Journal ArticleDOI
Rafting in single crystal nickel-base superalloys - An overview
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TLDR
In this article, the effect of stress state on γ/γ′ rafting, kinetics and morphological evolution are discussed with the recent experimental results, and the nature and influence of rafting on creep properties including pre-rafted conditions are discussed.Abstract:
Currently nickel-base single crystal (SX) superalloys are considered for the manufacture of critical components such as turbine blades, vanes etc., for aircraft engines as well as land-based power generation applications. Microstructure and high temperature mechanical properties are the major factors controlling the performance of SX superalloys. Rafting is an important phenomenon in these alloys which occurs during high temperature creep. It is essential to understand the rafting mechanism, and its characteristics on high temperature properties before considering the advanced applications. In this review article, the thermodynamic driving force for rafting with and without stress is explained. The nature and influence of rafting on creep properties including pre-rafted conditions are discussed. In addition, the effect of stress state on γ/γ′ rafting, kinetics and morphological evolution are discussed with the recent experimental results.read more
Citations
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Dynamic compressive behavior of a single crystal nickel-base superalloy at ultra-high temperature: mechanism investigation with a modified electric synchronous SHPB technique
TL;DR: In this article , a modified automatic split Hopkinson pressure bar (SHPB) for measuring the dynamic compressive behavior at ultra-high temperature up to 1700 °C was developed, where a bidirectional electric synchronous assembly system, two high-precision delay controllers and an automatic control mechanism were employed to automate each section in the whole experiment process with high precision and high reliability.
Journal ArticleDOI
Materials for Gas Turbine Engines: Present Status, Future Trends and Indigenous Efforts
Dissertation
Microstructural evolution in coated single crystal Ni-based superalloys
TL;DR: In this paper, the identification of features in the microstructure of Ni-based superalloys which change systematically with time and temperature may allow it to be used as a 'time-temperature'recorder.
Journal ArticleDOI
Simulation of rafting type and stress distribution in nickel-based superalloys with different volume fractions of γ′ phase
TL;DR: In this paper, a volume element is introduced to represent the microstructure of γ/γ′ morphology with periodic boundary conditions to formulate the full mode of the micromechanical analysis.
Molecular Dynamics Study of Creep Deformation in Nickel-based Superalloy
TL;DR: In this article, the authors employed molecular dynamics simulations of Ni-based superalloy to investigate the creep behavior under uniaxial compression test and found that the creep mechanism in Ni/Ni3Al is subject to change on the applied stress depending on the distribution of gamma-prime phases change.
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.
Journal ArticleDOI
Directional coarsening in nickel-base single crystals with high volume fractions of coherent precipitates
Tresa M. Pollock,A.S. Argon +1 more
TL;DR: In this article, the diffusional processes responsible for rafting were investigated on the local scale of the precipitates, with preferential local dissolution of the γ′ and diffusional flow of alloying elements around the periphery of precipitates.