|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Analytical Predictions and Experimental Observations of Melt Pool Geometry in Laser Powder Bed Fusion
||Kevin Graydon, Nathalia Diaz Vallejo, Le Zhou, Holden Hyer, Brandon McWilliams, Kyu Cho, Yongho Sohn
|On-Site Speaker (Planned)
Temperature distribution and dimensions of the melt pool associated with various processing conditions during laser powder bed fusion were analytically calculated using the Rosenthal equation for metallic alloys based on iron, aluminum and magnesium. Temperature-dependent material properties such as thermal conductivity, specific heat and thermal diffusivity were taken into account for the calculations. Changes in temperature distribution, cooling rate and melt pool dimensions were examined as functions of laser power, scan speed and absorptivity. Results from calculations were compared to experimental observations from the bulk alloy (i.e., laser single track study) and powder bed fusion. The melt pool widths calculated analytically agreed well with the experimental measurements, while the melt pool depths were generally underestimated. Assumptions inherent in the calculations and changes in materials properties were examined to understand this difference, and to further develop this simple analytical approach to better elucidate the laser-materials (or powder bed) interaction.