A comparison of gaseous hydrogen embrittlement, slow-strain-rate hydrogen embrittlement, and stress-corrosion cracking in Ti-8Al-1Mo-1V
Metallographic, fractographic, and acoustic-emission studies have been carried out on the near-..cap alpha.. commercial alloy, heat treated to produce the Widmanstatten structure and in some cases aged to precipitate ..cap alpha../sub 2/. Both aged and unaged material underwent gaseous hydrogen embrittlement (GHE) in approx. 10kPa gaseous hydrogen, failure occurring along the ..cap alpha..-..beta.. interface. Electron-diffraction studies established the presence of a layer of fcc titanium hydride at the fracture surfaces, and acoustic-emission and fractographic observations indicated that propagation was discontinuous. The aged alloy underwent slow-strain-rate hydrogen embrittlement in inert environments and stress-corrosion cracking in 3 pct aqueous NaCl and, in contrast to CHE, failure occurred across the ..cap alpha..-plates in both cases, producing indistinguishable cleavage-like fracture surfaces. Again, titanium hydride was detected at the fracture surfaces and, from acoustic-emission studies, crack propagation appeared to be discontinuous. Based on these observations, it is suggested that the three forms of failure occur by a common mechanism namely by the repeated formation and rupture of the hydride phase.
- Research Organization:
- Univ. of Illinois, Urbana
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6902808
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 12A; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
COHERENT SCATTERING
CORROSION
CRACK PROPAGATION
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON DIFFRACTION
EMBRITTLEMENT
EXPERIMENTAL DATA
FAILURES
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN EMBRITTLEMENT
INFORMATION
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NUMERICAL DATA
SCATTERING
STRAIN RATE
STRESS CORROSION
TENSILE PROPERTIES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM ALLOYS
WIDMANSTAETTEN STRUCTURE