Texture evolution during high strain-rate compressive loading of maraging steels produced by laser powder bed fusion

Abstract

Dynamic mechanical behavior and texture evolution in maraging steels, manufactured using the laser powder bed fusion (LPBF) technique, was investigated at strain rates of 2000 s −1 , 2300 s −1 , 3200 s −1 for the as-built samples, and 650 s −1 , 680 s −1 , 950 s −1 for the heat-treated samples. Split-Hopkinson Pressure Bar (SHPB) was used for high strain rate compression tests. The texture of the deformed samples was measured using the electron backscattering diffraction (EBSD) technique. A strong strain rate dependence on the crystallographic texture of as-built LPBF-maraging steel samples was observed. However, strain rate does not have any significant effect on texture evolution in the heat treated maraging steel samples. • Maraging steels rod samples were produced using laser powder bed fusion technique (LBBF) and subjected to heat treatment at 490 °C for 6 h. • High strain rate compressive behavior of LPBF-maraging steel samples in as-built and heat treat conditions were investigated by Split Hopkinson pressure bar apparatus. • Texture of deformed as-built and heat-treated samples were studied by electron backscattering diffraction technique (EBSD) where significant texture development in as-built samples was observed and no texture change for heat-treated samples was seen.