Spark Plasma Sintering of Graphene-Reinforced Inconel 738LC Alloy: Wear and Corrosion Performance

Olugbenga Ogunbiyi; Tamba Jamiru; Rotimi Sadiku; Oluwagbenga Adesina; Olanrewaju Seun Adesina; Babatunde Abiodun Obadele

doi:10.1007/s12540-020-00871-x

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저자정보: Olugbenga Ogunbiyi (Tshwane University of Technology) Tamba Jamiru (Tshwane University of Technology) Rotimi Sadiku (Tshwane University of Technology) Oluwagbenga Adesina (Tshwane University of Technology) Olanrewaju Seun Adesina (Landmark University) Babatunde Abiodun Obadele (Botswana International University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.3

발행연도: 2022.3

수록면: 695 - 709 (15page)

DOI: 10.1007/s12540-020-00871-x

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This study aims to investigate the microstructure, corrosion and tribological properties of spark plasma sintered graphenenanoplatelets (GNPs) reinforced Inconel 738 low carbon composites. The matrix and reinforcement were thoroughly milledin order to ensure homogeneity. Thereafter, the milled powders were consolidated by using spark plasma sintering. Themicrostructural evolution and the phases formed were examined by the using scanning electron microscopy and X-ray diffractometrytechniques. The corrosion analysis was investigated in acidic and basic media, while the tribological test wasconducted under dry sliding conditions at varying loads. The results show that the microhardness values were significantlyinfluenced by varying the GNPs constituents in Inconel 738LC from 384 to 459 HV0.5,while the sintered density was influencedby the sintering parameters. The corrosion response of the sintered composites in both acidic and basic media arecomparable, irrespective of the varying GNPs content in the matrix. The wear performance suggests that the addition ofGNPs to IN738LC, greatly enhanced the wear resistance and reduced the friction coefficient of the sintered IN738LC-GNPscomposites. The improvement is attributed to the influence of the graphene-based tribofilm that formed on the sliding contactinterface, which reduced friction coefficient. Likewise, graphene has a slight potential of forming continuous tribofilms atthe friction interface due to its lubricity. It is thought that the GNPs reinforcement reduced the pull-out tendency, duringwear activities.

#Graphene nanoplatelets · Nickel-based composites · Mechanical properties · Corrosion · Wear properties

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