Thermal characteristics such as process temperatures and melt pool sizes offer important information in metal additive manufacturing (AM) technologies such as powder-bed electron beam additive manufacturing (EBAM). In this study, a near infrared (NIR) thermal imager was employed to acquire build surface process temperatures during EBAM fabrications using Ti-6Al-4V powder. Challenges in NIR temperature measurements for EBAM were tackled including compensating temperatures due to the transmission loss and estimating the emissivity of Ti-6Al-4V in its molten state. At a beam speed of about 728 mm/s, a beam current of about 7.2 mA and a diameter of 0.55 mm, the maximum process temperature is on the order of around 2700 °C, and the melt pools have dimensions of about 2.72 mm and 0.72 mm in length and width, respectively.
Temperature Measurements in Powder-Bed Electron Beam Additive Manufacturing
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Price, S, Lydon, J, Cooper, K, & Chou, K. "Temperature Measurements in Powder-Bed Electron Beam Additive Manufacturing." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 2A: Advanced Manufacturing. Montreal, Quebec, Canada. November 14–20, 2014. V02AT02A002. ASME. https://doi.org/10.1115/IMECE2014-36661
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