Hydrogen-enhanced transient creep of 310S and AL 29-4-2 stainless steel
Tien, Chee Wain
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https://hdl.handle.net/2142/20408
Description
Title
Hydrogen-enhanced transient creep of 310S and AL 29-4-2 stainless steel
Author(s)
Tien, Chee Wain
Issue Date
1994
Doctoral Committee Chair(s)
Altstetter, Carl J.
Department of Study
Materials Science and Engineering
Discipline
Materials Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Metallurgy
Engineering, Materials Science
Language
eng
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.
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