Ni 基耐熱合金のクリープに起因した微細組織と超音波特製の変化

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  • Creep-Induced Microstructural Evolution and Ultrasonic Characterization in a Nickel-Based Super-Alloy
  • Niキ タイネツ ゴウキン ノ クリープ ニ キイン シタ ビサイ ソシキ ト チョウオンパ トクセイ ノ ヘンカ

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We studied microstructure changes of a Nickel-based super-alloy (Waspaloy) subjected to a tensile stress at 1073 K. We monitored the shear-wave attenuation and velocity using electromagnetic acoustic resonance (EMAR) The attenuation peaks 35% and 40% of creep life, being independent of applied stress. A drastic change in dislocation mobility and arrangement interrupted this novel attenuation phenomenon, as supported by SEM and TEM observation. The relationship between attenuation change and microstructural evolution can be explained with the string's model. EMAR demonstrates a potential for assessing damage advance and predicting the remaining creep life of metals.

We studied microstructure changes of a Nickel-based super-alloy (Waspaloy) subjected to a tensile stress at 1073 K. We monitored the shear-wave attenuation and velocity using electromagnetic acoustic resonance (EMAR) The attenuation peaks 35% and 40% of creep life, being independent of applied stress. A drastic change in dislocation mobility and arrangement interrupted this novel attenuation phenomenon, as supported by SEM and TEM observation. The relationship between attenuation change and microstructural evolution can be explained with the string's model. EMAR demonstrates a potential for assessing damage advance and predicting the remaining creep life of metals.

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