Non-propagating fatigue cracks in austenitic steels with a micro-notch: Effects of dynamic strain aging, martensitic transformation, and microstructural hardness heterogeneity

Yuri Nishikura; Motomichi Koyama; Yusuke Yamamura; Takuro Ogawa; Kaneaki Tsuzaki; Hiroshi Noguchi

doi:10.1016/j.ijfatigue.2018.04.027

Non-propagating fatigue cracks in austenitic steels with a micro-notch: Effects of dynamic strain aging, martensitic transformation, and microstructural hardness heterogeneity

Yuri Nishikura, Motomichi Koyama, Yusuke Yamamura, Takuro Ogawa, Kaneaki Tsuzaki, Hiroshi Noguchi

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

5 Citations (Scopus)

Abstract

The non-propagation limit of a microstructurally small fatigue crack was investigated with respect to dynamic strain aging (DSA), martensitic transformation, and microstructural hardness heterogeneity. In this study, we selected four model alloys: Fe-19Cr-8Ni-0.05C, Fe-19Cr-8Ni-0.14C, Fe-23Mn-0.5C, and as-hot-rolled Fe-30Mn-3Si-3Al steels. Transformation-induced cyclic hardening results in the most significant improvement of the non-propagation limit, i.e., in the case of the Fe-19Cr-8Ni-0.05C steel. Within different contexts, DSA, transformation-induced crack closure, and hardness-heterogeneity-enhanced plasticity-induced crack closure could also realize superior non-propagation limits. The effects of DSA and hardness heterogeneity can be combined with the effects of transformation, which is expected to create a new venue of material design and selection in terms of the crack non-propagation limit.

Original language	English
Pages (from-to)	359-366
Number of pages	8
Journal	International Journal of Fatigue
Volume	113
DOIs	https://doi.org/10.1016/j.ijfatigue.2018.04.027
Publication status	Published - 2018 Aug
Externally published	Yes

Keywords

Austenitic steel
Dynamic strain aging
High cycle fatigue
Martensitic transformation
Non-propagating fatigue crack

ASJC Scopus subject areas

Modelling and Simulation
Materials Science(all)
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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Non-propagating fatigue cracks in austenitic steels with a micro-notch : Effects of dynamic strain aging, martensitic transformation, and microstructural hardness heterogeneity. / Nishikura, Yuri; Koyama, Motomichi; Yamamura, Yusuke; Ogawa, Takuro; Tsuzaki, Kaneaki; Noguchi, Hiroshi.

In: International Journal of Fatigue, Vol. 113, 08.2018, p. 359-366.

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

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abstract = "The non-propagation limit of a microstructurally small fatigue crack was investigated with respect to dynamic strain aging (DSA), martensitic transformation, and microstructural hardness heterogeneity. In this study, we selected four model alloys: Fe-19Cr-8Ni-0.05C, Fe-19Cr-8Ni-0.14C, Fe-23Mn-0.5C, and as-hot-rolled Fe-30Mn-3Si-3Al steels. Transformation-induced cyclic hardening results in the most significant improvement of the non-propagation limit, i.e., in the case of the Fe-19Cr-8Ni-0.05C steel. Within different contexts, DSA, transformation-induced crack closure, and hardness-heterogeneity-enhanced plasticity-induced crack closure could also realize superior non-propagation limits. The effects of DSA and hardness heterogeneity can be combined with the effects of transformation, which is expected to create a new venue of material design and selection in terms of the crack non-propagation limit.",

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