Effect of microstructure on high-cycle fatigue properties of Alloy718 plates

Yuri, Tetsumi; Nagashima, Nobuo; Ogata, Tetsuya; Nagao, Naoki

doi:10.1088/1757-899x/102/1/012001

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…It is well known that a smaller grain size leads to an increase in the fatigue strength of various materials . Ono et al reported an interesting result for the fatigue strength of three types of Alloy 718, namely, FG, CG, and bimodal‐grained samples. In their experiments, the fatigue strength of the FG sample with higher tensile strength was also clearly higher than that of the CG sample.…”

Section: Resultsmentioning

confidence: 99%

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

Kevinsanny

Okazaki

Takakuwa

et al. 2019

Fatigue Fract Eng Mat Struct

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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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Section: Resultsmentioning

confidence: 99%

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

Kevinsanny

Okazaki

Takakuwa

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Such difference in the fatigue strength can be attributed to grain size difference with the former of ~35 µm while the latter of ~90 µm. HCF tests on wrought IN718 with different grain sizes by Ono et al [59] and Kevinsanny et al [60] revealed higher fatigue life corresponded to the higher strength and hardness in the fine-grained samples compared to the coarse-grained samples. It is well known that grain boundaries hinder the slip transfer between grains, leading to the formation of pile-ups and hardening as the grain size decreases [12].…”

Section: Fatigue Data Comparisonmentioning

confidence: 97%