coatings Fabricated by Plasma Surfacing

作　　者：汪永宏 张春霖 张诗涵 于建平 刘英夫 解志文 WANG Yonghong;ZHANG Chunlin;ZHANG Shihan;YU Jianping;LIU Yingfu;XIE Zhiwen(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《材料保护》2025年第4期56-69,共14页Materials Protection

基　　金：国家重点研发计划项目(2021YFB3702003)。

摘　　要：为了深入研究等离子堆焊工艺参数中堆焊电流对FeCoNiAlTi高熵合金涂层微观组织结构及力学性能的影响,采用5种不同堆焊电流(140,160,180,200,220 A)进行涂层制备,并利用XRD、OM、SEM、显微维氏硬度计、台阶仪、摩擦磨损仪和万能试验机分别对涂层的微观结构、硬度、耐磨性和拉伸性能进行评判。结果表明:随着堆焊电流的增加,涂层的孔隙率及元素偏析得到了明显的改善,然而对涂层物相组成没有显著影响,涂层主要由典型的FCC固溶体相和Co_(3)Ti析出相组成。当堆焊电流为180 A时,T3涂层的表面显微硬度最高为322.77 HV_(0.2),约为基体的2倍。同时,T3涂层耐磨损性能表现最佳,最大磨损深度仅为2.144μm,平均摩擦系数为0.362,且具有最少磨损率3.83×10^(-6) mm^(3)/(Nm)。此外,T3涂层抗拉强度和延伸率分别为948 MPa和26.61%,展现出较为优异的强韧性。In order to deeply study the influence of the surfacing current on the microstructure and mechanical properties of FeCoNiAlTi high-entropy alloy coatings in the plasma surfacing process parameters,five different surfacing currents(140,160,180,200,220 A)were used for coating preparation,and the microstructure,hardness,wear resistance and tensile properties of the coatings were evaluated by XRD,OM,SEM,micro-Vickers hardness tester,profilometer,friction wear tester and universal testing machine,respectively.Results showed that the po-rosity and elemental segregation of the coating were significantly improved with the increase of the surfacing current,but there was no significant effect on the coating phase composition.The coating mainly consisted of the typical FCC solid solution phase and Co_(3)Ti precipitation phase.When the surfacing current was 180 A,the surface microhardness of the obtained T3 coating was up to 322.77 HV_(0.2),which was about twice that of the substrate.At the same time,the T3 coating showed the best wear resistance,with a maximum wear depth of only 2.144μm,an av-erage friction coefficient of 0.362 and the lowest wear rate of 3.83×10^(-6) mm^(3)/(N·m).In addition,the tensile strength and elongation of the T3 coating were 948 MPa and 26.61%,respectively,showing excellent strength and toughness.

关 键 词：高熵合金 等离子堆焊 堆焊电流 摩擦磨损 拉伸性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]