Accession Number : AD0815014

Title :   COUPLING OF ULTRAHIGH STRENGTH AND FRACTURE TOUGHNESS IN STEELS BY MEANS OF THERMOMECHANICAL PROCESSES.

Descriptive Note : Technical rept. Jan-Dec 66,

Corporate Author : MANLABS INC CAMBRIDGE MA

Personal Author(s) : Kalish, David ; Kulin, S. A.

Report Date : MAY 1967

Pagination or Media Count : 81

Abstract : A series of eleven alloy steels were designed containing nickel, cobalt, molybdenum and chromium (with 0.14 or 0.19% carbon) as the principal alloying elements. Four similar experimental alloys supplied by the Republic Steel Corporation were evaluated in terms of their suitability for applying strain tempering and ausforming treatments. The transformation characteristics of the steels were determined with and without prior austenite deformation. The variables of interest were austenitizing temperature, isothermal transformation temperature and time and cooling rate. The tempering characteristics of the eleven research steels were studied in detail by means of hardness and precracked Charpy impact energy measurements. A limited survey of the ausforming and strain tempering response of these steels was performed. Tensile and fracture toughness properties with selected tempering temperatures were compared for conventionally heat treated, ausformed (50% deformation) and strain tempered (25% deformation) processes.

Descriptors :   (*AUSTENITE, HOT WORKING), (*STEEL, FRACTURE(MECHANICS)), (*MARTENSITE, TENSILE PROPERTIES), TOUGHNESS, HARDNESS, DEFORMATION, QUENCHING, STRAIN HARDENING, TEMPERING, HEAT TREATMENT, IMPACT TESTS, MICROSTRUCTURE, ADDITIVES, NICKEL ALLOYS, COBALT ALLOYS, MOLYBDENUM ALLOYS, CHROMIUM ALLOYS.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE