Boosting wear properties of Inconel718 superalloy by uniform dispersing graphene nanoplatelets through laser melting deposition

In order to further improve the wear and corrosion resistance, the graphene nanoplatelets composite Inconel 718 alloy (GNPs/IN718 composites) was prepared by laser melting deposition (LMD). The microstructure, wear and electrochemical corrosion resistance of IN718 and composites were studied. The microstructure of composites is M7C3/gamma eutectic, accompanied by (Ti,Nb)C precipitation. The results of Raman and TEM showed that the existence of GNPs in composites. The average microhardness of the GNPs/IN718 composites has increased by 1.125 times (544 HV0.2). GNPs is the lubricating phase during friction process, the coefficient of friction and wear rate of the composites only 68.4% and 7.14% of the IN718 alloy. GNPs/IN718 composites has better corrosion resistance than IN718 alloy. With the increase of power, the further ablation of GNPs leads to the decrease of wear and corrosion resistance. (c) 2020 Elsevier B.V. All rights reserved.