Title:
Experimental characterization of stress corrosion cracking sensitization in austenitic stainless steel using nonlinear ultrasonic Rayleigh waves

dc.contributor.advisor Jacobs, Laurence J.
dc.contributor.author Lakocy, Alexander J.
dc.contributor.committeeMember Kim, Jin-Yeon
dc.contributor.committeeMember Kurtis, Kimberly E.
dc.contributor.department Civil and Environmental Engineering
dc.date.accessioned 2016-01-07T17:40:46Z
dc.date.available 2016-01-07T17:40:46Z
dc.date.created 2015-12
dc.date.issued 2015-12-08
dc.date.submitted December 2015
dc.date.updated 2016-01-07T17:40:46Z
dc.description.abstract This 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.description.degree M.S.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/54476
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Sensitization
dc.subject Rayleigh surface waves
dc.subject Weld
dc.subject Stress corrosion cracking
dc.subject 304 stainless steel
dc.subject Nonlinear ultrasound
dc.title Experimental characterization of stress corrosion cracking sensitization in austenitic stainless steel using nonlinear ultrasonic Rayleigh waves
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Jacobs, Laurence J.
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 5af40958-ece2-4a76-b071-5ba4c6d99d80
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Masters
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