ＳＵＳ３１６鋼平滑材のクリープ疲労下における微小き裂の分布と進展挙動に基づく余寿命評価法

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タイトル別名
  • A remaining life prediction method on the basis of micro-crack initiation and growth behavior under creep-fatigue in plain specimen of 316 stainless steel.
  • SUS316 コウ ヘイカツザイ ノ クリープ ヒロウカ ニ オケル ビシ

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抄録

To assure high-temperature component safety and reliability, a life prediction method has been developed. The method is based on the micro-crack growth rate and the microcrack distribution.<br>Strain controlled low-cycle fatigue tests were carried out on the plain specimens of SUS 316 at 923K in air and the initiation and growth behavior of surface micro-cracks were observed.<br>The results obtained are summarized below.<br>(1) The creep-fatigue life is governed by micro-crack growth.<br>(2) A linear relationship is observed between the logarithms of main surface crack length and the life ratio, N/Nf, for various strain loading conditions.<br>(3) The distribution of micro-crack length obeys the Weibull distribution.<br>Moreover, the maximum crack length in an area larger than the sample area can be estimated with a help of the statistics of extremes. Therefore, the remaining life of high-temperature components may be accurately predicted by measuring the distribution of surface micro-crack length in critical parts.

収録刊行物

  • 材料

    材料 35 (389), 170-175, 1986

    公益社団法人 日本材料学会

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