Mechanical twins in 304 stainless steel after small-charge explosions
Mechanical twins in 304 stainless steel after small-charge explosions
复制标题
小电荷爆炸后 304 不锈钢机械双胞胎
DOI：
10.1016/j.msea.2006.02.036
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Petralia
中科院分区：
文献类型：
--
作者：
D. Firrao;P. Matteis;G. Scavino;G. Ubertalli;M. G. Ienco;G. Pellati;P. Piccardo;M. R. Pinasco;E. Stagno;R. Montanari;M. Tata;G. Brandimarte;S. Petralia
Optical, scanning electron, and scanning tunneling microscopy, as well as X-ray diffraction, were employed to detect microstructural modifications caused in AISI 304Cu steel disks by explosions of small charges placed at close ranges. Explosions induced limited or no gross macro-deformation. NSP (plastic) explosive spherical charges of 54.5 and 109g TNT equivalent mass and explosive-to-target distances in the range from 6.5 to 81.5cm were used to achieve peak pressures in the 160–0.5MPa range. Two alloy grain sizes (60 and 32μm) were tested. Surface optical and scanning electron microscopy revealed partial surface melting, zones with indications of recrystallization, and intense mechanical twinning, which was detected also by X-ray diffraction. In the interior of the samples, twins were exclusively found. They can be seen up to some distance from the explosion-impinged surface and again, at the shortest charge-to-sample distances, in a thin layer around the reflecting surface. For metal object mapping after explosions, an important source of information in forensic science, 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.
