Estimation of Spatio-temporal Temperature Evolution During Laser Spot Melting Using In Situ Dynamic X-Ray Radiography

A novel approach to estimate the sub-surface temperature (and thermal gradient) distribution during melting/solidification and its time evolution using in situ dynamic synchrotron X-ray radiography data is proposed in this work. The proposed approach uses the Beer–Lambert’s law as a physical basis and is demonstrated using an in situ laser spot-melting experiment on Ti–6Al–4V alloy. This methodology also incorporates the recipe described previously by Gilbert and Deinert allowing for the extraction of a “radially-resolved” temperature distribution.