Metallurgical Examination of Sections from Two 4 Inch Thick Cast Armor Plates Manufactured by Continental Foundry and Machine Company
WATERTOWN ARSENAL LABS MA WATERTOWN ARSENAL United States
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Sections from two plates, cast from the same heat and heat treated identrically behaved altogether differently under ballistic test, one plate failing badly whereas the second was satisfactory. Failure of the poor plate was attributed to poor shock properties as indicated by crystalline fracture and poor impact values. Surface network crack system on both plates, but more pronounced on plate which failed, was severely oxidized indicating that defect formed upon solidification because of a poor mold condition. The poor shock properties of the failing plate are attributed to temper embrittlement.