Investigation into Synchronous Measurement of Emissivity and Temperature during Alloy Phase Transformation Based on Multi-Wavelength Theory

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Abstract
In the smelting and processing of alloys, the precise control of temperature is highly dependent on non-contact radiation temperature measurement technology, and spectral emissivity is the core parameter that determines the measurement accuracy of this technology. In this study, electromagnetic suspension devices were used to conduct multi-period suspension melting experiments on four alloys. Aiming at the problem that the emissivity is unknown and varies dynamically with time during the phase transition of alloys, an unconstrained algorithm based on spectral wavelength response band differential analysis is proposed, and then the dependence of spectral emissivity on wavelength and temperature of four alloys (304, 316, Inconel 600, and GH3030) is systematically studied. The results show that in the solid state, the emissivity of the alloy increases with the increase in temperature. In the molten state, the correlation between emissivity and temperature is weak. In addition, unlike the monotonous decrease in emissivity of pure metals with wavelength, the emissivity of alloys shows a non-monotonic trend. The comparison of measurement and simulation results verifies the reliability of the emissivity inversion results and shows that the unconstrained algorithm provides an effective new way to accurately obtain the true temperature and emissivity of the alloy.

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