ISSN   1004-0595

CN  62-1095/O4

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陆小龙, 刘秀波, 余鹏程, 陈瑶, 石皋莲, 吴少华, 徐东. 后热处理对304不锈钢激光熔覆Ni60/h-BN自润滑耐磨复合涂层组织和摩擦学性能的影响[J]. 摩擦学学报, 2016, 36(1): 48-54. DOI: 10.16078/j.tribology.2016.01.008
引用本文: 陆小龙, 刘秀波, 余鹏程, 陈瑶, 石皋莲, 吴少华, 徐东. 后热处理对304不锈钢激光熔覆Ni60/h-BN自润滑耐磨复合涂层组织和摩擦学性能的影响[J]. 摩擦学学报, 2016, 36(1): 48-54. DOI: 10.16078/j.tribology.2016.01.008
LU Xiaolong, LIU Xiubo, YU Pengcheng, CHEN Yao, SHI Gaolian, WU Shaohua, XU Dong. Effects of Post Heat-Treatment on Microstructure and Tribological Properties of Ni60/H-BN Self-Lubricating Anti-Wear Composite Coating on 304 Stainless Steel by Laser Cladding[J]. TRIBOLOGY, 2016, 36(1): 48-54. DOI: 10.16078/j.tribology.2016.01.008
Citation: LU Xiaolong, LIU Xiubo, YU Pengcheng, CHEN Yao, SHI Gaolian, WU Shaohua, XU Dong. Effects of Post Heat-Treatment on Microstructure and Tribological Properties of Ni60/H-BN Self-Lubricating Anti-Wear Composite Coating on 304 Stainless Steel by Laser Cladding[J]. TRIBOLOGY, 2016, 36(1): 48-54. DOI: 10.16078/j.tribology.2016.01.008

后热处理对304不锈钢激光熔覆Ni60/h-BN自润滑耐磨复合涂层组织和摩擦学性能的影响

Effects of Post Heat-Treatment on Microstructure and Tribological Properties of Ni60/H-BN Self-Lubricating Anti-Wear Composite Coating on 304 Stainless Steel by Laser Cladding

  • 摘要: 采用激光熔覆技术在304不锈钢表面制备了Ni60/h-BN自润滑耐磨复合涂层, 对涂层在600 ℃(去应力退火) 进行1 h和2 h热处理, 分析了热处理前后复合涂层的显微组织、硬度和摩擦学性能的变化。结果表明: 三种涂层中, 热处理1 h后涂层的显微硬度最大(最高值HV0.5765.0), 在10 N干摩擦条件下, 其摩擦系数为0.39, 磨损率为 3.37×10-6 mm/(Nm), 该涂层表现出最好的耐磨减摩性能, 磨损机理主要表现为轻微的磨粒磨损; 未热处理的涂层摩 擦系数为0.53, 磨损率为6.39×10-6 mm/(Nm), 磨损机理主要表现为脆性断裂、黏着磨损和磨粒磨损; 热处理2 h后的 涂层摩擦系数为0.39, 磨损率为5.29×10-6 mm/(Nm), 磨损机理主要表现为磨粒磨损和轻微黏着磨损。在本文试验条 件下, 后热处理1 h可有效提高激光熔覆自润滑耐磨涂层的硬度并改善其耐磨减摩性能。

     

    Abstract: The Ni60/h-BN self-lubricating anti-wear composite coatings were prepared on 304 stainless steel substrate by laser cladding, and the composite coatings were heat treated at 600 ℃ (stress relief annealing) for 1 h and 2 h, respectively. The differences of the phase compositions, microhardness and tribological properties of the composite coatings after heat treatment have been investigated. Results indicate that the coating after heat treatment for 1 h had the highest microhardness (about HV0.5765.0). For the best tribological properties under 10 N dry sliding wear test condition, the friction coefficient was 0.53, the wear rate was 3.37×10-6 mm/(Nm) and the wear mechanism was mild abrasive wear. The friction coefficient and the wear rate of the coating without heat treatment were 0.53 and 6.39×10-6 mm/(Nm), respectively. The wear mechanism was the combination of brittle fracture, adhesive wear and abrasive wear. The friction coefficient and the wear rate of the coating after heat treatment for 2 h were 0.39 and 5.29×10-6 mm/(Nm), respectively. The wear mechanism was mainly abrasive wear and mild adhesive wear. In this paper, the laser clad self-lubricating anti-wear composite coating after heat treatment for 1 h presented the highest microhardness and the most excellent tribological properties.

     

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