Metallurgical Examination of Eighteen Pieces of 25/64 Inch Thick Rolled Homogeneous Armor
WATERTOWN ARSENAL LABS MA WATERTOWN ARSENAL
Pagination or Media Count:
Metallurgical examination of 18 pieces of armor plate 2564-in x 2-in x 8-in cur from heat SCN219-1, rolled by Ford Motor Company and heat treated by Standard Steel Spring Company has been completed. This material spalled badly when tested with cal. .50APM2 ammunition under requirements of AXS-495. The results of this investigation indicae that spalling was due to the presence of segregations of elongated silicate nonmetallic inclusions in the material. This condition was revealed by the torsion test, microscopic examination, and also by woodiness in the fracture test for steel soundness. A woody condition in rolled armor is indicative of poor quality plate and therefore is not desirable in food quality plate.