Influence of hydrogen and test temperature on mechanical properties of vanadium and niobium
Description
The influence of hydrogen on fatigue life of niobium and vanadium is described. In tests carried out under stress control conditions on unnotched material hydrogen extends fatigue life of both metals. However, in stress controlled tests on notched bars and in strain control tests on unnotched bars hydrogen is detrimental to fatigue life. Hydrided alloys are much more sensitive to notches than are the unalloyed metals. Frequency effects on fatigue life also are much more severe in hydrided alloys, lower frequency leading to shorter life. The results of delayed failure, creep tests and elevated temperature fatigue tests also are reported. Niobium and vanadium reveal reduced fatigue lives at elevated temperatures for tests carried out in vacuum. The results of limited hold time and low frequency tests on strain controlled fatigue life also are reported. Increasing hold time increases fatigue life of niobium in the range 450 to 6500C. Fractographic features change from striations in unalloyed metals to cleavage in the hydrided alloys tested at room temperature
Availability note (English)
MF available from INIS under the Report Number; Available from NTIS., PC A03/MF A01.
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Additional details
Publishing Information
- Imprint Pagination
- 26 p.
- Report number
- DOE/ER/03459--T1
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 13664044
- Subject category
- S36: MATERIALS SCIENCE; S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- FATIGUE; FRACTURES; HIGH TEMPERATURE; HYDROGEN; NIOBIUM; VANADIUM
- Descriptors DEC
- ELEMENTS; FAILURES; MECHANICAL PROPERTIES; METALS; NONMETALS; TRANSITION ELEMENTS
Optional Information
- Secondary number(s)
- COO--3459-17.