MARTENSITE CONVERSION IN ALLOYS WITH AGING MARTENSITE,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 13, 1965
- Accession Number
- AD0620773
Entities
People
- A. P. Gulayev
- N. I. Karchevskaya
Organizations
- National Air and Space Intelligence Center