Ni基超合金の長寿命域における中高温疲労特性

Translated title of the contribution: Fatigue Properties of Ni-Base Superalloy in Long Life Region at Elevated Temperature

皮籠石 紀雄, 陳 強, 大坪 謙一, 燕 怒, 近藤 英二, 王 清遠

Research output: Contribution to journalArticle

Abstract

The fatigue properties of a nickel-base superalloy, Inconel 718, in long-life region up to 10<SUP>8</SUP> cycles were investigated under rotating bending at room temperature and elevated temperature of 300°C, 500°C and 600°C. S-N curves at 500°C and 600°C showed the stepwise shapes, though those in cases of room temperature and 300°C were the conventional one-step ones. All the fractures originated from the specimen surface at room temperature and 300°C, while the internal fractures occurred in long-life region beyond 10<SUP>7</SUP> cycles and the surface fractures at the stress levels over the horizontal line of S-N curves corresponding to the fatigue limit for the surface fracture at 500°C and 600°C. Intergranular crackings were observed at the origin of internal fracture.
Translated title of the contributionFatigue Properties of Ni-Base Superalloy in Long Life Region at Elevated Temperature
Original languageJapanese
Pages (from-to)1192-1197
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume68
Issue number672
DOIs
Publication statusPublished - Aug 25 2002

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