Bone-like crack resistance in hierarchical metastable nanolaminate steels

Motomichi Koyama, Zhao Zhang, Meimei Wang, Dirk Ponge, Dierk Raabe, Kaneaki Tsuzaki, Hiroshi Noguchi, Cemal Cem Tasan

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

Fatigue failures create enormous risks for all engineered structures, as well as for human lives, motivating large safety factors in design and, thus, inefficient use of resources. Inspired by the excellent fracture toughness of bone, we explored the fatigue resistance in metastability-assisted multiphase steels. We show here that when steel microstructures are hierarchical and laminated, similar to the substructure of bone, superior crack resistance can be realized. Our results reveal that tuning the interface structure, distribution, and phase stability to simultaneously activate multiple micromechanisms that resist crack propagation is key for the observed leap in mechanical response. The exceptional properties enabled by this strategy provide guidance for all fatigue-resistant alloy design efforts.

Original languageEnglish
Pages (from-to)1055-1057
Number of pages3
JournalScience
Volume355
Issue number6329
DOIs
Publication statusPublished - 2017 Mar 10
Externally publishedYes

ASJC Scopus subject areas

  • General

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    Koyama, M., Zhang, Z., Wang, M., Ponge, D., Raabe, D., Tsuzaki, K., Noguchi, H., & Tasan, C. C. (2017). Bone-like crack resistance in hierarchical metastable nanolaminate steels. Science, 355(6329), 1055-1057. https://doi.org/10.1126/science.aal2766