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        Microtextural Characterization of Additively Manufactured SS316L After Hot Isostatic Pressing Heat Treatment

        Kanwal Chadha,Yuan Tian,John Spray,Clodualdo Aranas 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1

        Microtextural characterization using electron backscatter difraction analysis was performed on laser powder bed fusion manufactured SS316L (SS316L). The crystallographic textures of as-printed (AP) and hot isostatic pressed (HIP) samples havebeen determined using orientation distribution function maps. The AP sample consists of mostly<110>||BD and<100>||BDfber textures without any clear presence of twins. Conversely, the HIP sample featured<110>||BD and<111>||BD grains. The formation of<111>||BD texture was due to the deformation associated with the HIP process. Moreover, HIP generateda signifcant fraction of coincident site lattice Σ3 boundaries due to the low stacking fault energy of SS316L. These twinboundaries allow considerable plasticity during subsequent deformation. The spacing of deformation twins is wider (1–5 μm)compared to the subgrain boundaries (0.2–0.7 μm). Kernel Average Misorientation maps depict the occurrence of dynamicrecrystallization, which is assisted by deformation twinning. The results explain the increased ductility of LPBF-produced,HIP processed SS316L without sacrifce to its tensile strength.

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