Noncontact Modulated Laser Calorimetry for Liquid Austenitic Stainless Steel in dc Magnetic Field

Fukuyama, Hidetoshi; Takahashi, Keitaro; Sakashita, Shoji; Kobatake, Hidekazu; Tsukada, Takao; Awaji, Satoshi

doi:10.2355/isijinternational.49.1436

Cited by 19 publications

(18 citation statements)

References 19 publications

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“…The densities of the liquid Ni-Al alloys were measured using the apparatus called PROSPECT developed in our group [16][17][18][19][20][21][22]. A schematic diagram of PROSPECT designed for density measurements is given in Ref.…”

Section: Methodsmentioning

confidence: 99%

Containerless measurements of the liquid-state density of Ni–Al alloys for use as turbine blade materials

et al. 2018

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Ni-Al alloys are good candidate materials for the turbine blades of high-efficiency gas turbines. The thermophysical properties of the liquid alloy are required for accurate modeling of the casting process. In this study, the densities of liquid Ni-Al alloys were measured over the entire composition range using the electromagnetic levitation technique under a static magnetic field. Surface oscillation and translational motion of the electromagnetically levitated droplet are suppressed by the static magnetic field, so an accuracy density can be obtained using the technique under a static magnetic field. Before the measurements, the liquidus temperatures of Ni-rich alloys were determined by differential scanning calorimetry. The liquidus temperatures were used as temperature calibration for the density measurements. For all of the compositions, the densities were measured with an experimental uncertainty of less than 1.9%, and they are a linear function of the temperature. The excess volume of the liquid alloys has a minimum value at 50 mol% Ni. The results are discussed from the viewpoint of the thermodynamics. The Ni-Al system shows a large negative excess volume with large negative enthalpy of mixing and excess Gibbs energy.

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Section: Methodsmentioning

confidence: 99%

Containerless measurements of the liquid-state density of Ni–Al alloys for use as turbine blade materials

et al. 2018

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“…relation in the whole range of angular frequency. 9) The value of C P is obtained by substituting the values of c , r , and ÁT ac into eq. ( 2).…”

Section: Heat Capacitymentioning

confidence: 99%

Noncontact Laser Modulation Calorimetry for High-Purity Liquid Iron

Sugie

Kobatake

Uchikoshi

et al. 2011

Jpn. J. Appl. Phys.

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The heat capacity and thermal conductivity of liquid iron were measured the using recently developed method of noncontact laser modulation calorimetry. An iron sample was levitated using an electromagnetic levitator. Then the convection in the levitated droplet was suppressed to measure the thermal conductivity by the application of a dc magnetic field. High-purity iron (99.9972 mass %) prepared using an ion exchange method was used for measurements. The molar heat capacity of liquid iron at constant pressure was measured to be 45.4 ±3.2 J·mol-1·K-1 (1848–1992 K) in low dc magnetic fields because a semi-adiabatic condition was achieved, assisted by the remaining convection in the liquid. The apparent thermal conductivity of liquid iron decreased concomitantly with the increasing dc magnetic field. It finally converged to 39.1 ±2.5 W·m-1·K-1 (1794–2050 K) at 9 T or higher. The experimental uncertainties in the molar heat capacity and thermal conductivity are double the standard deviation.

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“…Numerical simulations have been widely applied not only to conventional processes such as casting [1], crystal growth [2], and welding [3] but To overcome these difficulties, a group led by one of the authors has developed a high-temperature thermophysical property measurement system (PROSPECT) coupled with an electromagnetic levitator (EML) and a superconducting magnet to suppress convection in the liquid [5,6]. Using this facility, the thermophysical properties of high-temperature metallic liquids, such as the density, emissivity, heat capacity, surface tension, and thermal conductivity, can be determined without contamination from contact materials [7][8][9][10][11][12]. In this facility, a single-color optical pyrometer is used for the temperature measurements.…”

Section: Introductionmentioning

confidence: 99%

Emissivity-free radiation thermometry for high-temperature metals using the dual-wavelength reflectance-ratio method

Kobatake¹,

Kurokawa²,

Iwabuchi³

et al. 2022

Meas. Sci. Technol.

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This article describes a preliminary study verifying the applicability of the dual-wavelength reflectance-ratio (DWR) method to emissivity-free radiation thermometry for electromagnetically levitated high-temperature liquid metals. To establish the measurement technique, the DWR method was applied to inductively heated solid spherical Cu and Ni samples. Regardless of the differences in the sample emissivity values, the temperature determined using the DWR method agreed within 20 K with the temperature determined using a thermocouple. It was found that the temperatures of metallic samples having different emissivity values can be determined with a standard uncertainty of 8 K in terms of the absolute temperature when applying the DWR method, even if the sample has curvature and is exposed to high temperatures of up to 1250 K.

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Noncontact Modulated Laser Calorimetry for Liquid Austenitic Stainless Steel in dc Magnetic Field

Cited by 19 publications

References 19 publications

Containerless measurements of the liquid-state density of Ni–Al alloys for use as turbine blade materials

Containerless measurements of the liquid-state density of Ni–Al alloys for use as turbine blade materials

Noncontact Laser Modulation Calorimetry for High-Purity Liquid Iron

Emissivity-free radiation thermometry for high-temperature metals using the dual-wavelength reflectance-ratio method

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