Effects of hydrogen and temperature on fatigue of vanadium. Annual report. [132, 400, 1000 ppM H]
Fatigue behavior of vanadium unalloyed and alloyed with 132, 400, and 1000 ppM hydrogen were determined in both stress control and strain control at room temperature. In addition, stress-control tests were conducted on vanadium and the 1000 ppM H/sub 2/ alloy at 400 and 600/sup 0/C in air. S-N data from stress-controlled tests revealed a pronounced improvement in fatigue life for hydrided vanadium, but little or no effect for 132 ppM H/sub 2/ in solution. Similarly, strain-control tests showed no effects of hydrogen in solution on either cyclic hardening or fatigue life, in marked contrast to previous results for vanadium containing hydride particles. High-cycle fatigue tests on vanadium and the V-1000 ppM H/sub 2/ alloy at room temperature as a function of test frequency showed a marked decrease in life for decreasing frequency for the alloy, but little effect for vanadium. These results furnish an explanation for previously reported anomalies between fatigue lives obtained in stress and strain control tests. Additional tests run as a function of oxygen content in low hydrogen alloys show that varying oxygen levels cannot account for observed changes in properties with hydrogen. Transmission microscopy was utilized to demonstrate differences in fatigue substructures obtained with hydrogen content. 6 figures.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, N.Y. (USA)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- OSTI ID:
- 7263958
- Report Number(s):
- COO--3459-10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
FATIGUE
FLUIDS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
NONMETALS
OXYGEN
QUANTITY RATIO
RESEARCH PROGRAMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM
VANADIUM COMPOUNDS
VANADIUM HYDRIDES