Effect of Nitriding on Surface Characteristics and High Temperature Wear Behaviour of Inconel 718 Superalloy
Tuncay Turan Hasan Guleryuz Huseyin Cimenoglu
AbstractInconel 718 superalloy was nitrided for 10 h in a fluidized bed reactor containing Al2O3 particles as the carrier of the ammonia + nitrogen gas mixture in between 375 and 450°C. The structural characteristics of the nitride layers and the effect of nitriding on high temperature wear properties of Inconel 718 superalloy were investigated. A significant increment in surface hardness (from 495 to 1735 HV) was achieved after nitriding treatment carried out at 400 °C. The applied nitriding treatment led to formation of a nitrogen enriched surface layer exhibiting superior wear resistance at 600 °C when compared to untreated state of the Inconel 718 superalloy.