Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Pulse Heating Techniques

Basak, D; Overfelt, Ruel A.; Wang, D.

doi:10.1023/b:ijot.0000004101.88449.86

Cited by 57 publications

(21 citation statements)

References 7 publications

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“…Cp and enthalpy data have been reported for CMSX4, 10,11) IN718, [8][9][10] IN 600 and Nimonic 75, 12) IN 625 and Hastelloy X, 13,14) CMSX10, IN738, CM186 LC and Rene 80 7) . Cp values for the liquid phase have been reported for IN718, IN738, CMSX4, CMSX10, CM186LC and Rene 80.…”

Section: Databasementioning

confidence: 99%

Calculation of Thermophysical Properties of Ni-based Superalloys

Mills

Youssef

et al. 2006

ISIJ Int.

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Reliable thermophysical data of Ni-based superalloys are needed for the mathematical modelling of solidification in casting applications. This paper derives equations and procedures to calculate the following properties of these alloys from chemical composition of the alloy: the gЈ phase content, liquidus and solidus temperatures, density and thermal expansion coefficient, heat capacity and enthalpy, electrical resistivity, thermal diffusivity and conductivity, viscosity, surface tension and contact angle. Estimates are also for the diffusion coefficient and emissivity. This work has revealed an urgent need for reliable property measurements on liquid Ni-based alloys for the following: heat capacity, electrical resistivity, thermal diffusivity and conductivity, emissivity and diffusion coefficients.

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Section: Databasementioning

confidence: 99%

Calculation of Thermophysical Properties of Ni-based Superalloys

Mills

Youssef

et al. 2006

ISIJ Int.

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“…Electrical resistivity data have been reported for CMSX 4 and Nimonic 901 (300-1 470 K), 13) Inconel 625 (320-1 270 K), 10) IN 718 (300-900 K), 9,14) (300-1 200 K) 15) and (920-2 000 K), 9) (340-1 300 K), 7) Nimonic 75, 80, 90, 95, 100 and 105 (320-1 070 K), 16) Hastelloy X (320-1 470 K), 11) Nimonic 75 and IN 600 (300-1 070 K), 4) Inconel and Inconel X.…”

Section: Databasementioning

confidence: 99%

The Effect of Aluminium Content on Thermophysical Properties of Ni-based Superalloys

Mills

Youssef

2006

ISIJ Int.

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Ni 3 Al is the principal component in the gЈ phase formed in Ni-based superalloys but Ni 3 Cr and Ni 3 Fe can also contribute to the gЈ phase at temperatures below 820 K. Approximate values for the gЈ phase content can be derived from a relationship based on (mass% Al). In a previous publication it was shown that the density in both the solid and liquid alloys was dependent upon the gЈ phase (or Al) contents in the alloy. Consequently, the effect of the gЈ phase on other thermophysical properties (C p , enthalpy, electrical resistivity, thermal conductivity and diffusivity) have been investigated. Linear relations were found between the property values around 300 K and the mass% Al. It was also found that property-temperature relationships were also affected by the gЈ phase (or Al) contents. Although it is known that the strong bonding between Ni and Al atoms affects the density of liquid alloys, we were unable to establish any such relationship for the other properties for liquid alloys because of the large experimental uncertainties in the measurements of these properties. This study has revealed that there is an urgent need for accurate values for C p , electrical resistivity, thermal diffusivity and conductivity for liquid, Ni-based superalloys.KEY WORDS: Ni-based superalloys; gЈ phase; heat capacity; enthalpy; electrical resistivity; thermal conductivity; thermal diffusivity. structural factors in the alloy when compared with other properties. Consequently, it would be expected that other properties may be affected by the gЈ phase content. In this paper we examine the effect of gЈ phase (via the Al content) on other thermophysical properties for solid and liquid Ni-based superalloys. Database and Treatment of DataThermophysical property data have been reported for a number of Ni-based superalloys; the chemical compositions for these alloys are given in Table 1.In this paper all temperatures are expressed as thermody- 3. Thermal Expansion Coefficient (a a ) and Density (r r )The density and the linear thermal expansion coefficient (a) were found to be functions of the gЈ phase content (or Al content).3) The difference in density, Dr 296 ϭr 298 meas Ϫ r 298 ideal , was found to increase with increasing gЈ phase and/or Al contents, (Eqs. (4) and (5), respectively). The thermal expansion coefficients for solid alloys were found to decrease with increasing gЈ phase or Al content as can be seen from Fig. 2. Thermal expansion data were collated and divided into three groups based on the Al content, namely, (0-0.5 mass%), (3-4 mass%) and (5-5.8 mass%). Vol. 46 (2006) The mean values for each group were determined and are shown in Fig. 2. It can also be seen from this figure that the slope of all three curves flatten around 870 K and that the coarsening and dissolution of the gЈ phase is accompanied by an increase in slope for the alloys with high gЈ content (CMSX 4 and Rene 80). Heat Capacity (C p ) and Enthalpy (H T ؊H 298 )The enthalpy and C p are not particularly sensitive to structure and consequently, Kopp's...

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“…They derived an empirical equation, from electromagnetic theory, to determine the total hemispherical emissivity based on electrical resistivity 14,15 and temperature of the metal. Total emissivity is then obtained from the ratio of the total power radiated by a metal to the total power radiated by a blackbody.…”

Section: A Experimental Results Of Uniform Sheet Temperature Obtainementioning

confidence: 99%

Measurement of surface temperature and emissivity of different materials by two-colour pyrometry

Raj

Prabhu

2013

Review of Scientific Instruments

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An experimental investigation is performed to substantiate the capability of a charge coupled device camera to measure local temperature and emissivity of different materials heated to temperatures above 500 °C by two-colour pyrometric technique using colorimetric method. Materials investigated are Inconel 718 with pyromark (high temperature paint), Inconel 718, stainless steel SS 304 and SS 316. Centerline temperature and emissivity distribution is obtained for target plates maintained at constant temperature by AC heating while complete temperature and emissivity distribution is provided for plates heated by flame impingement. The obtained results are compared with a calibrated infrared camera and thermocouples and the temperature distribution is found to be in close agreement. These results pertain to partially oxidized metal alloys covered in this study. Deviation in the measurement of emissivity can be attributed to its dependence on wavelength range, oxidation, and sensitivity of the image detector.

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Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Pulse Heating Techniques

Cited by 57 publications

References 7 publications

Calculation of Thermophysical Properties of Ni-based Superalloys

Calculation of Thermophysical Properties of Ni-based Superalloys

The Effect of Aluminium Content on Thermophysical Properties of Ni-based Superalloys

Measurement of surface temperature and emissivity of different materials by two-colour pyrometry

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