Case-Hardened plate armor and method of making

Details Case-Hardened plate armor and method of making Case-Hardened plate armor and method of making

1988-03-01

1989-08-15

McDowell, Robert

Metal treatment

Stock

Carburized or nitrided

89 3602, 109 78, 148 165, 148 166, 148125, 148902, 428596, 428610, C21D 942

Patent

active

048571199

ABSTRACT:
Case-hardened plate armor disclosed includes a steel plate (14,18) that is heat treated to provide carbonitride surfaces and a tough, ductile core, with the carbonitride surfaces having a toughness of at least 66, and preferably at least 67, on the Rockwell C scale to prevent surface penetration, and with the tough, ductile core being softer than the carbonitride surfaces to prevent brittle fracture. The steel plate (14,18) may be made from either rolled homogenous armor which has a final core hardness in the range of 45 to 50 on the Rockwell C scale, or from high-hard armor which has a final core hardness in the range of 52 to 54 on the Rockwell C scale. The steel plate may be made with holes or may be imperforate depending upon weight requirements. The case-hardening of the steel plate is performed by heating in an atmosphere of nitrogen and carbon, quenching of the heated steel plate, thereafter tempering the quenched steel plate, deep freezing of the tempered steel plate, and subsequently again tempering the steel plate after the deep freezing to provide the hard carbonitride surfaces and the softer but tougher and more ductile core.

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