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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Primary combination of phase-field and discrete dislocation dynamics methods for investigating athermal plastic deformation in various realistic Ni-base single crystal superalloy microstructures
Siwen Gao,Mohan Kumar Rajendran,Marc Fivel,Anxin Ma,O. Shchyglo,Alexander Hartmaier,Ingo Steinbach +6 more
TL;DR: In this article, three-dimensional discrete dislocation dynamics (DDD) simulations in combination with the phase-field method are performed to investigate the influence of different realistic Ni-base single crystal superalloy microstructures on plastic deformation at room temperature.
Journal ArticleDOI
Formative and controlled mechanisms of nano-sized γ′ precipitates with local phase-transition within dislocation networks of nickel-based single crystal superalloys
Wanshun Xia,Xinbao Zhao,Quanzhao Yue,Liang Yue,Jiangwei Wang,Qingqing Ding,Hongbin Bei,Ze Zhang +7 more
TL;DR: In this article, the chemical and structural evolution within dislocation networks are investigated in a nickel-based single crystal superalloy crept under 1373k and 137MPa, where the local region can be divided to two separated parts: gridlines which compose the arrangements of dislocation network and mesh regions as intervals between gridlines.
Journal ArticleDOI
Early stages of decomposition within the γ′ phase of a Ni–Al–Ti model alloy
TL;DR: In this paper, a Ni-8.5Al-5.4Ti model alloy was subjected to a two-step heat treatment resulting in the formation of γ′ precipitates in a γ matrix.
Journal ArticleDOI
Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy
TL;DR: In this article, a single crystal superalloy with initial sample axis 10 deg deviated from [001] was creep deformed at 1273 K (1000 °C) 235 MPa and its triaxial strain/stress state and subgrain defects were studied by neutron diffraction.
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Studies on erosion-corrosion behaviour of plasma sprayed Ni3Al coating in a coal-fired thermal power plant environment at 540°C
TL;DR: In this article, the performance of Ni3Al coating on nickel-and iron-based superalloys has been evaluated by exposing them to the low temperature primary superheater zone of the coal-fired thermal power plant at the temperature zone of 540°C for ten cycles of 100 h duration.
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.