Accession Number : AD0620773

Title :   MARTENSITE CONVERSION IN ALLOYS WITH AGING MARTENSITE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gulayev,A. P. ; Karchevskaya,N. I.

Report Date : 13 AUG 1965

Pagination or Media Count : 9

Abstract : Molybdenum reduces, and cobalt increases the martensite interval in alloys Fe plus 20% Ni. The investigated alloying elements affect the martensite interval in the system Fe - 20% Ni in the same way as in steel. Since before the aging the alloys should have a martensite structure (aging effect is due to processes taking place in alpha-phase), then the content of molybdenum, sharply decreasing the martensite point should be limited to 3% (if no cold treatment is used). In the presence of cobaltelement increasing martensite points, the content of molybdenum can be increased to 5%. The positive role of cobalt in alloys of this type apparently lies in the fact, that the addition of cobalt allows one to increase the content of molybdenum in the alloys. Hardness of annealed (not aged) alloy does not depend upon the ratio of austenite and martensite. Evidently, hardness of carbonless unaged martensite practically coincides with the hardness of the initial austenite. In the investigated alloys hardness cannot serve as a criterion of the degree of hardening. (Author)

Descriptors :   (*IRON ALLOYS, MARTENSITE), (*HEAT TREATMENT, IRON ALLOYS), (*MARTENSITE, HEAT TREATMENT), NICKEL ALLOYS, CARBON ALLOYS, MOLYBDENUM ALLOYS, COBALT ALLOYS, TITANIUM ALLOYS, AGING(MATERIALS), HARDNESS

Distribution Statement : APPROVED FOR PUBLIC RELEASE