非線形超音波によるボイラ配管溶接部のタイプIV 損傷の検出

概要

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In this study, we evaluated creep damage accumulation in steel welds using the nonlinear acoustic method andmicrostructural observation. The welds used for the experiment had been employed in boiler exchange tubes of a fossilfuel power plant for 20 years. Samples were cut from the welded region so that they had two planes parallel to thelongitudinal direction of the tubes. For the nonlinear acoustic method, we used the immersion technique. Burst waves of18 MHz were transmitted to the samples, and harmonic waves were detected in the reflection to obtain the images ofamplitudes. Increased amplitudes were measured around the heat-affected zone (HAZ), which corresponded to the areasof high creep void density observed by microscopy. The nonlinear acoustic method has been confirmed to have thepotential to assess the creep damage.
湘南工科大学の論文
2009-03-31