Investigating Process-Structure-Property Relations of Shock Loaded Wrought and Additively Manufactured 304L Stainless Steel

Comparative shock loading experiments were performed to investigate the dynamic response of ingot-derived wrought and additively manufactured (AM) SS304L stainless steel. Experiments looked to study how microstructural properties related to the fabrication process influence compression and release behavior. Sample variants were as-received wrought and as-built AM Z-Cut (build direction), as well as heat treated and recrystallized (1250^oC) wrought and AM Z-Cut SS304L. Samples were loaded under identical loading conditions utilizing a forward-ballistic configuration, and interferometry measurements were performed utilizing photonic Doppler velocimetry (PDV). Impact velocities spanned 0.25-1.50 km/s, resulting in peak compressive stresses of 5-34 GPa. Waveform profiles were analyzed to determine Hugoniot elastic limits (HEL), shock-particle velocity relations, and shock-release measurements. Microstructural attributes, such as, grain size, morphology, and residual stresses are considered to explain similarities and differences in the experimental results.