日本機械学会論文集 A編
Online ISSN : 1884-8338
Print ISSN : 0387-5008
Ni基超合金の微小き裂伝ぱ特性
皮籠石 紀雄陳 強田中 秀穂前野 一朗清藤 純一
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1997 年 63 巻 611 号 p. 1398-1402

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Rotating bending fatigue tests were carried out for Inconel 718 at room temperature to investigate the growth characteristics of a small crack. It was found that : (1) The crack initiated at the grain boundary and then propagated as a transgranular crack. (2) When the stress level was higher than the fatigue limit, the fatigue life was mainly controlled by the growth life of a crack smaller than 1mm. (3) The fatigue limit was a limiting stress for the crack propagation. (4) At low stress levels (σa0.2<0.5, σa : stress amplitude, σ0.2 : 0.2% proof stress), the crack growth rate was determined by the stress intensity factor range ΔK ; and at high stress levels (σa0.2>0.6), it was determined by the small crack growth law.

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