Investigating intrinsic material properties of additively manufactured materials via laser interferometry

Abstract This study employs laser interferometry to investigate the effects of key L-PBF parameters on the material dynamic response. The microstructural characteristics of AMed materials are directly influenced by process-induced thermal gradients, which impact solidification behavior and defect formation. High frequency laser interferometry enables precise characterization of the material’s dynamic properties. By correlating these properties with processing conditions, we establish quantitative relationships between energy input, melt pool dynamics, and the resultant material structure. Additionally, laser-based dynamic modulus measurements offer a non-destructive approach to evaluating elastic properties and mechanical anisotropy, which are crucial for performance predictions. By integrating laser interferometry with conventional characterization techniques (microstructural investigations, tensile tests and fractographic analysis), we demonstrate a robust methodology for assessing the intrinsic properties of AM materials.