M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: OS0810
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疲労限度を挟んだ二段変動応力振幅下におけるNi基超合金鋳造材の疲労き裂進展挙動
*倉光 貴之高梨 正祐満留 大樹曙 紘之菅田 淳
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This study investigated fatigue crack propagation behavior and the number of cycles to fatigue crack arrest of cast Ni based superalloy 246 below its fatigue limit. Fatigue tests were performed under two-step variable amplitude stresses above and below the fatigue limit under load controlled condition. Low level stresses σLow below the fatigue limit are set as 91.4 MPa and 68.6 MPa. As the result of the observation of the micro cracks and they progresses under σLow = 91.4 MPa. Also in the case of σLow = 68.6 MPa, the micro crack progresses. In comparison between the number of cycles to stop fatigue crack propagation under σLow = 91.4 MPa and 68.6 MPa, the number of cycles under σLow = 68.6 MPa is less than σLow = 91.4 MPa.

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