Accession Number : AD0712724

Title :   DEVELOPMENT OF A HIGH STRENGTH STAINLESS STEEL WITH IMPROVED TOUGHNESS AND DUCTILITY,

Corporate Author : BOEING CO RENTON WASH COMMERCIAL AIRPLANE DIV

Personal Author(s) : Webster,D.

Report Date : 15 SEP 1970

Pagination or Media Count : 38

Abstract : Compositional modifications were made to the existing Cr-Mo-Co stainless steels to produce a steel (alloy B) which combines the high strength of AFC 77 with the toughness of AFC 260. This was achieved by utilizing both the strengthening effect of grain refinement and the crack stopping ability of retained austenite. After tempering at 800-900F alloy B possesses higher uniform elongation than other high strength stainless steels due to the ease with which its retained austenite transforms under stress to martensite to delay necking. An explanation is advanced for the anomalously low tensile yield strength that occurs in both alloy B and AFC 77 after tempering at 1000F. (Author)

Descriptors :   (*STAINLESS STEEL, MECHANICAL PROPERTIES), AUSTENITE, CHROMIUM ALLOYS, MOLYBDENUM ALLOYS, COBALT ALLOYS, HEAT TREATMENT, GRAIN SIZE

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE