Carnegie Mellon University Builds Melt Pool Thermal Radiation Reflection Model, Reducing CFD Temperature Deviation from 15% to 4-6%

A team at Carnegie Mellon University has developed a simulated thermography method to address the distortion of melt pool surface temperature measurements caused by thermal radiation reflection in L-PBF. The study shows that without considering reflection, the CFD deviation for 316L steel melt pool centerline temperature can be as high as 15%, which drops to 4-6% after reflection correction. Using longer imaging wavelengths can further reduce reflection effects. This method provides a more rigorous validation tool for controlling keyhole porosity and powder feedstock composition, and can be extended to applications requiring high-temperature surface temperature measurement, such as imaging of aviation high-temperature turbine blades and concentrated solar power.