Internal strain evolution of wire and powder additively manufactured 316L during in-situ tensile loading at high temperature

Mechanical behavior analyis in additively manufactured (AM) metallic materials has particular complexity in its interpretation in comparison with components obtained through traditional fabrication routes, which are related to their unusual fabrication conditions including new or non-equilibrium microstructural features and complex residual stress distributions in 3D. The in-situ monitoring of the evolution of internal strain and in particular phase-specific load partitioning paramount to determine the critical influence of the inherent anisotropic nature of AM materials in their evaluation and simulations of service life for structural applications3. To that end, in-situ neutron TOF experiments, where the different hlk families and/or different phases can be followed simultaneously within the bulk and during loading is proposed in this experiment for 316L material obtained through two AM routes: powder - laser bed fusion (L-PBF) and laser-wire directed energy deposition (DED). This work is part of the PhD thesis of Msc A. Mejia and part of the neutron strain method development for high temperature characterization which is aimed in a long term collaboration between SALSA, STRESS-SPEC and ENGIN-X scientists through the Neutron Quality Label ® working group.