Effect of Rising Mean Strain on Elevated-Temperature, Low-Cycle Fatigue Life of a SUS 316 Steel

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  • SUS 316鋼の高温低サイクル疲れ寿命におよぼす漸増平均ひずみの影響
  • SUS316 コウ ノ コウオン テイ サイクル ツカレ ジュミョウ ニ オヨ

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Abstract

Fatigue tests were carried out on a Type 316 stainless steel at 600 and 700°C in order to clarify the effect of creep deformation increasing gradually during fatigue tests on elevated-temperature, low-cycle fatigue life. Strain wave forms with or without rising mean strain were used for truncated wave form with a 10-min hold in tension only and triangular wave form. The strain rate of ramps were 40%/min.<BR>For a given total strain range, fatigue life of the truncated wave form is smaller than that of the triangular wave form. The difference between them obtained at 600°C is larger than obtained at 700°C. Well-defined intergranular facets covered with small dimples were observed for specimens tested under truncated wave form at 600°C, but not at 700°C. These results could be explained by phenomenom of recovery process at 700°C, because of which stress applied grain boundaries might have decreased under truncated wave form.<BR>Rising mean strain per cycle under truncated wave form was creep strain, however no clear effect of the rising mean strain on low-cycle fatigue life was observed. Summation of the creep strain corresponding to relaxation stress and rising mean strain per cycle were almost constant for a given total strain range. It is considered that this is a reason why no effect of rising mean strain on fatigue life was observed.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 65 (7), 923-931, 1979

    The Iron and Steel Institute of Japan

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