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Diagnosis of Thermal Aging of Cast Duplex Stainless Steel by Electromagnetic Ultrasonic Method

An electromagnetic acoustic transducer for generating the horizontally polarized ultrasonic shear waves (SH) was developed to measure the change of acoustic velocity caused by thermal aging of cast duplex stainless steel. Acoustic velocity increases with the hardening of the materials. In order to determine the changes of the acoustic velocity due to hardening of the material, the difference Dt of the time of flight of each SH wave was measured at the same position between an unaged and an aged test piece by echo overlap method. The difference Dt of the time of flight of SH waves was related to the difference of propagation factor k (the change in the mechanical property of cast duplex stainless steel). Dt/T was found to depend on the aging effect of cast duplex stainless steel.

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