Effect of hydrogen on fatigue crack propagation in vanadium
- Univ. of Manitoba, Winnipeg
The influence of hydrogen on fatigue crack propagation in unalloyed vanadium and several hydrogen-charged vanadium alloys has been investigated. The Paris--Erdogan equation, da/dN = C(..delta..K)/sup m/, was approximately obeyed for all alloys. Crack growth rates were lowest in vanadium and dilute vanadium-hydrogen alloys, and were not very sensitive to volume fraction of hydrides in more concentrated alloys. The crack growth exponent, m, is inversely proportional to the cyclic strain hardening rate, n', and the rate constant C is inversely proportional to the square of the ultimate tensile stress, sigma/sub UTS/: metallographic examination showed hydride reorientation and growth in the originally hydrided alloys. No stress-induced hydrides were observed in V-H solid-solution alloys. Fractures in hydrided materials exhibited cleavage-like features, while striations were noted in unalloyed vanadium and dilute solid-solution alloys.
- OSTI ID:
- 6466077
- Journal Information:
- Metall. Trans., A; (United States), Vol. 9:1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fatigue crack growth theory and experiment: A comparative analysis
Effects of hydrogen on fatigue of vanadium and niobium. Annual report
Related Subjects
HYDROGEN
METALLURGICAL EFFECTS
VANADIUM
CLEAVAGE
CRACKS
VANADIUM ALLOYS
FATIGUE
FRACTURES
MICROSTRUCTURE
ALLOYS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FAILURES
FLUIDS
MECHANICAL PROPERTIES
METALS
NONMETALS
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies