Ni基超合金の高温における疲労き裂伝ぱ抵抗

Translated title of the contribution: Fatigue Crack Growth Resistance in Nickel-Base Superalloy at Elevated Temperatures

皮籠石 紀雄, 陳 強, 西谷 弘信, 後藤 真宏, 田中 秀穂

Research output: Contribution to journalArticlepeer-review

Abstract

Rotating bending fatigue tests were carried out for Inconel 718 at room temperature and elevated temperatures of 300°C, 500°C and 600°C to investigate the influence of temperature on the fatigue crack growth resistance. The crack growth rate can be expressed by the small crack growth law, dl/dN=C<SUB>1</SUB>σ<SUP>n</SUP><SUB>a</SUB>l=C<SUB>2</SUB>(σ<SUB>a</SUB>/σ<SUB>B</SUB>)<SUP>n</SUP>l, at all the temperatures, where σ<SUB>B</SUB>, σ<SUB>a</SUB> and l are the tensile strength, the stress amplitude and the crack length, and C<SUB>1</SUB>, C<SUB>2</SUB> and n are constants. Therefore, the resistance to crack growth was evaluated using the small crack growth law. The fatigue crack growth resistance decreased with the increase of temperature.
Translated title of the contributionFatigue Crack Growth Resistance in Nickel-Base Superalloy at Elevated Temperatures
Original languageJapanese
Pages (from-to)2298-2302
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume63
Issue number615
DOIs
Publication statusPublished - Nov 25 1997

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