Effect of hydrogen on fatigue crack propagation in vanadium

Journal Article · Sun Jan 01 00:00:00 EST 1978 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02647173· OSTI ID:6463966

Chung, D W ^[1]; Stoloff, N S

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1. 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: 6463966
• Journal Information: Metall. Trans., A; (United States), Vol. 9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HYDROGEN
METALLURGICAL EFFECTS
VANADIUM
CRACKS
VANADIUM HYDRIDES
CLEAVAGE
FATIGUE
FRACTURES
ORIENTATION
SOLUBILITY
STRAIN HARDENING
SURFACES
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FAILURES
FLUIDS
HARDENING
HYDRIDES
HYDROGEN COMPOUNDS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NONMETALS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies