Embrittlement of Austenitic Stainless Steels by Solute Hydrogen
Ulmer, Donald George
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https://hdl.handle.net/2142/72626
Description
Title
Embrittlement of Austenitic Stainless Steels by Solute Hydrogen
Author(s)
Ulmer, Donald George
Issue Date
1988
Doctoral Committee Chair(s)
Altstetter, Carl J.
Department of Study
Metallurgy and Mining Engineering
Discipline
Metallurgical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Metallurgy
Abstract
Mechanical properties of austenitic stainless steel were determined as a function of solute hydrogen concentration. Twenty micron thick foils of types 310s and 304 stainless steel were cathodically precharged to saturation and tested in tension at room temperature. X-ray diffraction experiments were performed to measure the lattice strains produced by the interstitial hydrogen and to identify any hydrogen induced phase transformations which might occur.
A hydrogen embrittlement was proposed based on the locking of dislocations by hydrogen atmospheres. Hydrogen causes an increase in the yield and fracture stresses in the austenitic stainless steels. Hydrogen also causes planar slip needed for large dislocation pile-ups by limiting the number of active dislocation sources. The hydrogen atmospheres assist in blocking the Frank-Read sources near the pile-up and thereby prevent relief of the stress by dislocation movement. This would result in a brittle type fracture.
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