Spark Plasma Sintering of Graphene-Reinforced Inconel 738LC Alloy: Wear and Corrosion Performance
- PDF / 2,156,043 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 96 Downloads / 209 Views
Spark Plasma Sintering of Graphene‑Reinforced Inconel 738LC Alloy: Wear and Corrosion Performance Olugbenga Ogunbiyi1 · Tamba Jamiru1 · Rotimi Sadiku3 · Oluwagbenga Adesina1 · Olanrewaju Seun Adesina2 · Babatunde Abiodun Obadele4 Received: 28 May 2020 / Accepted: 25 August 2020 © The Korean Institute of Metals and Materials 2020
Abstract This study aims to investigate the microstructure, corrosion and tribological properties of spark plasma sintered graphene nanoplatelets (GNPs) reinforced Inconel 738 low carbon composites. The matrix and reinforcement were thoroughly milled in order to ensure homogeneity. Thereafter, the milled powders were consolidated by using spark plasma sintering. The microstructural evolution and the phases formed were examined by the using scanning electron microscopy and X-ray diffractometry techniques. The corrosion analysis was investigated in acidic and basic media, while the tribological test was conducted under dry sliding conditions at varying loads. The results show that the microhardness values were significantly influenced by varying the GNPs constituents in Inconel 738LC from 384 to 459 H V0.5, while the sintered density was influenced by the sintering parameters. The corrosion response of the sintered composites in both acidic and basic media are comparable, irrespective of the varying GNPs content in the matrix. The wear performance suggests that the addition of GNPs to IN738LC, greatly enhanced the wear resistance and reduced the friction coefficient of the sintered IN738LC-GNPs composites. The improvement is attributed to the influence of the graphene-based tribofilm that formed on the sliding contact interface, which reduced friction coefficient. Likewise, graphene has a slight potential of forming continuous tribofilms at the friction interface due to its lubricity. It is thought that the GNPs reinforcement reduced the pull-out tendency, during wear activities. Keywords Graphene nanoplatelets · Nickel-based composites · Mechanical properties · Corrosion · Wear properties
1 Introduction
* Olugbenga Ogunbiyi [email protected] 1
Department of Mechanical and Automation Engineering, Tshwane University of Technology, Pretoria 0001, South Africa
2
Department of Mechanical Engineering, Landmark University, Omu‑Aran 251101, Kwara State, Nigeria
3
Department of Chemical, Metallurgical and Materials Engineering, Institute for Nano Engineering Research (INER), Tshwane University of Technology, Pretoria 0001, South Africa
4
Department of Chemical, Materials and Metallurgical Engineering, Botswana International University of Science and Technology, 16, Palapye, Botswana
Improvements in the wear and corrosion properties of metal matrix composites, remain a serious challenge in engineering field, especially the moving mechanical assemblies, such as: cutting tools, high temperature dies, turbine blade, heat treatment fixtures and gas/steam turbine hardware [1]. The degree of wear and corrosion resistance modes depends on the inherent properties, such a
Data Loading...
