Heat Treatment Optimization via Thermo-Physical Characterization of AlSi7Mg and AlSi10Mg Manufactured by Laser Powder Bed Fusion (LPBF)

摘要

The current paper aims at unraveling the threefold interrelationship between process, microstructureand properties of two materials, AlSi7Mg and AlSi10Mg, processed by laser powder bed fusion (LPBF) on a 3DSystems ProX® DMP 320, and subsequently heat treated under different conditions in argon atmosphere. Threethermo-physical characterization techniques were employed to monitor microstructural and concomitantmechanical property changes during heat treatment of LPBF processed Al-Si-Mg based alloys. The evolutionof dissolved Si in the FCC Al matrix was monitored by electrical resistivity (ER) measurements, precipitationreactions were monitored by combining differential scanning calorimetry (DSC) with elastic property anddamping measurements using the impulse excitation technique (IET). The evolution of the microstructure uponheat treatment was linked to characteristic phenomena captured by each of the three thermo-physicalcharacterization techniques. Finally, the evolution of internal and residual stresses of both processed alloysupon heat treatment was monitored via the contour method.