Revealing the elevated temperature fretting wear behavior of laser cladding graphene/Co-based composite coating

IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2025-06-10 DOI:10.1016/j.wear.2025.206204
Mingyuan Zhang , Yuanzhe Huang , Shouren Wang , Zhen Xiao , Ben Li , Cunkuan Zhu , Jiazheng Du
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引用次数: 0

Abstract

In this study, Co-based (Co06) coatings reinforced by graphene (Gr) with 0 %–1.5 % contents were successfully deposited on 316 stainless steel via laser cladding. The influence of the Gr contents on the phase constituent, microstructure, and fretting wear resistance at 285 °C of coatings were systematically investigated. Results confirmed that the microstructure of composite coatings exhibited the γ-Co, Cr23C6, and Cr7C3 structure. With the Gr content increased from 0 % to 1.5 %, the average grain size of the coating gradually decreased and then increased, and the microhardness of the composite coatings was improved from 360.6 HV0.2 to 516.9 HV0.2. When the Gr content was 1.0 %, the coating exhibited the minimum average grain size (4.83 μm) and maximum microhardness (144.2 % higher than substrate). Besides, the coefficients of friction of Gr reinforced coatings were lower than that of the substrate, and the fretting wear resistance under 285 °C condition was improved. This can be attributed to the increase in coating hardness and the self-lubricating of Gr. The highest wear resistance was also obtained at 1.0 % Gr content. Thus, an appropriate amount of Gr can effectively enhance the comprehensive properties of the coating. Furthermore, finite element analysis reveals that larger contact pressure and shear stress were produced in the Gr sample compared with the substrate. The wear scar generated during the fretting process released the stress in the contact area, reducing the contact pressure and shear stress.
揭示激光熔覆石墨烯/钴基复合涂层的高温微动磨损行为
在本研究中,通过激光熔覆,成功地在316不锈钢表面沉积了含有0 ~ 1.5%含量的石墨烯(Gr)增强的co基(Co06)涂层。系统研究了Gr含量对镀层相组成、显微组织和285℃微动磨损性能的影响。结果表明,复合涂层的微观结构表现为γ-Co、Cr23C6和Cr7C3结构。随着Gr含量从0%增加到1.5%,镀层的平均晶粒尺寸先减小后增大,复合镀层的显微硬度由360.6 HV0.2提高到516.9 HV0.2。当Gr含量为1.0%时,涂层的平均晶粒尺寸最小(4.83 μm),显微硬度最大(比基体高144.2%)。此外,Gr增强涂层的摩擦系数低于基体,在285℃条件下的微动耐磨性得到提高。这可以归因于涂层硬度的增加和Gr的自润滑性。当Gr含量为1.0%时,耐磨性最高。因此,适量的Gr可以有效地提高涂层的综合性能。此外,有限元分析表明,与基体相比,Gr试样产生了更大的接触压力和剪切应力。微动过程中产生的磨损疤痕释放了接触区域的应力,降低了接触压力和剪应力。
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
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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