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dc.contributor.advisorJacobs, Laurence J.
dc.contributor.authorLakocy, Alexander J.
dc.date.accessioned2016-01-07T17:40:46Z
dc.date.available2016-01-07T17:40:46Z
dc.date.created2015-12
dc.date.issued2015-12-08
dc.date.submittedDecember 2015
dc.identifier.urihttp://hdl.handle.net/1853/54476
dc.description.abstractThis thesis examines the use of nonlinear ultrasound to evaluate sensitization, a precursor to stress corrosion cracking in austenitic stainless steel. Ultrasonic Rayleigh surface waves are generated on a specimen; as these waves pass through sensitized material, second harmonic generation (SHG) increases. In austenitic stainless steel with oven-induced sensitization, this increase is due only to the formation of chromium carbide precipitates, key products of the sensitization process. Weld-induced sensitization specimens demonstrate additional increases in SHG, likely caused by increased residual stress and dislocation density as a result of uneven heating. Experimental data are used to calculate the acoustic nonlinearity parameter, which provides a single value directly related to the quantity of micro- and nano-scale damage present within any given sample. Using this procedure, the effects of weld- and oven-induced sensitization are compared. Results demonstrate the feasibility of using nonlinear Rayleigh waves to detect and monitor stress corrosion susceptibility of welded material.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectSensitization
dc.subjectRayleigh surface waves
dc.subjectWeld
dc.subjectStress corrosion cracking
dc.subject304 stainless steel
dc.subjectNonlinear ultrasound
dc.titleExperimental characterization of stress corrosion cracking sensitization in austenitic stainless steel using nonlinear ultrasonic Rayleigh waves
dc.typeText
dc.description.degreeM.S.
dc.contributor.departmentCivil and Environmental Engineering
thesis.degree.levelMasters
dc.contributor.committeeMemberKim, Jin-Yeon
dc.contributor.committeeMemberKurtis, Kimberly E.
dc.type.genreThesis
dc.date.updated2016-01-07T17:40:46Z


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