Radiation thermometry applied to temperature measurement in the cutting process

Pujana, Joseba; Campo, Leire del; Pérez-Sáez, R.B.; Tello, M. J.; Gallego, I.; Arrazola, P.J.

doi:10.1088/0957-0233/18/11/022

Cited by 71 publications

(31 citation statements)

References 24 publications

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“…8), 10) and 11). As pointed out above, obvious oscillations of normal spectral emissivity appears only at the first several min from the heating start in this work, whereas those reported in the literature 2,[8][9][10][11]14) appeared at very different heating times, typically from several seconds to an hour in the oxidizing surroundings.…”

Section: Strong Oscillation Of the Normal Spectral Emissivitysupporting

confidence: 47%

“…© 2015 ISIJ also by averaging the three pieces of specimens. Furthermore, we can employ the following equation 2) to estimate the temperature uncertainty contributed only by the surface oxidization, ..... (12) Where c2, with a value of 14 388 μm·K, is the second constant of Planck radiation law.…”

Section: Uncertainty Of Normal Spectral Emissivity Andmentioning

confidence: 99%

“…Surface oxidization is always travelling through the whole manufacture processes. Up to now, a great amount of work [2][3][4][5][6] has been made to clarify the effect of measurement angle, surface roughness, and wavelength on the spectral emissivity, whereas little work has been focused on the relationship between the spectral emissivity and the surface oxidization. Even for some common materials such as steel, the effect of surface oxidization on the spectral emissivity is not thoroughly studied, though great temperature measurement errors can sometimes be generated by the surface oxidization at an elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Campo et al 10) in 2006 used a new experimental apparatus to measure the directional spectral emissivity of Armco iron in a controlled atmospheric surrounding, and also briefly evaluated the effect of surface oxidization on the spectral emissivity at the different heating times. Pujana et al 2) in 2007 investigated the spectral emissivity of 42CrMo4 steel over a wide wavelength range at several temperatures, and evaluated the spectral emissivity as a function of heating time. Wen et al 11,12) in 2010 studied the spectral emissivity of several kinds of steels, and briefly evaluated the effect of heating time on their spectral emissivity over the wavelengths ranging from 2.91 to 4.13 μm and temperatures of 700, 800 and 900 K. Shortly after, Wen 13) in 2011 reported the spectral emissivity measurements of a variety of steels, and also briefly discussed the effect of heating time on the spectral emissivity of these steels.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Oxidization on the Normal Spectral Emissivity of Straight Carbon Steel at 800–1100 K in Air

et al. 2015

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This paper studies the effect of surface oxidization on the normal spectral emissivity of straight carbon steel Q235 in air at 1.5 μm over the temperature range from 800 to 1 100 K. For this reason, the normal spectral emissivity of straight carbon steel Q235 is measured at sixteen definite temperatures over a 6-hour heating period. The normal radiance emitted from the specimen is received by an InGaAs photodiode detector. The temperature of specimen surface is measured by the two platinum-rhodium thermocouples. The variation of normal spectral emissivity with the heating time is studied at a given temperature. The variation of normal spectral emissivity with the temperature is evaluated at a definite heating time. The strong oscillation of normal spectral emissivity is discussed, which is affirmed to be connected with the thickness of oxide layer on the specimen surface, and originate from the interference effect between the radiation stemming from the oxide layer on the specimen surface and the radiation coming from the underlying metal substrate. The uncertainty of normal spectral emissivity contributed only by the surface oxidization is about 1.5-7.1%, and the uncertainty of temperature generated only by the surface oxidization is about 1.7-5.8 K. The models between the normal spectral emissivity and the heating time or temperature are evaluated. A simple functional form including the exponential and logarithmic functions can be used to reproduce well the variation of normal spectral emissivity with the heating time at a given temperature, including the reproduction of strong oscillations.KEY WORDS: straight carbon steel Q235; normal spectral emissivity; surface oxidization; oxide layer; oscillation of spectral emissivity.

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Section: Strong Oscillation Of the Normal Spectral Emissivitysupporting

confidence: 47%

Section: Uncertainty Of Normal Spectral Emissivity Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Surface Oxidization on the Normal Spectral Emissivity of Straight Carbon Steel at 800–1100 K in Air

et al. 2015

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“…The pyrometer utilized a single wavelength for measurement, which was deliberately chosen to minimize error (1 mm) [19]. The measurements were corrected for emissivity in the internal software of the pyrometer controller and a value of 0.7 was chosen for emissivity based on evaluation of the literature [20]. Error calculations were performed to quantify the impact of using an incorrect value for the emissivity, and it was shown that at 1600 8C and a wavelength of 1 mm the maximum error was 122 8C (7.7%), while at 1000 8C it was only 56 8C (5.6%).…”

Section: Methodsmentioning

confidence: 99%

Ultrarapid Microwave Synthesis of Superconducting Refractory Carbides

et al. 2009

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Nb1−xTaxC Carbides can be synthesized by high power MW methods in less than 30 s. In situ and ex situ techniques probing changes in temperature and dielectric properties with time demonstrate that the reactions self‐terminate as the loss tangent of the materials decreases. The resulting carbides are carbon deficient and superconducting; Tc correlates linearly to unit cell volume, reaching a maximum at NbC.

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Thermo-mechanical characterization of the Ti17 titanium alloy under extreme loading conditions

Ayed

Germain

Ammar

et al. 2016

Int J Adv Manuf Technol

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International audienceUnderstanding the physics of chip formation in machining operations is often difficult due to the complexity of the phenomena involved, such as the extreme and complex loading conditions that occur in the cutting zone.In order to model the machining process, it is necessary to use a constitutive behavior law that is capable of reproducing as accurately as possible the behavior of the material under these extreme conditions. In this context, this paper presents a study of the mechanical behavior of the Ti17 titanium alloy at high strain rates and high temperatures. This has been achieved by undertaking compression and shear tests over a wide range of strain rates (from 10−1 s−1 to 100 s−1) and temperatures (from 25 to 800 ◦C). The results show that the Ti17 alloy is sensitive to strain rate, especially for strain rates greater than 1 s−1. In addition, the alloy retains good mechanical properties at high temperature (up to 500 ◦C). Based on the experimental results, the parameter of the Johnson-Cook constitutive equation have been identified using the inverse method. Some weaknesses in the model have been highlighted after the identification phase, especially in terms of the m and C parameters. A modification of the model has been proposed

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Radiation thermometry applied to temperature measurement in the cutting process

Cited by 71 publications

References 24 publications

Effect of Surface Oxidization on the Normal Spectral Emissivity of Straight Carbon Steel at 800–1100 K in Air

Effect of Surface Oxidization on the Normal Spectral Emissivity of Straight Carbon Steel at 800–1100 K in Air

Ultrarapid Microwave Synthesis of Superconducting Refractory Carbides

Thermo-mechanical characterization of the Ti17 titanium alloy under extreme loading conditions

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