Non-Destructive Evaluation of Fatigue Damage in Type 316 Stainless Steel by Using β<SUP>+</SUP>-γ Coincidence Positron Lifetime Spectrometer

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  • Chalermkarnnon Prasert
    Department of Materials Science and Engineering, Osaka University
  • Kawaguchi Yasuhiro
    Institute of Nuclear Technology, Institute of Nuclear Safety System, Inc.
  • Araki Hideki
    Department of Materials Science and Engineering, Osaka University Frontier Research Center, Graduate School of Engineering, Osaka University
  • Shirai Yasuharu
    Department of Materials Science and Engineering, Osaka University Frontier Research Center, Graduate School of Engineering, Osaka University

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  • β<SUP>+</SUP>-γ同時計測陽電子寿命測定法によるSUS316鋼の非破壊的疲労評価
  • β+-γ同時計測陽電子寿命測定法によるSUS316鋼の非破壊的疲労評価
  • ベータ ガンマ ドウジ ケイソク ヨウデンシ ジュミョウ ソクテイホウ ニ ヨル SUS316 コウ ノ ヒハカイテキ ヒロウ ヒョウカ
  • Non-Destructive Evaluation of Fatigue Damage in Type 316 Stainless Steel by Using &beta;<SUP>+</SUP>-&gamma; Coincidence Positron Lifetime Spectrometer

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Newly developed β+-γ coincidence positron lifetime spectroscopy was applied to analysis of fatigue damage aiming at non-destructive evaluation of fatigue stored in type 316 stainless steel which is mostly used in primary water line of pressurized water reactor. Stress-controlled fatigue specimens and strain-controlled fatigue specimens were prepared and relations between fatigue life and positron lifetime were investigated. Mean positron lifetime increases with the fatigue life monotonically in both fatigue test modes. In the strain-controlled mode, mean positron lifetime increases faster at early stage than that in the stress-controlled mode; however, it converges to the same value at the end of the fatigue life in both conditions. Component analysis of positron lifetime spectra revealed that main defects are dislocations and their density increases with fatigue life to a critical value. With this non-destructive evaluation method, the fatigue damage can be analyzed precisely without destruction of the sample.

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