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.
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.