Effect of defects on the fatigue limit of Ni-based superalloy 718 with different grain sizes

Kevinsanny; Saburo Okazaki; Osamu Takakuwa; Yuhei Ogawa; Koichi Okita; Yusuke Funakoshi; Junichiro Yamabe; Saburo Matsuoka; Hisao Matsunaga

doi:10.1111/ffe.12989

Effect of defects on the fatigue limit of Ni-based superalloy 718 with different grain sizes

Kevinsanny, Saburo Okazaki, Osamu Takakuwa, Yuhei Ogawa, Koichi Okita, Yusuke Funakoshi, Junichiro Yamabe, Saburo Matsuoka, Hisao Matsunaga

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Tension-compression fatigue tests were performed on two types of Ni-based superalloy 718 with different microstructures in which small artificial defects of various sizes and shapes were introduced. The susceptibility of the fatigue strength to the defects varied significantly with the microstructure morphology, ie, a smaller grain size made the alloy more susceptible to defects. The fatigue limit as a small-crack threshold was successfully predicted using the √area parameter model. The evaluation of the fatigue limit was classified into the following three stages depending on the defect size: (a) harmless defect regime, (b) small-crack regime, and (c) large-crack regime. Such a classification enabled comprehensive evaluation of the fatigue limit in a wide range of defect size, considering (a) defect size over a range of small crack to large crack and (b) characteristics of matrix represented by grain size and hardness.

Original language	English
Pages (from-to)	1203-1213
Number of pages	11
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	42
Issue number	5
DOIs	https://doi.org/10.1111/ffe.12989
Publication status	Published - May 2019

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Effect of defects on the fatigue limit of Ni-based superalloy 718 with different grain sizes",

abstract = "Tension-compression fatigue tests were performed on two types of Ni-based superalloy 718 with different microstructures in which small artificial defects of various sizes and shapes were introduced. The susceptibility of the fatigue strength to the defects varied significantly with the microstructure morphology, ie, a smaller grain size made the alloy more susceptible to defects. The fatigue limit as a small-crack threshold was successfully predicted using the √area parameter model. The evaluation of the fatigue limit was classified into the following three stages depending on the defect size: (a) harmless defect regime, (b) small-crack regime, and (c) large-crack regime. Such a classification enabled comprehensive evaluation of the fatigue limit in a wide range of defect size, considering (a) defect size over a range of small crack to large crack and (b) characteristics of matrix represented by grain size and hardness.",

author = "Kevinsanny and Saburo Okazaki and Osamu Takakuwa and Yuhei Ogawa and Koichi Okita and Yusuke Funakoshi and Junichiro Yamabe and Saburo Matsuoka and Hisao Matsunaga",

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AU - Kevinsanny,

AU - Okazaki, Saburo

AU - Takakuwa, Osamu

AU - Ogawa, Yuhei

AU - Okita, Koichi

AU - Funakoshi, Yusuke

AU - Yamabe, Junichiro

AU - Matsuoka, Saburo

AU - Matsunaga, Hisao

N1 - Funding Information: This study was performed as part of a collaborative research project of the Japan Aerospace Exploration Agency (JAXA) and Kyushu University. Publisher Copyright: © 2019 Wiley Publishing Ltd.

PY - 2019/5

Y1 - 2019/5

N2 - Tension-compression fatigue tests were performed on two types of Ni-based superalloy 718 with different microstructures in which small artificial defects of various sizes and shapes were introduced. The susceptibility of the fatigue strength to the defects varied significantly with the microstructure morphology, ie, a smaller grain size made the alloy more susceptible to defects. The fatigue limit as a small-crack threshold was successfully predicted using the √area parameter model. The evaluation of the fatigue limit was classified into the following three stages depending on the defect size: (a) harmless defect regime, (b) small-crack regime, and (c) large-crack regime. Such a classification enabled comprehensive evaluation of the fatigue limit in a wide range of defect size, considering (a) defect size over a range of small crack to large crack and (b) characteristics of matrix represented by grain size and hardness.

AB - Tension-compression fatigue tests were performed on two types of Ni-based superalloy 718 with different microstructures in which small artificial defects of various sizes and shapes were introduced. The susceptibility of the fatigue strength to the defects varied significantly with the microstructure morphology, ie, a smaller grain size made the alloy more susceptible to defects. The fatigue limit as a small-crack threshold was successfully predicted using the √area parameter model. The evaluation of the fatigue limit was classified into the following three stages depending on the defect size: (a) harmless defect regime, (b) small-crack regime, and (c) large-crack regime. Such a classification enabled comprehensive evaluation of the fatigue limit in a wide range of defect size, considering (a) defect size over a range of small crack to large crack and (b) characteristics of matrix represented by grain size and hardness.

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Effect of defects on the fatigue limit of Ni-based superalloy 718 with different grain sizes

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