Metallurgical Examination of 2 Inch Cast Armor Manufactured by Continental Foundry and Machine Company
WATERTOWN ARSENAL LABS MA WATERTOWN ARSENAL United States
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This report covers the investigation of 2 in. cst armor 24 plates of varying hardnesses from 217 to 315 Brinell submitted under Office, Chief of Ordnance - Detroit Project 1113. The plates were reasonably sound, but those above 240 Brinell in hardness exhibited low impact strength and crystallinity in the fibre fracture test. Tests indicated that temper embrittlement was involved to a small degree. Experiments on small specimens, however, indicated that the steel would not respond to an ideal heat treatment to yield satisfactory impact properties because of some undetermined steel deficiency.