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Tribological Behavior of In Situ TiC/Graphene/Graphite/Ti6Al4V Matrix Composite Through Laser Cladding

查看全文 作　　者：Zhanyong [1,2]Zhao;Lizheng [1]Zhang;Peikang [1]Bai;Wenbo [3]Du;Shaowei [1]Wang;Xiangyan [1]Xu;Qingnan [1]Dong;Yuxin [1]Li;Bing [4]Han 高影响力作者 机构地区：[1]School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;[2]Technical Center,Taiyuan Iron and Steel(Group)Co.,Ltd,Taiyuan 030003,China;[3]National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China;[4]College of Mechatronics Engineering,North University of China,Taiyuan 030051,China高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2021年第34卷第10期,共14页高影响力期刊 基　　金：the National Natural Science Foundation of China(Grant Nos.51775521);the National Defense Foundation of China(No.61400040208);the China Postdoctoral Science Foundation(No.2019M661068);the Key Research and Development Project of Shanxi Province(No.201903D121009);the Natural Science Foundation of Shanxi Province(No.201801D221154);the Shanxi Foundation Research Projects for Application(No.201801D221234);the International Science and Technology Cooperation Program of Shanxi Province(No.201603D421024)。 摘　　要：The TiC/graphene/graphite/Ti6 Al4 V composite coating was prepared by laser cladding.The microstructure and tribological behavior of the coating were studied.The in situ reaction between graphene and Ti occurred,and feathery TiC was formed.The feathery TiC was homogeneously distributed betweenα’acicular martensites which was refined with the addition of graphene.Some graphene was transformed into allotrope graphite under the laser irradiation.The TiC hard particles and the self-lubrication of graphene/graphite improved the wear resistance of composite coating.The wear rate and friction coefficient of TiC/graphene/graphite/Ti6 Al4 V composite coating decreased with the increase in sliding speed,a mechanical mixing layer(MML)was formed on the wear surface of the composite coating under the frictional heat,which protected the substrate and reduced the contact.Because of the self-lubricating properties of graphene/graphite,interlayer sliding occurred easily,which also effectively reduced friction.The wear rate of TiC/graphene/graphite/Ti6 Al4 V composite coating increased with the increase in load,but the friction coefficient decreased.The plastic deformation of subsurface layer was more serious under high load,and a stable self-lubricating MML with a protective effect was formed between the wear interfaces,which reduced the friction coefficient.With the increase in load,the wear mechanism changed from abrasive and oxidation wear to delamination,fatigue and oxidation wear. 关 键 词：Laser-processing Microstructure Coating Titanium alloy FRICTION Wear mechanism
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