Supply Risk Considerations for the Elements in Nickel-Based Superalloys

摘要: Nickel-based superalloys contain various elements which are added in order to make the alloys more resistant thermal and mechanical stress adverse operating environments jet engines. In particular, higher combustion temperatures gas turbine important, since they result fuel efficiency thus lower CO2 emissions. this paper, a semi-quantitative assessment scheme is used evaluate relative supply risks associated with contained Ni-based superalloys: aluminium, titanium, chromium, iron, cobalt, niobium, molybdenum, ruthenium, tantalum, tungsten, rhenium. Twelve indicators on elemental level four aggregation methods applied obtain risk at alloy level. The for rhenium, molybdenum cobalt found be highest. For three of schemes, spread values different types (as characterized by chemical composition endurance temperature) generally narrow. fourth, namely cost-share’ scheme, gives rise broader distribution values. This mainly due introduction rhenium as component starting second-generation single crystal alloys. resulting appears, however, acceptable engine applications these can endure.