Examining the Experience of Revealing Delayed Deformation Corrosion Cracking

The problem of skipping iron-oxide–filled damages in the welding junctions between the collector and Dn1200 branch pipe of the PGV-1000 steam generator in a VVÉR-1000 reactor facility is considered. The mechanism of crack nucleation and development is described. A hypothesis that cracks filled with...

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Bibliographic Details
Published in:Russian journal of nondestructive testing 2017-04, Vol.53 (4), p.295-303
Main Authors: Razygraev, A. N., Razygraev, N. P., Dikov, I. A.
Format: Article
Language:English
Subjects:
Acoustic Methods
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion
Corrosion products
Crack initiation
Cracks
Damage
Deformation mechanisms
Deposits
Fracture mechanics
Hypotheses
Materials Science
Nucleation
Pipe
Reflectance
Stress corrosion cracking
Structural Materials
Transverse waves
Viability
Wave reflection
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Summary:The problem of skipping iron-oxide–filled damages in the welding junctions between the collector and Dn1200 branch pipe of the PGV-1000 steam generator in a VVÉR-1000 reactor facility is considered. The mechanism of crack nucleation and development is described. A hypothesis that cracks filled with corrosion deposits exhibit minimum reflectivity has been proposed and confirmed. Results of theoretical research into transmission and reflection of ultrasonic waves in the presence of a thin layer of corrosion products surrounded by pearlitic steel are provided. The reflectances of longitudinal and transverse waves from corrosion damages have been calculated and proved the viability of the hypothesis.
ISSN:1061-8309
1608-3385
DOI:10.1134/S1061830917040076