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Title: Monitoring microstructural evolution in irradiated steel with second harmonic generation

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.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4]
  1. Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH Zurich), 8092 Zurich (Switzerland)
  2. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (United States)
  3. Electric Power Research Institute, Charlotte, NC 28262 (United States)
  4. Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208 (United States)
Publication Date:
OSTI Identifier:
22391221
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1650; Journal Issue: 1; Conference: 41. Annual Review of Progress in Quantitative Nondestructive Evaluation, Boise, ID (United States), 20-25 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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