Experimental 6 inch Thick Cast Armor Program. Heat Treatment of Fracture Blocks from Heats Numbers 9674 and 9702, Produced by General Steel Castings Corporation.
WATERTOWN ARSENAL LABS MA
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Heat treatments conducted at both the General Steel Castings Corporation and the Watertown Arsenal demonstrate that heats 9674 and 9702 lack adequate hardenability to permit complete transformation to martensite throughout 6-in thick sections. Heat treatment of 6-in thick sections produced martensite-bainite aggregates possessing inferior shock resistance in the hardness range of 260-300 Brinell. Both heats have sufficiently low susceptibilities to temper brittleness of 1150 deg. F. and above practically prevents embrittlement. In view of the fact that the 6-in thick sections, the subjects heats cannot be employed because of the inferior properties of nonmartensitic structures at the hardness under consideration. It is accordingly recommended that the present experimental cast armor program be cancelled.
- Metallurgy and Metallography