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1988 1988 Altstetter, Carl J. Ulmer, Donald George 2014-12-17T23:58:29Z 2014-12-17T23:58:29Z 10000-01-01 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. Made available in DSpace on 2014-12-17T23:58:29Z (GMT). No. of bitstreams: 1 8908877.pdf: 4166684 bytes, checksum: 04059f0c0509f7c75ce551473dc63b64 (MD5) Previous issue date: 1988 Embargo set by: Seth Robbins for item 72794 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 95 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988. http://hdl.handle.net/2142/72626 (UMI)AAI8908877 Engineering, Metallurgy Embrittlement of Austenitic Stainless Steels by Solute Hydrogen text Metallurgy and Mining Engineering Metallurgical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.