Effects processing parameters and building orientation on the microstructural and mechanical properties of AlSilOMg parts printed by selective laser melting

SYNOPSIS The mechanical properties and microstructure of AlSilOMg alloy samples that were printed by selective laser melting (SLM) studied to determine the effect processing parameters building orientation. After printing, was stress relieved at 250°C for 2 hours. microstructures analysed optical microscopy scanning electron (SEM) phases distribution. Phase transformation characteristics material evaluated using differential calorimetry (DSC). Mechanical determined subjecting XY- Z-built tensile nano-indentation testing. from tests then used perform fractographic analysis SEM. microstructural in each orientation revealed a non-homogeneous which characterized semi-elliptical tract fine silicon precipitates, found be softer along fusion zone. DSC thermograms underwent two phase transformations during first heating cycle. higher UTS, yield strength, lower percentage elongation Z than XY Fractographic showed crack initiation both orientations started surface brittle manner due flows, propagated via microvoid coalescence. Keywords: AlSi10Mg alloy, additive manufacturing, propeerties, microstructure.