Monitoring microstructural evolution in irradiated steel with second harmonic generation

Journal Article · Tue Mar 31 04:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4914776· OSTI ID:22391221

Kim, Jin-Yeon; Jacobs, Laurence J. ^[1]; Wall, James J. ^[2]; Qu, Jianmin ^[3]

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1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (United States)
2. Electric Power Research Institute, Charlotte, NC 28262 (United States)
3. Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208 (United States)

Material damage in structural components is driven by microstructural evolution that occurs at low length scales and begins early in component life. In metals, these microstructural features are known to cause measurable changes in the acoustic nonlinearity parameter. Physically, the interaction of a monochromatic ultrasonic wave with microstructural features such as dislocations, precipitates, and vacancies, generates a second harmonic wave that is proportional to the acoustic nonlinearity parameter. These nonlinear ultrasonic techniques thus have the capability to evaluate initial material damage, particularly before crack initiation and propagation occur. This paper discusses how the nonlinear ultrasonic technique of second harmonic generation can be used as a nondestructive evaluation tool to monitor microstructural changes in steel, focusing on characterizing neutron radiation embrittlement in nuclear reactor pressure vessel steels. Current experimental evidence and analytical models linking microstructural evolution with changes in the acoustic nonlinearity parameter are summarized.

• OSTI ID: 22391221
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1650; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACK PROPAGATION
DAMAGE
DISLOCATIONS
EMBRITTLEMENT
HARMONIC GENERATION
IRRADIATION
MATERIALS TESTING
MICROSTRUCTURE
MONITORING
MONOCHROMATIC RADIATION
NONDESTRUCTIVE ANALYSIS
NONLINEAR PROBLEMS
PRESSURE VESSELS
REACTORS
STEELS
ULTRASONIC WAVES
VACANCIES