Joint Development of a Fourth Generation Single Crystal Superalloy
By S. Walston, A. Cetel, R. MacKay, K. Ohara, D. Duhl, R. Dreshfield. 2004
202 citations recorded by the source corpus.
Abstract A new, fourth generation, single crystal superalloy has been jointly developed by GE Aircraft Engines, Pratt & Whitney and NASA. The focus of the effort was to develop a turbine airfoil alloy with long-term durability for use in the High Speed Civil Transport. In order to achieve adequate long-time strength improvements at moderate temperatures and retain good microstructural stability, it was necessary to make significant composition changes from 2 nd and 3 rd generation single crystal superalloys. These included lower chromium levels, higher cobalt and rhenium levels and the inclusion of a new alloying element, ruthenium. It was found that higher Co levels were beneficial to reducing both TCP precipitation and SRZ formation. Ruthenium caused the refractory elements to partition more strongly to the γ’ phase, which resulted in better overall alloy stability. The final alloy, EPM-102, had significant creep rupture and fatigue improvements over the baseline production alloys and had acceptable microstructural stability. The alloy is currently being engine tested and evaluated for advanced engine applications.
Subfields: Aerospace Engineering, Biomedical Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/82b145d720bdddbf133e31c8d3bb65bc6edf1ed5
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Citations in the corpus
- Development of strong, oxidation and corrosion resistant nickel-based superalloys: critical review of challenges, progress and prospects (2018, background): “Neural network model prediction of the effect of Co and Re on TCP after a 1093°C/1000 h exposure [40].”
- Formation and effect of topologically close-packed phases in nickel-base superalloys (2017, background): “Data taken from Walston et al. 27 , Ofori et al. 29 , Han et al. 30 and Reed et al. 31 Other proposed mechanisms for TCP suppression include: the destabilisation of γʹ at higher temperatures such that the resulting lower volume fraction of γʹ leads to a reduced supersaturation of TCP-forming element”