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  Microstructural mechanisms of fatigue crack non-propagation in TRIP-maraging steels

Zhang, Z., Koyama, M., Wang, M., Tsuzaki, K., Tasan, C. C., & Noguchi, H. (2018). Microstructural mechanisms of fatigue crack non-propagation in TRIP-maraging steels. International Journal of Fatigue, 113, 126-136. doi:10.1016/j.ijfatigue.2018.04.013.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E628-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E629-E
Genre: Journal Article

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 Creators:
Zhang, Zhao1, Author              
Koyama, Motomichi1, Author              
Wang, Meimei2, 3, Author              
Tsuzaki, Kaneaki1, Author              
Tasan, Cemal Cem4, Author              
Noguchi, Hiroshi1, Author              
Affiliations:
1Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan, ou_persistent22              
2Adaptive Structural Materials (Experiment), Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863382              
3Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, persistent22              
4Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, ou_persistent22              

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Free keywords: Austenite; Fatigue crack propagation; Fatigue of materials; High strength steel; Laminating; Maraging steel; Martensitic transformations; Plasticity, Crack propagation path; Fatigue cracks; Fatigue Limit; Laminated structures; Microstructural mechanisms; Roughness induced crack closure; Transformation induced plasticity; Transformation-Induced, Crack closure
 Abstract: In contrast to conventional martensitic steels, transformation-induced plasticity (TRIP)-maraging steels exhibit exceptional high ductility without sacrificing strength and excellent fatigue property owing to the retained austenite/maraging martensite laminated structure. In this study, TRIP-maraging steel (Fe-9Mn-3Ni-1.4Al-0.01C, wt.) with fine grained austenite was used to investigate the mechanism of high cycle fatigue resistance. Our analyses revealed that soft austenite region acts as a preferential crack propagation path, but the plastic deformation during crack opening involves martensitic transformation, resisting subsequent crack growth via transformation-induced local hardening or crack closure. Moreover, crack growth along the laminates and across the block boundary forms a zigzag crack path, which would act as roughness-induced crack closure. The combined effect of these factors plays an important role in resisting fatigue crack growth at high cycle fatigue. © 2018 Elsevier Ltd

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Language(s): eng - English
 Dates: 2018-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.ijfatigue.2018.04.013
BibTex Citekey: Zhang2018126
 Degree: -

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Title: International Journal of Fatigue
  Other : Int. J. Fatigue
Source Genre: Journal
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Publ. Info: Guildford, England : Elsevier
Pages: - Volume / Issue: 113 Sequence Number: - Start / End Page: 126 - 136 Identifier: ISSN: 0142-1123
CoNE: /journals/resource/954925471357