Change of Ultrasonic Attenuation and Microstructure Evolution during Creep of SUS316L Austenite Stainless Steels

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  • ＳＵＳ３１６Ｌオーステナイト系ステンレス鋼のクリープ損傷にともなう超音波減衰と材料微視組織の変化
  • SUS316Lオーステナイトケイ ステンレス コウ ノ クリープ ソンショウ ニ トモナウ チョウオンパ ゲンスイ ト ザイリョウ ビシ ソシキ ノ ヘンカ

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Abstract

Electromagnetic acoustic resonance (EMAR) is a contactless resonant method with an electromagnetic acoustic transducer (EMAT). This method is free from extra energy losses, resulting in the measurement of intrinsic ultrasonic attenuation in solids. In this study, the EMAR was applied to detect the creep damage of an Austenite Stainless Steel, SUS316L. The material was exposed to the temperature of 973K at various stresses. We measured ultrasonic attenuation for 1-8-MHz frequency range as the creep advanced. The attenuation coefficient exhibits much larger sensitivity to the damage accumulation than the velocity. In a short interval, between 60% and 70% of whole life, attenuation experiences a large peak, being independent of the stress. This novel phenomenon is interpreted as resulting from microstructure changes, especially, dislocation mobility. This is supported by TEM observations for dislocation structure. This technique has a potential to assess the damage advance and to predict the creep life of metals.

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