High temperature creep strength is the primary design criterion for refractory metal alloys being considered for application in space nuclear power systems. The strength improvement exhibited by these alloys, which contain a reactive metal component and to which intentional carbon additions have been made, is generally attributed to a reactive metal carbide precipitate. One exception is the tantalum base alloy ASTAR‐811C, where only the dimetal carbide of tantalum has been detected. Melting, primary and secondary working, and heat treatment operations have all been shown to influence the carbide precipitate size/morphology. This paper discusses the various carbide strengthened Group Va and VIa refractory metal alloys, and presents mechanical property data which illustrates the influence of: alloy base, reactive metal/carbon atom ratio, and thermal mechanical processing history, on high temperature creep properties.
Carbide strengthened refractory metals
Proceedings of the tenth symposium on space nuclear power and propulsion ; 1993 ; Albuquerque, New Mexico (USA)
AIP Conference Proceedings ; 271 , 1 ; 93-98
1993-01-10
6 pages
Conference paper
Electronic Resource
English
TUNGSTEN ALLOYS , TEMPERATURE RANGE 1000−4000 K , DISPERSIONS , SPACE POWER REACTORS , REINFORCED MATERIALS , TANTALUM BASE ALLOYS , TITANIUM CARBIDES , ZIRCONIUM CARBIDES , MORPHOLOGY , GRAIN SIZE , NIOBIUM ALLOYS , THERMAL CYCLING , CREEP , MOLYBDENUM ALLOYS , HAFNIUM CARBIDES , REFRACTORY METALS , HEAT TREATMENTS
Carbide Strengthened Refractory Metals
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