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Title:Hydrogen-enhanced transient creep of 310S and AL 29-4-2 stainless steel
Author(s):Tien, Chee Wain
Doctoral Committee Chair(s):Altstetter, Carl J.
Department / Program:Materials Science and Engineering
Discipline:Materials Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Metallurgy
Engineering, Materials Science
Abstract:Transient creep of hydrogenated 310S and AL 29-4-2 stainless steels at ambient temperatures was studied to determine the effects of hydrogen on plastic deformation. Thin specimens were slowly cathodically charged to uniform hydrogen contents, and no significant damage was introduced. A constant load was then applied while the charging current density remained the same, so as to prevent outgassing of the hydrogen during creep tests. It was found in 310S that at short times the creep rate of a hydrogenated specimen was lower than for a specimen without hydrogen. However, the creep rate decreased at a slower rate thereafter, so that the transient creep stage was longer, and in some cases, the creep strain was even larger than in a hydrogen-free specimen. In AL 29-4-2, the hydrogenated specimen had a higher creep rate than the uncharged specimen from beginning to the end of the creep test. This is clear evidence of hydrogen-enhanced plasticity. Elastic interactions between hydrogen atmospheres and moving dislocations were used to explain the observed phenomenon. Hydrogen-enhancement and localization of plasticity have been cited as fundamental causes of hydrogen embrittlement. The prolongation of the transient creep stage has significance for propagation of stress corrosion cracks.
Issue Date:1994
Rights Information:Copyright 1994 Tien, Chee Wain
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9503337
OCLC Identifier:(UMI)AAI9503337

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