Ni基超合金インコネル718の超音波疲労特性に及ぼす結晶粒径の影響

Translated title of the contribution: Effect of Grain Size on Ultrasonic Fatigue Properties of Ni-Base Super Alloy Inconel 718

皮籠石 紀雄, 前村 英史, 陳 強, 後藤 真宏, 森野 数博

Research output: Contribution to journalArticle

Abstract

Ultrasonic fatigue tests of plain specimens with different grain sizes were carried out for Ni-base super alloy, Inconel 718, in ambient air in order to investigate the effect of grain size on fatigue properties. Fatigue strength was increased with decrease in grain size. The increase in fatigue strength by refining grain size was mainly caused by the suppression of crack initiation. That is, the effect of grain size on crack growth rate was hardly recognized, though crack morphology was rougher in the specimen of larger grain, meaning that the crack growth in the large-grained specimens was suppressed by roughness induced crack closure. On the other hand, however, more flat facets caused by twin boundary cracking were observed in the large-grained specimens, which inversely led to crack growth acceleration.
Original languageJapanese
Pages (from-to)1000-1005
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume74
Issue number743
DOIs
Publication statusPublished - Jul 25 2008

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Crack propagation
Ultrasonics
Fatigue of materials
Crack closure
Crack initiation
Refining
Surface roughness
Cracks
Air
Fatigue strength

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Ni基超合金インコネル718の超音波疲労特性に及ぼす結晶粒径の影響. / 皮籠石紀雄; 前村英史; 陳強; 後藤真宏; 森野数博.

In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 74, No. 743, 25.07.2008, p. 1000-1005.

Research output: Contribution to journalArticle

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abstract = "Ultrasonic fatigue tests of plain specimens with different grain sizes were carried out for Ni-base super alloy, Inconel 718, in ambient air in order to investigate the effect of grain size on fatigue properties. Fatigue strength was increased with decrease in grain size. The increase in fatigue strength by refining grain size was mainly caused by the suppression of crack initiation. That is, the effect of grain size on crack growth rate was hardly recognized, though crack morphology was rougher in the specimen of larger grain, meaning that the crack growth in the large-grained specimens was suppressed by roughness induced crack closure. On the other hand, however, more flat facets caused by twin boundary cracking were observed in the large-grained specimens, which inversely led to crack growth acceleration.",
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