Abstract
Normal spectral emissivity measurements at 684.5 nm for two steels and two nickel-based superalloys at the melting transition and in the molten state are reported in this study. The measurements were performed using a division-of-amplitude photopolarimeter on a microsecond time-scale which is part of a resistive pulse-heating experiment. Emissivity results for the investigated steels do not show any apparent correlation whereas the results for the nickel-based alloys are conclusive and may be used as reference values for similar alloys whenever measurements are too time consuming or not feasible. A weakly increasing emissivity with rising temperature was observed in the liquid state for all the investigated alloys which may be taken into account whenever temperatures are optically measured. However, the measurements presented here show that such a correction does not exceed 0.2 % per 100 K and might only be necessary at a metrological level of accuracy.
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Cagran, C., Reschab, H., Tanzer, R. et al. Normal Spectral Emissivity of the Industrially Used Alloys NiCr20TiAl, Inconel 718, X2CrNiMo18-14-3, and Another Austenitic Steel at 684.5 nm. Int J Thermophys 30, 1300–1309 (2009). https://doi.org/10.1007/s10765-009-0604-4
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DOI: https://doi.org/10.1007/s10765-009-0604-4