Measurement and estimation of thermophysical properties of nickel based superalloys

Quested, P N; Brooks, R. F.; Chapman, L.; Morrell, R.; Youssef, Yehia M.; Mills, Kenneth C.

doi:10.1179/174328408x361454

Cited by 127 publications

(92 citation statements)

References 16 publications

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“…For CMSX-10, the measured density at RT agrees very well with a value of q(RT) = 9.05 g cm À3 given by Quested et al. [28] Scaling of the sample radius from RT to the solidus temperature was performed by dilatometer measurements. Results of the relative length change, DL/L o , between RT and T sol are given in Table II.…”

Section: Thermal Analysissupporting

confidence: 83%

“…Published viscosity values for Ni-based superalloys at their liquidus temperatures fall in the range between 5.0 and 8.5 mPa.s as exemplified by e.g., for IN718 [54] and CMSX-4, [55] respectively. Other values are e.g., 7.4, 7.9, and 8.1 mPa.s for TMS75, CMSX-4, and IN-713LC, respectively, obtained by Sato [11] with the oscillating cup …”

Section: A Surface Tensionmentioning

confidence: 99%

“…Other important issues are form filling in near net shape castings, and the prediction of defects such as bubble formation. [6] Due to their technical importance, continuous efforts are undertaken to measure thermophysical properties of Ni-based superalloys in the high-temperature solid [7,8] and in the liquid phase. [9][10][11] Because of the large variety of Ni-based superalloys, predictive models for the values of a variety of thermophysical properties have been developed.…”

Section: Introductionmentioning

confidence: 99%

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Surface Tension and Viscosity of the Ni-Based Superalloys LEK94 and CMSX-10 Measured by the Oscillating Drop Method on Board a Parabolic Flight

Wunderlich

Fecht

Lohöfer

2016

Metall Mater Trans B

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The surface tension and viscosity of the Ni-based superalloys LEK94 and CMSX-10 were measured by the oscillating drop method in a containerless electromagnetic processing device on board a parabolic flight airplane. Surface oscillations were recorded by 150 and 200 Hz frame rate digital cameras positioned in two perpendicular directions and by the inductive coupling between the oscillating sample surface and the oscillating circuit of the radio frequency heating and positioning generator. The surface tension as a function of temperature of LEK94 and CMSX-10 was obtained as r(T) = 1.73 À 4.51 9 10 À4 [T-1656 K (1383°C)] Nm À1 and r(T) = 1.71 À 5.80 9 10, respectively. The viscosity at the liquidus temperatures as 9.8 and 7.8 mPa.s, respectively. In addition, some basic thermophysical properties such as solidus and liquidus temperatures, densities at room temperature, and thermal expansion in the solid phase are reported.

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Section: Thermal Analysissupporting

confidence: 83%

Section: A Surface Tensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Tension and Viscosity of the Ni-Based Superalloys LEK94 and CMSX-10 Measured by the Oscillating Drop Method on Board a Parabolic Flight

Wunderlich

Fecht

Lohöfer

2016

Metall Mater Trans B

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“…As the latent heat of γ to γ transformation is typically around 120 kJ · mol −1 [11] (which has been experimentally checked for both N18 and N19 superalloys), this should produce a precipitation-induced local heating at an approximate rate of 2 K · s −1 , which is a typical cooling rate in the bulk part of a disk.…”

Section: Latent Heat Introduction In the Model And Subsequent Couplingmentioning

confidence: 86%

γ′ precipitation kinetics in the powder metallurgy superalloy N19 and influence of the precipitation latent heat

Perrut

Locq

2014

MATEC Web of Conferences

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Abstract. The N18 superalloy, powder metallurgy processed, is used for high-pressure turbine disks of the Snecma M88 engine and has been extensively studied. The size distribution of its γ precipitates was first modelled in the late 1980's using a binary alloy model [1]. The precipitation model has been recently revised, upgraded in a pseudo-binary alloy model and used in a multi-scale mechanical model for the calculation of the fatigue life in low cycle fatigue conditions [2]. We here present how the new calibration of the pseudo-binary model for the N19 superalloy has been accelerated through the use of the Thermo-Calc R software, its TCNI5 thermodynamic database and its MOBNI2 mobility database. On a more fundamental point of view, the influence of the γ > γ latent heat of precipitation on the microstructural parameters of quenched samples of N18 and N19 has been studied using this same model. We conclude on the very importance of taking into account the latent heat in a coupled thermal-microstructural model for correct numerical simulations of the precipitation process at each point of a superalloy sample or part.

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“…4a-c show a comparison between the measured and calculated CTEs of superalloys IN-738LC and CMSX-4 and also for the bond coat Amdry-995. The experimental measurements of CTEs in the IN-738LC and Amdry-995 samples were made during the current study, and those in CMSX-4 were extracted from the study in [47]. The nominal compositions of the materials are listed in Table 5, which were used as input for the modelling (except Y which was not supported by the thermodynamic database).…”

Section: Resultsmentioning

confidence: 99%

Modelling the coefficient of thermal expansion in Ni-based superalloys and bond coatings

et al. 2016

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The coefficient of thermal expansion (CTE) of nickel-based superalloys and bond coat layers was modelled by considering contributions from their constituent phases. The equilibrium phase composition of the examined materials was determined using thermodynamic equilibrium software with an appropriate database for Nibased alloys, whereas the CTE and elastic properties of the principal phases were modelled using published data. The CTEs of individual phases were combined using a number of approaches to determine the CTE of the phase aggregate. As part of this work, the expansion coefficients of the superalloy IN-738LC and bond coat Amdry-995 were measured as a function of temperature and compared with the model predictions. The predicted values were also validated with the published data for the single-crystal superalloy CMSX-4 and a number of other Ni-based alloy compositions at 1000 K. A very good agreement between experiment and model output was found, especially up to 800 C. The modelling approaches discussed in this paper have the potential to be an extremely useful tool for the industry and for the designers of new coating systems.

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Measurement and estimation of thermophysical properties of nickel based superalloys

Cited by 127 publications

References 16 publications

Surface Tension and Viscosity of the Ni-Based Superalloys LEK94 and CMSX-10 Measured by the Oscillating Drop Method on Board a Parabolic Flight

Surface Tension and Viscosity of the Ni-Based Superalloys LEK94 and CMSX-10 Measured by the Oscillating Drop Method on Board a Parabolic Flight

γ′ precipitation kinetics in the powder metallurgy superalloy N19 and influence of the precipitation latent heat

Modelling the coefficient of thermal expansion in Ni-based superalloys and bond coatings

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