Formation and reduction of hydrogen porosity during selective laser melting of AlSi10Mg

By C. Weingarten, D. Buchbinder, N. Pirch, Wilhelm Meiners, K. Wissenbach, Reinhart Poprawe. 2015

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Is the energy density a reliable parameter for materials synthesis by selective laser melting? (2017, background): “There are several reasons that may cause the formation of keyhole instabilities such as high cooling rate, insufficient ED, improper laser offset at the power bed [26].”
3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting (2019, methodology): “[159]; according to their study drying the powder before processing reduced porosity by 50% (in agreement with Yang et al.”
Mechanism of keyhole pore formation in metal additive manufacturing (2021, background): “Therefore, massive researches have been conducted to understand the pore formation mechanisms during AM and control the as-built part porosity [8, 9, 10, 11, 12, 13].”
Additive manufacturing of metallic components – Process, structure and properties (2018, background): “81 shows the extreme differences in porosity of AlSi10Mg deposited by PBF-L for different power densities and scanning speeds [629].”
On the formation of AlSi10Mg single tracks and layers in selective laser melting: Microstructure and nano-mechanical properties (2016, background): “As has been illustrated by Weingarten et al. (2015), upon melting the material, moisture (H2O) on the powder surface breaks down into H2 that promotes the formation of hydrogen porosity and oxygen that combines with Al, forming Al2O3.”