Near surface residual stresses in 316L SLM structures
In recent years additive manufacturing (AM) has evolved from a technology for rapid prototyping and starts to become a matured production process used in several industries. Selective Laser Melting (SLM) technique allows to fabrication of complex structures, which cannot be produced conventionally via subtractive manufacturing methods. The high temperature gradient during the SLM process introduces residual stresses into the produced parts.Therefore, the influence of residual stresses on the mechanical performance of SLM manufactured parts becomes more important. Due to the interaction of the temperature gradients and build geometry, the residual stress fields can be complex and vary in 3D from the surface to the bulk. The characterisation of the through thickness residual stresses is of interest due to the impact on fatigue properties even with post machined surfaces, particularly the near surface stresses. It is proposed to brigde the current gap in reported literature between surface XRD/sub surface synchrotron XRD and typical fully immersed, larger gauge volume neutron measurements to understand the full through thickness residual stresses.
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EVANS Alexander; BRUNO Giovanni; MISHUROVA Tatiana; PIRLING Thilo; Itziar Serrano-Munoz and ULBRICHT Alexander. (2020). Near surface residual stresses in 316L SLM structures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-257
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