Metal Additive Manufacturing Conference 2018

Within the field of Advanced High Strength Steels (AHSS), high-manganese Transformation- (TRIP) and Twinning-Induced Plasticity (TWIP) steels gained strong commercial interest by their outstanding mechanical properties. Previous studies have been shown that Laser Powder Bed Fusion (L-PBF) is a promising alternative to overcome shortcomings related to conventional processing routes of high-manganese steel. Furthermore, L-PBF offers the possibility to produce complex geometries such as lattice structures. The overall goal of this work is the combination of the deformation mechanisms of high-manganese steel with beneficial mechanical properties of lattice structures (e.g. energy absorption) and adjusting the typical deformation mechanisms of high-manganese steel by powder blends. The deformation mechanisms are modified by adding elemental Al-powder to prealloyed X30Mn22-powder to increase the stacking fault energy. Processing of different powder blends (e.g. X30Mn22Al1, X30Mn22Al2, X30Mn22Al5) and production of specimen (e.g. tensile bars and lattice structure-compression specimens) are used to compare microstructure using OM, SEM, EBSD and EDX and the related mechanical properties.