Optimization of Fe/Cr/C base structural steels for improved strength and toughness
Optimization of the composition and the heat treatments to provide a microduplex structure of dislocated-autotempered lath martensite and thin film retained austenite for good combinations of mechanical properties has been attained for Fe/Cr/C base steels. Substituting 0.5 wt pct Mo to reduce Cr from 4 pct to 3 pct did not affect the microstructures nor the properties. It was found that ai melting as compared to vacuum melting does not cause deterioration of toughness in Mn containing alloys but does so in Ni containing alloys. Tempered martensite embrittlement was confirmed as being due to the decomposition of retained austenite. Further improvements in the fracture toughness are achieved b double heat treatments which provide grain refinement. These alloys are considered to be very promising for structural applications.
- Research Organization:
- Molecular Research Division, Lawrence Berkeley Laboratory and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5785329
- Journal Information:
- Metall. Trans., A; (United States), Vol. 13A
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON STEELS
HEAT TREATMENTS
MECHANICAL PROPERTIES
CHROMIUM STEELS
IRON BASE ALLOYS
AUSTENITE
DECOMPOSITION
EMBRITTLEMENT
FRACTURE PROPERTIES
MANGANESE
MARTENSITE
MELTING
MICROSTRUCTURE
MOLYBDENUM
NICKEL ALLOYS
OPTIMIZATION
TECHNOLOGY UTILIZATION
TEMPERING
THIN FILMS
ALLOYS
CARBON ADDITIONS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
FILMS
IRON ALLOYS
METALS
PHASE TRANSFORMATIONS
STEELS
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties