Approximation of absolute surface temperature measurements of powder bed fusion additive manufacturing technology using in situ infrared thermography

By E. Rodriguez, J. Mireles, C. Terrazas, David Espalin, Mireya A. Perez, Ryan B. Wicker. 2015

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In-situ sensing, process monitoring and machine control in Laser Powder Bed Fusion: A review (2021, background): “The emissivity of a material is highly dependent on both temperature and wavelength, surface morphology [84] and the oxygen content of the feedstock, and can change when the material is subjected to multiple heating cycles, such as through powder recycling in PBF [85–87].”
In-situ measurement and monitoring methods for metal powder bed fusion: an updated review (2021, unknown): “…or 50 µ m to 750 µ m (Abdelrahman et al 2017, Imani et al 2019a, 2019b), cylindrical voids with diameters in the range 50 µ m to 750 µ m (Abdelrahman et al 2017, Mahmoudi et al 2019, Imani et al 2019a, 2019b) and spherical voids with diameters in the range 600 µ m to 900 µ m (Mireles et al 2015).”
Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM) (2017, unknown): “[28–31] The following boundary conditions were considered for the simulation:  Radiation heat transfer for the top surface (emissivity value: ε=0.26) [32].”
Process defects and in situ monitoring methods in metal powder bed fusion: a review (2017, unknown): “(2014) and Mireles et al .”