マルチ・マイクロプローブ直流電位差法によるSUS316L鋼製円管の高温疲労寿命の非破壊評価

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  • Application of the Multi-microprobe DC Potential Difference Method to the Non-destructive Estimation of Residual Life of SUS316L Hollow Cylinder Subjected to High Temperature Fatigue in Air

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<p>This paper describes the application of the multi-microprobe DC potential difference method the authors has developed to the high-temperature fatigue of hollow cylinders of JIS SUS 316L steel. Hollow cylinders are considered to be exposed to high-temperature air environment on both of their outer and inner surfaces so that the chance of the initiation of multiple-site small cracks may become higher in the hollow cylinders than in the solid cylinders. The experimental results, however, revealed that fewer small cracks were observed in the hollow cylinders. The number of small cracks initiated was much smaller in the hollow cylinders than in the solid ones, but the small cracks grew and coalesced with one another and became a large crack or cracks to lead the fatigue failure of the cylinders. Large cracks, even though much smaller in number, brought about outliers of potential difference induced around the cracks. This caused sudden rise in the relationships between the standard deviation σV of the normalized potential difference V/Vave and the fatigue life fraction N/Nf at N/Nf≒0.95. The detection of this point can make the fatigue life prediction of the hollow cylinders.</p>

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