This analysis demonstrates how different scanning strategies affect tensile properties in duplex steel parts, suggesting improved outcomes through optimized porosity levels.
Laser powder bed fusion (PBF-LB) is an effective technology for producing components with complex geometries. However, PBF-LB faces challenges in high-volume production due to long process times. In addition, pores and bonding defects reduce mechanical reliability. A potential solution to enhance productivity and reliability is to combine PBF-LB with hot isostatic pressing (HIP) in the so-called shell-core approach. This method accelerates PBF-LB by intentionally increasing porosity which is then densified by HIP. There are various strategies that can be employed to increase the build-up rate and thereby introduce increased porosity. These different strategies and the different formation of porosity may result in different mechanical properties after HIP. Therefore, the present study aims to investigate the influence of different scanning strategies (variation of hatch distance and scanning velocity) in the PBF-LB process on the tensile properties of DSS2205 duplex stainless steel after post-densification by high-pressure heat treatment (HPHT™).
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Koob et al. (2025) studied this question.
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