Influence of hydrogen and test temperature on mechanical properties of vanadium and niobium

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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. ... continued below

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Pages: 26

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Stoloff, N.S.; Ashok, S. & Xiao, P. October 16, 1981.

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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 650/sup 0/C. Fractographic features change from striations in unalloyed metals to cleavage in the hydrided alloys tested at room temperature.

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Pages: 26

Notes

NTIS, PC A03/MF A01.

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  • Other: DE82002148
  • Report No.: DOE/ER/03459-T1
  • Report No.: COO-3459-17
  • Grant Number: AS02-76ER03459
  • DOI: 10.2172/6044270 | External Link
  • Office of Scientific & Technical Information Report Number: 6044270
  • Archival Resource Key: ark:/67531/metadc1097607

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 16, 1981

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 4, 2018, 12:42 p.m.

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Stoloff, N.S.; Ashok, S. & Xiao, P. Influence of hydrogen and test temperature on mechanical properties of vanadium and niobium, report, October 16, 1981; Troy, New York. (digital.library.unt.edu/ark:/67531/metadc1097607/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.