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Long-Term Aging Diagnosis of Rotor Steel Using Acoustic Nonlinearity
- Issue Date
- Dec-2011
- Publisher
- 한국비파괴검사학회
- Keywords
- Acoustic Nonlinearity; Long-Term Aging; Harmonic Generation; Precipitate
- Citation
- 비파괴검사학회지, v.31, no.6, pp.642 - 649
- Indexed
- KCI
- Journal Title
- 비파괴검사학회지
- Volume
- 31
- Number
- 6
- Start Page
- 642
- End Page
- 649
- ISSN
- 1225-7842
- Abstract
- The long-term aging of ferritic 2.25CrMo steel was characterized using the acoustic nonlinear effect in order to apply to diagnose the degradation behavior of structural materials. We measured the acoustic nonlinearity parameter for each thermally aged specimen by the higher harmonic-generation technique. The acoustic nonlinearity parameter increased with aging time due to equilibrium M6C carbide precipitation, and has a favorable linear relation with Rockwell hardness. This study suggests that acoustic nonlinearity testing may be applicable to diagnostics on strength degradation in rotor steels.
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Related Researcher
- Jhang, Kyung Young
- COLLEGE OF ENGINEERING (SCHOOL OF MECHANICAL ENGINEERING)