Fatigue behavior of niobium--hydrogen alloys
- Univ. of Manitoba, Winnipeg, Can.
The effects of hydrogen on room temperature fatigue behavior of niobium were investigated under both high frequency stress control and low frequency strain control conditions, in air. Hydrogen markedly improved the fatigue life in high frequency tests, while low frequency tests resulted in decreased fatigue life with increasing hydrogen content. Notches in hydrogen-charged alloys reduced high cycle life significantly but had little effect on low cycle tests. Fracture surfaces of annealed niobium mainly exhibited striations, with numerous cracks originating at troughs of striated bands in both stress and strain control tests. The fracture mode for alloys with hydrogen in solution was mixed, with striations interspersed with cleavage facets at high frequencies but generally cleavage steps at low frequencies. For the hydrided alloys, distinctive steps of mixed ductile-brittle appearance were revealed under high frequency conditions, but large cleavage facets only were observed for low frequency tests. The results are discussed in terms of the effects of hydrogen on the cyclic strain hardening rate, as well as on fatigue strength and ductility of niobium.
- OSTI ID:
- 6378048
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 9:10; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ANNEALING
CLEAVAGE
CRACKS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FAILURES
FATIGUE
FLUIDS
FRACTURES
HARDENING
HEAT TREATMENTS
HYDRIDES
HYDROGEN
HYDROGEN ADDITIONS
HYDROGEN COMPOUNDS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NIOBIUM ALLOYS
NONMETALS
STRAIN HARDENING
STRESSES
SURFACES