Improving Tribological Performance of Inconel 625 by Combining Groove-Textured Surfaces with Sn-Ag-Cu Solid Lubricant
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JMEPEG https://doi.org/10.1007/s11665-020-05363-y
Improving Tribological Performance of Inconel 625 by Combining Groove-Textured Surfaces with Sn-Ag-Cu Solid Lubricant Jin Zhang, Guanchen Lu, Xiaoliang Shi, Zhenyu Yang, Yawen Xue, and Hongyan Zhou Submitted: 1 March 2020 / Revised: 6 November 2020 / Accepted: 16 November 2020 High wear is the primary failure mechanism of Inconel 625 in mechanical parts. The surface modification is workable method to improve tribological performance of Inconel 625. In this paper, the groove-textured surfaces with different widths and pitches were prepared on the surfaces of Inconel 625 by electrical discharge machining technology. The Sn-Ag-Cu solid lubricant was deposited on the grooves. The synergistic effects of Sn-Ag-Cu solid lubricant and groove-textured surface on the tribological performance of Inconel 625 were studied. Results show that the groove-textured surface of Inconel 625 filled with Sn-Ag-Cu solid lubricant shows the lowest friction. Compared with the untextured sample, the friction coefficients of groove-textured sample with the groove density of 20% and the groove-textured sample with the groove density of 25% filled by Sn-Ag-Cu are reduced 35% and 48%, respectively. The textures can trap wear debris under the dry sliding condition. In addition, Sn-Ag-Cu alloys filled in the grooves supply the sufficient lubricant at the contact interface during the sliding process. The lubricating film on the contact surface is formed gradually, which is mainly due to the shear adaptability and low melting point of Sn-AgCu alloy. It shows that deposition of Sn-Ag-Cu solid lubricant coating on the groove-textured surface is an effective way for improving the friction and wear performance of Inconel 625. Keywords
friction, Inconel micro-textures
625,
solid
lubricant,
surface
1. Introduction Inconel 625 (alloy 625) is a nickel-based high-temperature alloy, which has a good combination of tensile strength, yield strength, creep strength, good fabricability, weldability and good resistance to high temperature corrosion (Ref 1, 2). It has been widely used in aeronautical, aerospace, chemical, petrochemical and marine applications (Ref 3). The friction pairs components of Inconel and the bearing steel can be used for the friction components of automobile, such as plunger of injection systems and bearing system. The gas foil bearings work at the stages of the start-up, stops and accidental overloads, and the contact surface of the inner foil would suffer severe wear, which limits the life of bearings, thus requiring a structure with solid lubricants that can be used in this case (Ref 4, 5). Inconel 625 cannot meet the requirements completely because of the higher friction coefficient and wear. Therefore, the way of solid lubricants filled into surface micro-structures is studied to improve the tribological performance of Inconel 625 (Ref 2, 6). In recent years, non-smooth surfaces with micro texture and biomimetic structure have showed the unique anti-wear prop-
Jin Zhang, Guanchen Lu, Xiao
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