The thermal stability of topologically close-packed phases in the single-crystal Ni-base superalloy ERBO/1

Lopez‐Galilea, Inmaculada; Koßmann, Jörg; Kostka, Aleksander; Drautz, Ralf; Roncery, L. Mujica; Hammerschmidt, Thomas; Huth, S.; Theisen, W.

doi:10.1007/s10853-015-9579-7

Cited by 45 publications

(16 citation statements)

References 23 publications

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“…They showed that TCP phases in binary, ternary and multicomponent systems are located in particular regions of the structure map depending on their structure type. Further work 79,80 showed that this method for bulk phases is also relevant for precipitates in a multi-phase alloy, however, knowledge of the local composition of the TCP phase is required in order to apply it.…”

Section: Prediction Of Tcp Phase Formationmentioning

confidence: 99%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy's susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy's mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γʹ rafting behaviour.

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Section: Prediction Of Tcp Phase Formationmentioning

confidence: 99%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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“…Compounds with small differences in atomic volume tend to form χ, A15, and σ phases. Sufficiently large differences in atomic volume of the constituent elements can stabilize Laves or µ phases as observed recently also for experimentally observed multicomponent TCP phase precipitates [58,59]. The associated changes in volume and internal relaxations can be assessed with moments.…”

Section: Atomic-volume Differences In Compounds: V-tamentioning

confidence: 69%

Crystal-Structure Analysis with Moments of the Density-of-States: Application to Intermetallic Topologically Close-Packed Phases

Hammerschmidt¹,

Ladines²,

Koßmann³

et al. 2016

Crystals

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Abstract:The moments of the electronic density-of-states provide a robust and transparent means for the characterization of crystal structures. Using d-valent canonical tight-binding, we compute the moments of the crystal structures of topologically close-packed (TCP) phases as obtained from density-functional theory (DFT) calculations. We apply the moments to establish a measure for the difference between two crystal structures and to characterize volume changes and internal relaxations. The second moment provides access to volume variations of the unit cell and of the atomic coordination polyhedra. Higher moments reveal changes in the longer-ranged coordination shells due to internal relaxations. Normalization of the higher moments leads to constant (A15,C15) or very similar (χ, C14, C36, µ, and σ) higher moments of the DFT-relaxed TCP phases across the 4d and 5d transition-metal series. The identification and analysis of internal relaxations is demonstrated for atomic-size differences in the V-Ta system and for different magnetic orderings in the C14-Fe 2 Nb Laves phase.

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“…us, the microstructural stability, which is related to the mechanical integrity of this component, acquires major technological and scientific interest. So, several experimental and theoretical efforts have been made to predict or estimate the phase evolution of superalloys under different aging conditions [7,[10][11][12]. Other phases like the topologically packed phases (TCP) can frequently appear into the microstructure of Ni-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

“…e continuous formation of these phases is recommended to be avoided on the grain boundaries, although there is little information about it. eir presence in these regions is due to an inadequate choice of processing temperatures or heat treatment of the superalloy to obtain the best mechanical properties [2,11,14,15]. en, the study of phases formation and their evolution is an important issue to be investigated for Ni-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analyses of the Effect of Heat Treatments on the Phase Stability of Inconel 792

Cueto-Rodriguez

Ávila-Dávila

López-Hirata

et al. 2018

Advances in Materials Science and Engineering

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A study about the precipitation and phase stability was carried out in an IN-792 superalloy used as a blade in a gas turbine. Microstructure analysis was conducted experimentally on three different cross sections of the blade designated as high temperature (HT), medium temperature (MT), and low temperature (LT). To identify the HT, MT, and LT sections, a numerical thermal analysis was performed using ANSYS software. To obtain the distribution gradient of temperature in the blade, the real conditions of operation in steady state of the gas turbine were considered. A numerical study about the occurrence of phases in the IN-792 superalloy was carried out with ermo-Calc and TC-PRISMA software. e analysis of the as-cast IN-792 superalloy with Scheil-Gulliver equations permitted to explain the phase formation during the solidification process. e calculated timetemperature-precipitation (TTP) diagram explains consistently the precipitation process observed after two different heat treatment conditions applied experimentally and numerically to regenerate the original microstructure of the IN-792 superalloy. e experimental results were consistent with the calculated isoplethic and TTP diagrams. In terms of accuracy, the further development of the ermo-Calc databases for thermodynamic calculations in superalloys is evident. It was possible to calculate precipitation temperatures and the local evolution of precipitated particles for two different heat treatment conditions.

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The thermal stability of topologically close-packed phases in the single-crystal Ni-base superalloy ERBO/1

Cited by 45 publications

References 23 publications

Formation and effect of topologically close-packed phases in nickel-base superalloys

Formation and effect of topologically close-packed phases in nickel-base superalloys

Crystal-Structure Analysis with Moments of the Density-of-States: Application to Intermetallic Topologically Close-Packed Phases

Numerical and Experimental Analyses of the Effect of Heat Treatments on the Phase Stability of Inconel 792

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