Ni基超合金の中・高温疲労における切欠感度

概要

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Rotating bending fatigue tests were carried out for nickel-base superalloy Inconel 718 in air at room temperature and the elevated temperatures of 300℃, 500℃ and 600℃ using the 60 degree V-grooved specimen in order to investigate the influence of temperature on the notch sensitivity of the alloy. The notch sensitivity was assessed in terms of the limiting stress for crack initiation σ_<w1> and that for crack growth σ_<w2>, based on the Linear Notch Mechanics (LNM). It was found that the fatigue limits σ_<w1>, σ_<w2> of notched specimen can be evaluated by LMN at each temperature. Although the notch sensitivity of Inconel 718 to the two fatigue limits is relatively low considering its high static strength at all the temperatures, especially to the fatigue limit for crack growth, it becomes more sensitive at the elevated temperatures than at room temperature. The results were discussed with the effect of temperature on the arresting behavior of fatigue crack growth.
一般社団法人日本機械学会の論文
1998-11-25