Metallurgical Examination of Flame Hardened Gun Shield Manufactured by Continental Foundry & Machine Company.
WATERTOWN ARSENAL LABS MA
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Metallurgical examination was made on a 5 in. thick section of a flame hardened gun shield produced by the Continental Foundry Machine Co. from Heat No. 6479, Pattern E-6180, Serial 504 and four 3 in. thick flame hardened cast plates manufactured by the same company. All flame hardened pieces had poor metallurgical properties. The fact that a 3 12 in. thick section of the flame hardened gun shield had the ability to cause breakage of the 75mm AP M72 projectile may have been due to impacts at appreciable obliquity. A minimum of breakage was noted when the 3 in. thick flame hardened plate was tested with these projectiles at 0 obliquity. Under the attack of undermatching uncapped and capped 37mm AP projectiles, 3 in. thick falme hardened cast plate offers greater resistance to penetration than 3 in. thick homogeneous plate. No correlation was made between the poor metallurgical properties of the flame hardened gun shield and the ballistic tests.
- Metallurgy and Metallography