Investigation on reducing distortion by preheating during manufacture of aluminum components using selective laser melting

By D. Buchbinder, Wilhelm Meiners, N. Pirch, K. Wissenbach, J. Schrage. 2014

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Process defects and in situ monitoring methods in metal powder bed fusion: a review (2017, neutral): “The choice of improper pre-heating settings is a possible cause of residual stress development (Leuders et al., 2013; Edwards et al., 201; Chlebus et al., 2011; Buchbinder et al., 2014).”
Additive manufacturing of metallic components – Process, structure and properties (2018, background): “Preheating of powder also reduced the thermal stress induced distortion in sample cantilever parts of AlSi10Mg built by PBF-L process [270].”
Material-structure-performance integrated laser-metal additive manufacturing (2021, positive): “Essentially, residual stresses during laser AM can be reduced by weakening local thermal gradients in the melt pool, which can be accomplished by (i) preheating the substrate and previously deposited layers (9, 17, 162), (ii) optimizing laser printing parameters to maintain constant melt pool morpho”
Differences in microstructure and properties between selective laser melting and traditional manufacturing for fabrication of metal parts: A review (2015, methodology): “[73] used the preheating method to reduce deformation and improve the forming accuracy.”
3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting (2019, background): “A build-plate is usually heated to aid in heat dissipation by lowering the thermal gradient [27] to avoid part curling due to nonuniform thermal expansion [28].”