The Influence of Explosive-Driven 'Taylor-Wave' Shock Prestraining on the Structure/Property Behavior of 304 Stainless Steel

摘要

The mechanical response of high-explosive (HE)-driven "Taylor-wave" (TW) shock-prestrained 304 stainless steel loaded to 35 to 45 GPa has been investigated in compression and tension at room temperature and compared to results from compressive testing of the annealed microstructure at a strain rate of 10~(-3)/s. The microstructure and substructure evolution due to TW shock prestraining has been investigated using optical metallography and transmission electron microscopy. The mechanical behavior of 304 stainless steel following explosive shock prestraining is shown to exhibit a factor of 2 increase in yield stress and a significant reduction in ductility under tension. Microstructural analyses reveal a high density of twins after TW prestraining and very little production/retention of deformation-induced martensite. The current experimental results are shown to agree well with previous literature results on stainless steel samples shock-prestrained utilizing "square-topped" (ST) shock-pulse loading. This finding suggests that the peak shock pressure, which controls the total plastic strain that the sample must accommodate, is the dominant variable in shock-wave-loading defect generation and storage in 304 stainless steel.