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Fatigue of 1018 steel in hydrogen

Authors :
Lo, S. H
Johnson, H. H
Source :
Scripta Metallurgica. 20
Publication Year :
1986
Publisher :
United States: NASA Center for Aerospace Information (CASI), 1986.

Abstract

Tests are performed at different hydrogen pressures and mechanical load parameter values (applied load, stress concentration factor, applied load frequency) to study enhanced fatigue crack growth in SAE 1018 steel. Oxygen was introduced as a hydrogen-oxygen gas mixture environment in order to compare the role of oxygen in crack inhibition with that previously reported for both static and cyclic loading of higher strength steels. In a number of experiments, a thin film of palladium was applied to the specimen surface to facilitate the study of steel-hydrogen interaction in the absence of any surface impedance to hydrogen entry. The kinetics of the diffusing atoms are found to be influenced by the stress field around the notch tip and the applied frequency. An increment in environmental effect occurred when applied load or stress concentration factor was increased.

Subjects

Subjects :
Metallic Materials

Details

Language :
English
ISSN :
00369748
Volume :
20
Database :
NASA Technical Reports
Journal :
Scripta Metallurgica
Publication Type :
Report
Accession number :
edsnas.19860037741
Document Type :
Report
Full Text :
https://doi.org/10.1016/0036-9748(86)90216-4