Effect of electron beam remelting on microstructure and wear properties of HVOF Ni/WC coatings

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-09-05 DOI:10.1016/j.wear.2024.205560
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引用次数: 0

Abstract

In order to improve the wear resistance of Inconel 617 alloy, Ni/WC composite coatings were prepared on it by High-Velocity Oxygen Fuel (HVOF) and electron beam remelting techniques. The effects of remelting beam current (16 mA–25 mA) on the macroscopic morphology, physical phase composition and microstructure of remelted coatings were investigated. The effect of microcomposition on the mechanical properties of remelted coatings was analyzed in combination with hardness tests and friction wear experiments. The experimental results showed that good metallurgical bonding was formed for 19 mA, 22 mA and 25 mA specimens after electron beam remelting. The bonding of the 16 mA specimen was a combination of metallurgical and mechanical bonding. The remelted coating generated new phases such as W2C, M3B and Cr23C6. With the increase of remelting beam current, the WC decomposition became more and more serious, and the grain growth tendency was evident. The remelted coatings prepared with different parameters showed a significant increase in microhardness compared to both the substrate and HVOF coatings. Friction wear experiments with SiC balls as counterbodies show that the wear increases gradually with increasing beam flow at 100 N and under dry friction conditions. The wear mechanism of HVOF coatings was abrasive, and the wear mechanism of remelted coatings was mainly abrasive and adhesive. In summary, the 22 mA specimen had a strong metallurgical bond. The hardness and abrasion resistance were improved compared to the substrate and the HVOF coating, i.e., the 22 mA specimen had the best overall performance.

电子束重熔对 HVOF Ni/WC 涂层微观结构和磨损性能的影响
为了提高 Inconel 617 合金的耐磨性,采用高速氧气燃料(HVOF)和电子束重熔技术制备了 Ni/WC 复合涂层。研究了重熔束电流(16 mA-25 mA)对重熔涂层的宏观形貌、物相组成和微观结构的影响。结合硬度测试和摩擦磨损实验,分析了微观组成对重熔涂层机械性能的影响。实验结果表明,19 mA、22 mA 和 25 mA 试样在电子束重熔后形成了良好的冶金结合。16 mA 试样的结合是冶金结合和机械结合的结合。重熔涂层产生了 W2C、M3B 和 Cr23C6 等新相。随着重熔束电流的增加,WC 分解越来越严重,晶粒生长趋势明显。与基体和 HVOF 涂层相比,用不同参数制备的重熔涂层的显微硬度显著提高。以 SiC 球为反面的摩擦磨损实验表明,在 100 N 和干摩擦条件下,磨损量随着束流的增加而逐渐增大。HVOF 涂层的磨损机理是研磨,而重熔涂层的磨损机理主要是研磨和粘合。总之,22 毫安试样具有很强的冶金结合力。与基体和 HVOF 涂层相比,硬度和耐磨性都有所提高,即 22 mA 试样的综合性能最好。
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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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