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Title: Nonlinear ultrasonic assessment of stress corrosion cracking damage in sensitized 304 stainless steel

This research uses nonlinear Rayleigh surface waves to characterize stress corrosion cracking (SCC) damage in welded 304 Stainless Steel (304 SS). 304 SS is widely used in reactor pressure vessels, where a corrosive environment in combination with applied stress due to high internal pressures can cause SCC. Welds and the nearby heat affected zones (HAZ) in the vessel material are especially sensitive to SCC damage. SCC damage results in microstructural changes such as dislocation formation and microcrack initiation that in the long term lead to reduced structural integrity and material failure. Therefore, the early detection of SCC is crucial to ensure safe operation. It has been shown that the microstructural changes caused by SCC can generate higher harmonic waves when excited harmonically. This research considers different levels of SCC damage induced in samples of welded 304 SS by applying stress to a specimen held in a corrosive medium (Sodium Thiosulfate). A nonlinear Rayleigh surface wave is introduced in the material and the fundamental and the second harmonic waves are measured using wedge detection. The nonlinearity parameter that relates the fundamental and the second harmonic amplitudes, is computed to quantify the SCC damage in each sample. These results are used tomore » demonstrate the feasibility of using nonlinear Rayleigh waves to characterize SCC damage.« less
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA (United States)
  2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA (United States)
  3. The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA and Electric Power Research Institute, Charlotte, NC (United States)
Publication Date:
OSTI Identifier:
22391226
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:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRACKING; DAMAGE; DISLOCATIONS; FAILURES; HEAT AFFECTED ZONE; MATERIALS TESTING; MICROSTRUCTURE; NONLINEAR PROBLEMS; PRESSURE VESSELS; RAYLEIGH WAVES; STAINLESS STEEL-304; STRESS CORROSION; STRESSES; ULTRASONIC TESTING; WAVE PROPAGATION; WELDED JOINTS