目的 在FV520B不锈钢基体上，采用等离子熔覆技术制备多元镍基涂层，研究不同成分配比涂层-基体协同作用下的力学性能。方法 通过扫描电子显微镜分析涂层的表面及界面形貌，并对涂层-基体进行了拉伸及高温压缩性能测试，得到各涂层的抗拉强度及高温变形抗力，对比分析组织、相分布特征及涂层成分对涂层-基体系统力学性能的影响。结果 等离子熔覆涂层组织致密，界面处呈现良好的冶金结合，这种结合方式可提高涂层-基体的综合力学性能；涂层-基体协同作用可显著提高材料的抗拉强度及变形抗力，且涂层的成分、组织及相分布特征是影响涂层-基体协同形变行为的关键因素。其中，Ni60+20%Ti涂层材料的抗拉伸性能最好，抗拉强度高达921 MPa，较基体材料提高了19.6%。Ni60+30%Ti+10%WC涂层-基体的高温力学性能最好，高温变形抗力达687.87 MPa。结论 等离子熔覆多元镍基涂层使基体材料的抗拉强度有所提高，且高温变形抗力提高显著。

The work aims to study mechanical property under synergistic effect of coating-substrate in different composition proportion by preparing multi-element nickel-based coatingon FV520B stainless steel substrate by adopting plasma cladding technology. Surface and interface morphology of the coatingswere observed byusing scanning electron microscope (SEM), tensile and high temperature compression property of the coating-substrate were tested. Tensile strength and high temperature deformation resistance of each coating were obtained. Influences of structure, phase distribution characteristics and coating composition on mechanical properties of the coating-substrate system were analyzed. Plasma cladded coatings featured in dense microstructure and good metallurgical bonding on interface, the bonding mode could improve comprehensive mechanical property of the coating-substrate; synergistic effectof the coating-substrate could improve tensile strength and deformation resistance significantly, and composition, structure and phase distribution characteristics of the coatingswere key factors influencing synergistic deformation behavior of the coating-substrate. The coating Ni60+20%Ti exhibited the best tensile strength, which was up to 921 MPa, 19.6% higher than that of substrate material. The coating Ni60+30%Ti+10%WC exhibited the best high temperature mechanical properties, the high temperature deformation resistance was up to 687.87 MPa. Tensile strength of the plasma claddedmulti-element nickel-based coating on the substrate improves, and the high temperature deformation resistance improves significantly.