Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel

Shunsuke Mizumachi; Motomichi Koyama; Yoshihiro Fukushima; Kaneaki Tsuzaki

doi:10.2355/isijinternational.ISIJINT-2019-230

Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel

Shunsuke Mizumachi, Motomichi Koyama, Yoshihiro Fukushima, Kaneaki Tsuzaki

IMR - Materials Design Division

Kyushu University

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

12 Citations (Scopus)

Abstract

The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.

Original language	English
Pages (from-to)	175-181
Number of pages	7
Journal	ISIJ International
Volume	60
Issue number	1
DOIs	https://doi.org/10.2355/isijinternational.ISIJINT-2019-230
Publication status	Published - 2020

Keywords

Austenitic steel
Compact tension test
Fatigue
High-entropy alloy
Microstructure evolution

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10.2355/isijinternational.ISIJINT-2019-230

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title = "Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel",

abstract = "The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.",

keywords = "Austenitic steel, Compact tension test, Fatigue, High-entropy alloy, Microstructure evolution",

author = "Shunsuke Mizumachi and Motomichi Koyama and Yoshihiro Fukushima and Kaneaki Tsuzaki",

note = "Funding Information: (JP16H06365 and JP17H04956) and the Japan Science and Technology Agency (JST) (grant number: 20100113) under the Industry-Academia Collaborative R&D Program. Funding Information: This work was financially supported by JSPS KAKENHI Publisher Copyright: {\textcopyright} 2020 ISIJ",

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doi = "10.2355/isijinternational.ISIJINT-2019-230",

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AU - Mizumachi, Shunsuke

AU - Koyama, Motomichi

AU - Fukushima, Yoshihiro

AU - Tsuzaki, Kaneaki

N1 - Funding Information: (JP16H06365 and JP17H04956) and the Japan Science and Technology Agency (JST) (grant number: 20100113) under the Industry-Academia Collaborative R&D Program. Funding Information: This work was financially supported by JSPS KAKENHI Publisher Copyright: © 2020 ISIJ

PY - 2020

Y1 - 2020

N2 - The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.

AB - The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.

KW - Austenitic steel

KW - Compact tension test

KW - Fatigue

KW - High-entropy alloy

KW - Microstructure evolution

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Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel

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