Since the development of the Nimonic1 alloys for Sir Frank Whittle’s first jet engine, Henry Wiggin Ltd, now part of Special Metals Corporation, has been involved with the design and improvement of nickel alloys for aerospace engineering. Whilst much of this work continues to be in relation to alloys for the high strength/high temperature applications of turbine blades, discs, seals, rings and casings of aero engines, nickel alloys are being utilised for other key aerospace engineering areas such as tooling for composite manufacture. The focus of this paper is on four recent developments in nickel alloys for aerospace engineering, namely: disc alloys; low expansion superalloys; Inconel alloy 718SPF – a nickel base superalloy capable of being superplastically formed; Nilo (low expansion alloys) for composite tooling.
Rigorous control of the annealing practice and certain alloying elements can directly influence key characteristics which aid in optimizing low cycle fatigue (LCF) properties of INCONEL® alloy 617. These procedures favorably influence grain size, carbide microstructure and mechanical properties. It is shown how an optimum combination of these procedures can greatly improve LCF properties of alloy 617 sheet.
Melt practice, rigorous control of certain alloying elements and annealing practice can directly influence key characteristics which aid in optimizing LCF properties of INCONEL@ alloy 625. These procedures can favorably influexe grain size, inclusion types and count and mechanical properties. It is shown how an optimum combination of these procedures can greatly improve LCF properties of alloy 625.
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