Wear performance of GGG60 ductile iron rollers coated with WC-Co by electro spark deposition

IF 0.6 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
M. Buğday, Mehmet Karalı, Ş. Talaş
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引用次数: 0

Abstract

Nodular cast irons are used in many industrial applications such as machine frames and body, rollers and engine blocks due to their higher strengths and ductility with good machinability comparable to grey cast irons. In this study, the outer surface of nodular cast irons (GGG-60) was coated with WC/Co using electro spark deposition (ESD). The aim of the study is to improve both the surface quality and wear behaviour with the coatings formed on the surface of the plastic deformation rollers, whose wear resistance decreases over the time due to high stress working conditions. Heat treatment at 950 ºC for 2 h was applied to the GGG60 specimen rollers and half of the rollers were uncoated and the other half was coated with WC-Co electrodes. The wear behaviour of the heat treated and coated surfaces was measured by ball-on-disc wear method using Al2O3 ball bearing with a diameter of 6 mm for a sliding distance of 250 m at a sliding rate of 6.5 m·s-1 under a dry condition, and using a load of 40 N. WC/Co coatings were successfully applied to rollers. In the SEM/EDS images, the presence of W, Fe, C, Co and Al elements in the coated part of the rollers and Fe, C and Al elements in the uncoated region were detected. It was concluded that Coating and heat treatment increased the wear resistance by nearly 5 times and decreased the friction coefficient by 2.13 times.
通过电火花沉积法在 GGG60 球墨铸铁辊上涂覆 WC-Co 的磨损性能
球墨铸铁的强度和延展性较高,机加工性能良好,可与灰口铸铁媲美,因此被广泛应用于机器框架和机身、轧辊和发动机缸体等工业领域。在这项研究中,使用电火花沉积(ESD)技术在球墨铸铁(GGG-60)的外表面涂覆了 WC/Co。该研究的目的是通过在塑性变形辊表面形成的涂层改善表面质量和磨损性能,因为在高应力工作条件下,塑性变形辊的耐磨性会随着时间的推移而降低。在 950 ºC 下对 GGG60 试样辊进行了 2 小时的热处理,其中一半辊未进行涂层,另一半辊涂有 WC-Co 电极。在干燥条件下,使用直径为 6 mm 的 Al2O3 滚珠轴承,以 6.5 m-s-1 的滑动速度滑动 250 米,负载为 40 N,采用盘上球磨损法测量了热处理和涂层表面的磨损情况。在 SEM/EDS 图像中,检测到辊子涂层部分存在 W、Fe、C、Co 和 Al 元素,未涂层区域存在 Fe、C 和 Al 元素。结论是,涂层和热处理使耐磨性提高了近 5 倍,摩擦系数降低了 2.13 倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Revista De Metalurgia
Revista De Metalurgia 工程技术-冶金工程
CiteScore
1.30
自引率
25.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: Revista de Metalurgia is a bimonhly publication. Since 1998 Revista de Metalurgia and Revista Soldadura have been combined in a single publicación that conserves the name Revista de Metalurgia but also includes welding and cutting topics. Revista de Metalurgia is cited since 1997 in the ISI"s Journal of Citation Reports (JCR) Science Edition, and in SCOPUS.
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