Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties
Tresa M. Pollock,Sammy Tin +1 more
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TLDR
The chemical, physical, and mechanical characteristics of nickel-based superalloys are reviewed with emphasis on the use of this class of materials within turbine engines as mentioned in this paper, and the role of major and minor alloying additions in multicomponent commercial cast and wrought super-alloys is discussed.Abstract:
The chemical, physical, and mechanical characteristics of nickel-based superalloys are reviewed with emphasis on the use of this class of materials within turbine engines. The role of major and minor alloying additions in multicomponent commercial cast and wrought superalloys is discussed. Microstructural stability and phases observed during processing and in subsequent elevated-temperature service are summarized. Processing paths and recent advances in processing are addressed. Mechanical properties and deformation mechanisms are reviewed, including tensile properties, creep, fatigue, and cyclic crack growth. I. Introduction N ICKEL-BASED superalloys are an unusual class of metallic materials with an exceptional combination of hightemperature strength, toughness, and resistance to degradation in corrosive or oxidizing environments. These materials are widely used in aircraft and power-generation turbines, rocket engines, and other challenging environments, including nuclear power and chemical processing plants. Intensive alloy and process development activities during the past few decades have resulted in alloys that can tolerate average temperatures of 1050 ◦ C with occasional excursions (or local hot spots near airfoil tips) to temperatures as high as 1200 ◦ C, 1 which is approximately 90% of the melting point of the material. The underlying aspects of microstructure and composition that result in these exceptional properties are briefly reviewed here. Major classes of superalloys that are utilized in gas-turbine engines and the corresponding processes for their production are outlined along with characteristic mechanical and physical properties.read more
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Solidification microstructure of directionally solidified superalloy under high temperature gradient
Weiguo Zhang,Lin Liu +1 more
TL;DR: In this paper, the effect of solidification rate on the microstructure development of nickel-based superalloy under the temperature gradient of 500 K·cm−1 was studied.
Journal ArticleDOI
Analysis of structural changes in a gas turbine blade as a result of high temperature and stress
TL;DR: In this paper, the results of the tested turbine rotor blade with the deteriorated end face were presented, showing that the wear of the end face was due to microstructure changes of its airfoil caused by high-temperature creep at uni-axial stress state, known as rafting.
Journal ArticleDOI
Combining Experiments and Atom Probe Tomography-Informed Simulations on γ′ Precipitation Strengthening in the Polycrystalline Ni-Base Superalloy A718Plus
Andreas Kirchmayer,Hao Lyu,M. Pröbstle,Frédéric Houllé,Andreas Förner,Daniela Huenert,Mathias Göken,Peter Felfer,Erik Bitzek,Steffen Neumeier +9 more
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Fatigue performance improvement of laser shock peened hole on powder metallurgy Ni-based superalloy labyrinth disc
TL;DR: In this paper, laser shock peening (LSP) technology is successfully applied to the hole on powder metallurgy (P/M) Ni-based superalloy labyrinth disc in present work and significant 18% increase in high cycle fatigue limit is achieved.
Journal ArticleDOI
Microstructure and creep anisotropy of Inconel 718 alloy processed by selective laser melting
Shi Jingfang,S.A. Zhou,Huihua Chen,G.H. Cao,Alan M. Russell,Z.J. Zhou,Xin Bo Qi,C. Li,G.F. Chen +8 more
TL;DR: In this article, Inconel 718 alloy cylindrical rods with their axes normal or parallel to the building directions were fabricated by selective laser melting (SLM), then homogenized and double aged.
References
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Journal ArticleDOI
Creep resistance of CMSX-3 nickel base superalloy single crystals
Tresa M. Pollock,A.S. Argon +1 more
TL;DR: In this paper, the authors studied the effect of dislocation-free nickel base superalloy single crystals with high volume fractions of the γ′ phase on their deformation and found that the dislocation free precipitates are resistant to shearing by dislocations.
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The precipitation of topologically close-packed phases in rhenium-containing superalloys
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TL;DR: In this article, a third generation Ni-base single-crystal superalloy TMS-75 and its γ/γ " tie line alloys were designed to contain various volume fractions of γ, while the compositions of two individual phases were kept the same.