Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
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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
Shunsuke MizumachiMotomichi KoyamaYoshihiro FukushimaKaneaki Tsuzaki
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2019 Volume 105 Issue 2 Pages 215-221

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Abstract

Fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with a SUS316L. Fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was grain interior for both alloys. A difference was found to be in the crack roughness, namely, the fatigue crack growth path of the HEA was more distinctly deflected compared with that of the SUS316L. This fact indicates that roughness-induced crack closure is a key factor decreasing the crack growth rate of the HEA. Another key is a non-crystallographic transgranular crack growth mechanism. The SUS316L shows crack growth via crack blunting/re-sharpening, while the HEA shows transgranular crack growth associated with dislocation substructure alignment.

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© 2019 The Iron and Steel Institute of Japan
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