The Development of Chemical Compositions for 4 1/2 Inch Cast Armor Satisfying the Requirements of the Fibre Fracture Test after Heat Treatment
WATERTOWN ARSENAL LABS MA WATERTOWN ARSENAL United States
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The object of this report is to investigate chemical compositions for use in 4 and 12 inches thick cast armor which will yield a fibrous fracture after a normal quench and temper heat treatment and to evaluate the metallurgical properties of these steels. Summary of results shows 1 Four of the steels investigated fracture in a fibrous manner when water is quenched in a 4 and 12 inch thick plate and tempered to a fairly low hardness. 2 A composition containing 2 chromium and .5 molybdenum possessed insufficient hardenability for 4 and 12 plate when water quenched. The use of at least 2.5 chromium is apparently required for 4 and 12 inch thick armor in this type analysis.