Metallurgical Examination of Defective Carnegie-Illinois 2-1/4 inch, 60mm, and 21/2 inch Homogeneous Armor Plates.
WATERTOWN ARSENAL LABS MA
Pagination or Media Count:
The armor plate exhibited unsatisfactory ballistic behavior in the PTP test at high obliquities because of the presence of laminations in the zone midway between the surface and center of the plates. Nonmetallic segregations, probably discontinuous stringers, are believed to be the4 cause of these laminations, which are most effectively revealed by the fracture test. Present ballistic specifications do not adequately reveal the presence of poor steel quality which may show up under service conditions where the impacts frequently occur at high obliquities, thus making it mandatory either to incorporate a more selective ballistic test into the specifications or depend upon a fracture test to eliminate poor quality steel.
- Metallurgy and Metallography