激光熔覆FeCrNiCo-TiC高熵合金复合涂层的组织与耐磨性

doi:10.13251/j.issn.0254-6051.2025.11.048

摘要/Abstract

摘要： 采用激光熔覆技术在SS-316不锈钢基体表面制备FeCrNiCo-TiC复合涂层。系统分析了复合涂层的微观组成、硬度及摩擦磨损性能,并与基体进行对比。结果表明,复合涂层由FCC结构(占比92.7%)和立方相TiC(7.3%)组成,组织主要由胞状晶构成,晶粒尺寸约为20.54 μm。TiC颗粒主要分布在胞状晶边界处,元素分布均匀无偏析。复合涂层硬度(407.6±7.6 HV0.5)较基体(约200 HV0.5)提升104%,摩擦因数从0.678(基体)降至0.544,降幅19.8%。磨损形貌分析进一步揭示,基体以粘着-磨粒协同磨损为主,而涂层因TiC承载作用,犁沟较浅,仅有少量剥落坑,磨损机理为磨粒磨损和轻微的粘着磨损。

关键词: 激光熔覆, 高熵合金, TiC, 复合涂层, 组织, 硬度, 耐磨性

Abstract: FeCrNiCo-TiC composite coating were prepared on SS-316 stainless steel substrate by using laser cladding. The microstructure, hardness and friction-wear properties of the composite coating, as well as the substrate, were analyzed and compared. The results show that the composite coating consists of a face-centered cubic (FCC) phase (92.7%) and cubic TiC particles (7.3%). The microstructure of the composite coating primarily comprises cellular grains with an average grain size of 20.54 μm. TiC particles are predominantly distributed at the boundaries of these cellular grains, with uniform element distribution and no segregation observed. The hardness (407.6±7.6 HV0.5) of the composite coating increases by 104% compared to the substrate (about 200 HV0.5), while the friction coefficient decreases by 19.8% (from 0.678(substrate) to 0.544(coating)). Wear morphology analysis further indicates that the substrate exhibits severe synergistic damage from adhesive and abrasive wear. In contrast, due to the load-bearing effect of TiC, wear morphology of the composite coating shows shallow grooves and only a few peeling pits, of which the wear mechanism is abrasive wear and slight adhesive wear.

Key words: laser cladding, high-entropy alloy, TiC, composite coating, microstructure, hardness, wear resistance

中图分类号:

王海威. 激光熔覆FeCrNiCo-TiC高熵合金复合涂层的组织与耐磨性[J]. 金属热处理, 2025, 50(11): 322-327.

Wang Haiwei. Microstructure and wear resistance of laser cladding FeCrNiCo-TiC high-entropy alloy composite coating[J]. Heat Treatment of Metals, 2025, 50(11): 322-327.

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