Grain Boundary Engineering (GBE) involves microstructural optimization via the strategic application of thermo-mechanical metallurgical processing and fabrication steps that increase the fraction of special, low-energy, and degradation-resistant grain boundaries (i.e., structurally ordered low Sigma grain boundaries) in the microstructure. By elevating the fraction of special grain boundaries in a metal or alloy either in the bulk or in the near-surface region, a commensurate improvement in the material properties is achieved owing to the intrinsic degradation-resistance (corrosion, sliding, cracking) of the 'special' grain boundaries. Alloys that can benefit from this treatment include nickel-based superalloys that are used in the hot sections of gas turbine engines. Under increasingly demanding operating conditions, these materials can be vulnerable to grain boundary-related elevated-temperature degradation processes including creep, fatigue, solute segregation, precipitation embrittlement, and intergranular environmental attack. In this study, the benefits of GBE-processing on the reliability and durability of Inconel 718 superalloy are presented and discussed with emphasis on the improvement of its resistance to creep and crack growth.
Grain boundary engineering of superalloys for aerospace engine applications
TMS Annual Meeting & Exhibition, 137 ; 293-298
2008
6 Seiten, 6 Quellen
Conference paper
English
Anwendung in der Luft- und Raumfahrt , Bindefestigkeit , Dauerhaftigkeit , Gasturbine , Grenzflächenstruktur , Inconel , Kornform , Korngrenzenenergie , Korngrenzenseigerung , Korngröße , Korrosionsbeständigkeit , Kriechen (Werkstoff) , Kristallwachstum , Nickelsuperlegierung , Rissausbreitung , thermische Zersetzung , thermomechanische Behandlung , Zuverlässigkeitsvoraussage
Grain boundary engineering of Allvac 718Plus for aerospace engine applications
Tema Archive | 2010
|Superalloys for aerospace by powder metallurgy
Tema Archive | 1981
|British Library Online Contents | 1995
|Machinability of Elongated Coarse Grain Fe-Based Superalloys
British Library Online Contents | 2014
|Cognitive engineering in aerospace applications
NTRS | 1993
|