A new eddy current method for nondestructive testing of creep damage in austenitic boiler tubing
Source abstract
Abstract
Abstract A new nondestructive eddy current technique is described for testing for incipient creep damage in austenitic steel boiler tubing in power plants. It is used because as incipient creep damage is formed, a magnetic oxide scale forms on the outside of the boiler tube in concentration proportional to the incipient creep damage; simultaneously in the base metal under the scale, a magnetic ferrite phase also forms in the grains and grain boundaries, which is in smaller concentration, but which is also in concentration proportional to the incipient creep damage. The eddy current signal can be processed in such a way that it varies monotonically and nearly linearly with the magnetic phase concentration and monotonically and nearly linearly with the incipient creep damage. Various aspects of the measurement are analysed and discussed—for example, liftoff, wall thickness, and diameter dependence. Using a zero point value to assess oxide layer permeability and dependence on conductivity is also discussed. Comparison is made between measurements and finite element modelling results. Keywords: austenitic steel boiler tubingincipient creep damageeddy current detectionnondestructive evaluation Acknowledgements We gratefully acknowledge the support of the Electric Power Research Institute Project No. EP-P14000/C6917
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Non-Destructive Testing Techniques · Magnetic Properties and Applications · Ultrasonics and Acoustic Wave Propagation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
a Gdansk University of Technology , Gdansk , PL-80-952 , Poland
b Mag-Lab, sc , Ul. Sztormowa 1A-6, Gdansk , PL-80-335 , Poland
d Applied Magnetic and Physical Modeling, LLC , San Antonio, TX , 78240-2307 , USA
e DesArt , Gdynia , Poland
f Electric Power Research Institute , 1300 West W. T. Harris Boulevard, Charlotte, NC , 28262 , USA
References (16)
Show source-provided references
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