Effect of Heat Treatment on the Microstructure and Mechanical Properties of LB-PBF AlSi10Mg and Scalmalloy

摘要

Laser beam powder bed fusion (LB-PBF) process is an attractive additive manufacturing (AM) technology that is applicable for numerous metallic alloying systems. Recently, aluminium (Al) alloys such as AlSilOMg and Scalmalloy have received a lot of attention from AM processes because of their promising mechanical properties. This study endeavours to investigate and develop suitable heat treatment processes to optimize the mechanical properties of these Al alloys by LB-PBF and provide a better understanding of their process-structure-property relations. The effects of heat treatments on the microstructure have been studied using optical microscopy as well as microhardness measurements. Furthermore, the uniaxial tensile properties of both alloys have been tested in various heat treatment conditions. LB-PBF Scalmalloy shows a hardening mechanical response relative to its initial as-built (AB) properties while LB-PBF AlSilOMg alloy shows a softening mechanical behaviour as compared with its AB condition.