@article{oai:our.repo.nii.ac.jp:02008290, author = {皮籠石, 紀雄 and カワゴイシ, ノリオ and Kawagoishi, Norio and 大園, 義久 and オオゾノ, ヨシヒサ and Ozono, Yoshihisa and 陳, 強 and ゴトウ, マサヒロ and Chen, Qiang and 後藤, 真宏 and タナカ, ヒデホ and Goto, Masahiro and 田中, 秀穂 and コンドウ, エイジ and Tanaka, Hideho and 近藤, 英二 and Kondo, Eiji}, issue = {620}, journal = {日本機械学會論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A}, month = {Apr}, note = {Rotating bending fatigue tests were carried out for Ni base super alloy Inconel 718 at room temperature and elevated temperatures of 300℃, 500℃ and 600℃ in order to investigate the effect of surface oxidation at the elevated temperatures on the fatigue crack initiation and its early growth process. The fatigue strength was higher at the elevated temperatures than at room temperature when stress levels were low. This phenomenon was caused from that the growth of a crack smaller than the size of a few grains was suppresed at the elevated temperatures, though the growth of a larger crack was accelerated. The main reason for the suppression of the early growth of a small crack was a formation of oxide films on the specimen surface at the elevated temperatures.}, pages = {839--844}, title = {Ni基超合金の疲労き裂発生および初期伝ぱに及ぼす高温酸化膜の影響}, volume = {64}, year = {1998} }