DEVELOPMENT OF COBALT-BASE ALLOYS. Final Report for September 1, 1958- October 31, 1959
The limit of forgeability was found to be at, or slightly beyond. the maximum solid solubility limit for any binary alloy addition to cobalt-base alloys. Alloys of Co with Fe Mn. and Ni were forgeable in all proportions with the limit of forgeability at 15 wt.% Mo Short-time tensile properties for binary alloys at room temperature and 1700 deg F are reported. Binary alloys were strengthened appreciably with additions of Mo. W. and Cr. Ternary alloys containing combinations of Cr Mo. Yb. Ta, Ti, and W produced alloys with short- time tensile strengths of 60.000 to 85.000 psi at 1700 deg F. Significant additions of Si and Cr were found to produce oxidation-resistant complex alloys. Additions of Ti and Nb must be restricted to less than 3 wt.% in most systems if forgeability is to be retained. Additions of 8 wt. % Ta to the base Co- 15 wt.% Mo alloy increas the hightemperature strength while retaining good for lability. (C.J.G.)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- NSA Number:
- NSA-14-011967
- OSTI ID:
- 4172486
- Report Number(s):
- ARF-2131-9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COBALT ALLOYS
FORGING
HIGH TEMPERATURE
IRON ALLOYS
MANGANESE ALLOYS
METALS, CERAMICS, AND MATERIALS
MOLYBDENUM
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM
OXIDATION
PHASE DIAGRAMS
PRESSURE
SILICON
SOLID SOLUTIONS
STABILITY
TANTALUM
TANTALUM ALLOYS
TEMPERATURE
TENSILE PROPERTIES
TITANIUM
TUNGSTEN