Microstructural variations induced on AISI 304Cu steel disks by explosions which do not cause gross macro-deformation are illustrated. 50 and 100 g NSP explosive spherical charges and explosive-to-target distances in the range from 6.5 to 81.5 cm were used to achieve peak pressures in the 960 to 3 bars range. Two alloy grain sizes (60 and 32 m) were tested. Microstructural features were studied by XRD, OM, SEM and STM microscopy. Surface OM and SEM evidenced partial surface melting, zones with recrystallization phenomena, and intense mechanical twinning. Phenomena in the interior of the samples restricted to twins. They can be seen up to some distance from the explosion impinged surface and again for a smaller distance around the reflecting surface. The maximum charge-to-target distance at which the phenomena disappear has been singled out for each charge and alloy grain size and related to the critical resolved shear stress for twinning.
Firrao, D., Matteis, P., Scavino, G., Ubertalli, G., Ienco, M., Piccardo, P., et al. (2005). AISI 304K steel subjected to small charge explosion: microstructural change with limited or no macro-deformation. In TMS (The Minerals, Metals & Materials Society), 2005 (pp.83-97). Mark E.Schlesinger.
AISI 304K steel subjected to small charge explosion: microstructural change with limited or no macro-deformation
MONTANARI, ROBERTO;TATA, MARIA ELISA;
2005-01-01
Abstract
Microstructural variations induced on AISI 304Cu steel disks by explosions which do not cause gross macro-deformation are illustrated. 50 and 100 g NSP explosive spherical charges and explosive-to-target distances in the range from 6.5 to 81.5 cm were used to achieve peak pressures in the 960 to 3 bars range. Two alloy grain sizes (60 and 32 m) were tested. Microstructural features were studied by XRD, OM, SEM and STM microscopy. Surface OM and SEM evidenced partial surface melting, zones with recrystallization phenomena, and intense mechanical twinning. Phenomena in the interior of the samples restricted to twins. They can be seen up to some distance from the explosion impinged surface and again for a smaller distance around the reflecting surface. The maximum charge-to-target distance at which the phenomena disappear has been singled out for each charge and alloy grain size and related to the critical resolved shear stress for twinning.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
