Small fatigue crack growth in a high entropy alloy

Kai Suzuki, Motomichi Koyama, Hiroshi Noguchi

研究成果: Contribution to journalConference article査読

4 被引用数 (Scopus)

抄録

High-entropy alloys (HEAs) contain a large amount of solid solution elements. This implies that the high capability of solid solution strengthening is expected to increase the resistance to fatigue crack growth. Therefore, we investigated the characteristics of microstructurally small fatigue crack growth of an HEA. In particular, we focused on microstructural fatigue crack growth behavior and associated scatter in crack growth rates. In this study, we used an equiatomic Fe-20Cr-20Ni-20Mn-20Co HEA and an Fe-18Cr-14Ni stable austenitic stainless steel. Rotating bending fatigue tests were performed at ambient temperature using smooth round bar specimens. The fatigue limits of the HEA and stainless steel were 250 and 200 MPa, respectively. The higher fatigue limit of the HEA was attributed to the solid solution strengthening. Furthermore, the scatter in crack growth rates of the HEA was more significant than that of the stainless steel owing to the temporal deceleration or non-propagation of the crack. In the stainless steel, as the crack length increased, the scatter in crack growth rates decreased. In contrast, in the HEA, even if the crack length increased, the scatter in crack growth rates remained significant As a factor that is perhaps related to the scatter characteristics, fatigue cracks with a length of approximately 500 μm in the HEA were highly deflected, compared to those of the stainless steel.

本文言語英語
ページ(範囲)1065-1070
ページ数6
ジャーナルProcedia Structural Integrity
13
DOI
出版ステータス出版済み - 2018
イベント22nd European Conference on Fracture, ECF 2018 - Belgrade, セルビア
継続期間: 8 25 20188 26 2018

All Science Journal Classification (ASJC) codes

  • 機械工学
  • 材料力学
  • 土木構造工学
  • 材料科学(全般)

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