We studied the evolution of microstructure in a martensitic stainless steel during creep by monitoring ultrasonic attenuation. After obtaining a series of creep samples with various strains under a tensile stress of 120 MPa at 873 K, we removed small samples from the samples and measured free vibration resonance frequencies and attenuation coefficients with electromagnetic acoustic resonance (EMAR). We propose a non‐destructive method using EMAR to evaluate creep damage in small specimens sampled from structural metals in‐service.

Topics
Structural vibrations, Ultrasonic phenomena, Acoustic phenomena, Acoustic damping, Alloys, Materials modification, Tensile stress, Radiometry
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© 2009 American Institute of Physics.
2009
American Institute of Physics
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