Ni基超合金の微小き裂伝ぱ特性

Translated title of the contribution: Characteristics of Small Crack Growth in a Nickel-Base Superalloy

皮籠石 紀雄, 陳 強, 田中 秀穂, 前野 一朗, 清藤 純一

Research output: Contribution to journalArticle

Abstract

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.
Translated title of the contributionCharacteristics of Small Crack Growth in a Nickel-Base Superalloy
Original languageJapanese
Pages (from-to)1398-1402
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume63
Issue number611
DOIs
Publication statusPublished - Jul 25 1997

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