Molybdenum in heat resistant nickel-base alloys
The effects of Mo additions on properties of Ni-base alloys containing various amounts of Al and Ti were investigated. It was found that the addition of molybdenum to heat resistant nickel-base alloys substantially increases the solution temperature of gamma ' phase and the amount of it due to the reduction of the solubility of aluminum in the gamma matrix. Replacing chromium, molybdenum is dissolved largely in gamma ' phase. The lattice constant of gamma ' phase increases; the growth rate of gamma ' particles decreases; aging at 760 or 925 deg C increases the hardness at elevated temperatures (up to 955 deg C); the thermal expansion coefficient decreases. The addition of molybdenum to alloys with nickel, chromium, and aluminum substantially reduces the corrosion attack at 870 deg C. In alloys containing titanium along with these elements, molybdenum has a negligible effect. In tests up to 980 deg C molybdenum reduces the damage caused by oxidation.
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-030126
- OSTI ID:
- 4310501
- Journal Information:
- Metal Sci. Heat Treat. (USSR) (Engl. Transl.), v. 15, no. 7-8, pp. 569-571, Journal Name: Metal Sci. Heat Treat. (USSR) (Engl. Transl.), v. 15, no. 7-8, pp. 569-571; ISSN MHTRA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
*NICKEL BASE ALLOYS-- PHYSICAL PROPERTIES
*TITANIUM ALLOYS-- PHYSICAL PROPERTIES
AGING
ALLOTROPY
LATTICE PARAMETERS
MOLYBDENUM ADDITIONS
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
SOLUTION HEAT
VERY HIGH TEMPERATURE