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 (σ<SUB>a</SUB>/σ<SUB>0.2</SUB><0.5, σ<SUB>a</SUB> : stress amplitude, σ<SUB>0.2</SUB> : 0.2% proof stress), the crack growth rate was determined by the stress intensity factor range ΔK ; and at high stress levels (σ<SUB>a</SUB>/σ<SUB>0.2</SUB>>0.6), it was determined by the small crack growth law.
|寄稿の翻訳されたタイトル||Characteristics of Small Crack Growth in a Nickel-Base Superalloy|
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|出版物ステータス||出版済み - 7 25 1997|
皮籠石紀雄, 陳強, 田中秀穂, 前野一朗, & 清藤純一 (1997). Ni基超合金の微小き裂伝ぱ特性. Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 63(611), 1398-1402. https://doi.org/10.1299/kikaia.63.1398