Metal Additive Manufacturing Conference - MAMC 2026

Combining Laser Powder Bed Fusion of Metals (PBF-LB/M) with hot isostatic pressing (HIP) allows a process route that does not has to aim for maximum component density during additive manufacturing. Porosity introduced during PBF-LB/M canbe reduced through subsequent HIP treatment. This allows to combine higher build rates with high component quality and a microstructure optimized by HIP. This study investigates the influence of different initial porosities on the microstructure and mechanicalproperties of PBF-LB/M processed DSS 2205 duplex stainless steel after HIP. For this purpose, specimens are manufactured according to a shell-core approach with a gas-tight shell, while the core density is adjusted by varying the hatch distance or scanningvelocity. The effect of initial porosity on the mechanical performance is examined through tensile and Charpy impact testing. The results are used to evaluate the shell -core principle in combination with HIP post-treatment, and are compared with PM-HIP specimensto assess the mechanical properties.