Nonnegligible Temperature Drop Induced by Thermocouple on Samples in Gleeble Tests
Abstract
:1. Introduction
2. Method
3. Results and Discussion
3.1. Effect of Thermocouples on the Temperature Field of a Sample
3.2. Combined Effect of Sample Material Properties, Thermocouple Material, and Target Temperature on the Sample Temperature Field near the Thermocouple and Correction
3.3. Verification of the Sample Temperature Field in the Vicinity of the Thermocouple
3.4. Discussion
4. Conclusions
- The introduction of the thermocouple caused distortion in the temperature field near the weld point of the sample, which changed the temperature of the measuring point and led to significant systematic temperature measurement errors under certain conditions.
- The magnitude of the error was related to the target temperature, thermal conductivity of the measured sample, and the material and wire diameter of the thermocouple. The greater the thermal conductivity and thermal radiation coefficient of the thermocouple material are, and the larger the wire diameter of the thermocouple wire is, the greater the error it caused. The higher the target temperature and the lower the thermal conductivity of the sample are, the greater the error was. The temperature measurement error of low thermal conductivity samples such as titanium alloys cannot be ignored.
- The temperature measurement error caused by the introduction of the thermocouple can be corrected by a suitable correction formula. Based on the simulation, two commonly used high-temperature thermocouples were proposed, as well as the corresponding error correction methods and formulas for different wire diameters, target temperatures, and materials with different thermal conductivities.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Parameter | Value |
---|---|
Ambient temperature | 25 °C |
Ambient heat transfer coefficient | 0.02 kw/(m2·K) |
Contact heat exchange coefficient | 3 kw/(m2·K) |
Surface radiation coefficient of the sample | 0.7 |
PtRh thermocouple surface radiation coefficient | 0.75 |
NiCr thermocouple surface radiation coefficient | 0.7 |
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Zhao, X.; Ma, Y.; Gao, S.; Li, X.; Yu, D.; Wang, H. Nonnegligible Temperature Drop Induced by Thermocouple on Samples in Gleeble Tests. Metals 2023, 13, 1573. https://doi.org/10.3390/met13091573
Zhao X, Ma Y, Gao S, Li X, Yu D, Wang H. Nonnegligible Temperature Drop Induced by Thermocouple on Samples in Gleeble Tests. Metals. 2023; 13(9):1573. https://doi.org/10.3390/met13091573
Chicago/Turabian StyleZhao, Xiuhong, Yuting Ma, Shuailong Gao, Xuexiong Li, Dejun Yu, and Hao Wang. 2023. "Nonnegligible Temperature Drop Induced by Thermocouple on Samples in Gleeble Tests" Metals 13, no. 9: 1573. https://doi.org/10.3390/met13091573