Resistance of Light Gauge (.041 to .046 in) Samples of .070% Carbon Amola Steel to Perforation by Fragment-Simulating Projectiles
Memorandum rept. no. 4
WATERTOWN ARSENAL LABS MA
Pagination or Media Count:
A program of development of improved body armor components is in progress at this arsenal. In conjunction with this program tests have recently been conducted on several light-gauge samples of 0.70 carbon Amola steel. The resistance of a normalized, oil-quenched sample, tempered to 4142 Rockwell C was inferior to that of a normalized, oil-quenched sample tempered to 4951 Rockwell C under impact of standard steel jacketed caliber .45 ball ammunition and that of a sample austempered to 5354 Rockwell C was considerably greater than either. Under impact of the caliber .22 fragment-simulating projectile, G-2, however, the hardest plate offered less resistance than either of the softer plates. The behavior of the austempered samples under impact of the caliber .45 projectile tended to be brittle. The low resistance of all samples of this steel to perforation by projectile G-2 discourages farther consideration of 0.70 carbon Amola steel as a substitute for Hadfield manganese steel which continues to appear supreme as a projectile resistor in the thickness range .040 to .050.
- Metallurgy and Metallography