Kaneaki Tsuzaki

Kyushu University

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Motomichi Koyama

Tohoku University

164

Eiji Akiyama

Tohoku University

Takahiro Sawaguchi

National Institute for Materials Science

Toru Hara

National Institute for Materials Science

Andrey Belyakov

Belgorod National Research University

Takahito Ohmura

National Institute for Materials Science

Yuuji Kimura

National Institute for Materials Science

Hiroshi Noguchi

University of Tsukuba

Xiaohua Min

Dalian University of Technology

Satoshi Emura

National Institute for Materials Science

Cooperative Institutions

National Institute for Materials Science

124

Kyushu University

114

Kyoto University

Tohoku University

Osaka University

The University of Tokyo

Materials Science & Engineering

Institute of Metals Research

Nippon Steel (Japan)

National Institute of Advanced Industrial Science and Technology

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Bone-like crack resistance in hierarchical metastable nanolaminate steels

Science (2017)

Motomichi Koyama Zhao Zhang Meimei Wang Dirk Ponge Dierk Raabe

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.

Substructure

Toughening

Metastability

10.1126/science.aal2766

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Citations (344)

A Large Plastic Elongation followed by Brittle Fracture : a Case of Tensile Deformation at –180 °C in a DP Steel

The Proceedings of Conference of Kyushu Branch (2018)

Arata SHOJIMA Motomichi Koyama Shusaku Takagi Kaneaki Tsuzaki

Elongation

Brittle fracture

Brittleness

10.1299/jsmekyushu.2018.71.d33

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Indentation-Induced Deformation Behavior in Martensitic Steel Observed through In Situ Nanoindentation in a Transmission Electron Microscopy

Materials science forum (2006)

Takahito Ohmura Andrew M. Minor Kaneaki Tsuzaki J. W. Morris

Deformation behavior in the vicinity of grain boundary in Fe-0.4wt%C tempered martensitic steel were studied through in-situ nanoindentation in a TEM. Two types of boundaries were imaged in the dislocated martensitic structure: a low-angle lath boundary and a high-angle block boundary. In the case of a low-angle grain boundary, the dislocations induced by the indenter piled up against the boundary. As the indenter penetrated further, a critical stress appears to have been reached and a high density of dislocations was suddenly emitted on the far side of the grain boundary into the adjacent grain. In the case of the high-angle grain boundary, the numerous dislocations that were produced by the indentation were simply absorbed into the boundary, with no indication of pile-up or the transmission of strain.

Indentation

Lath

Grain boundary strengthening

10.4028/www.scientific.net/msf.503-504.239

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Citations (7)

Hydrogen-assisted damage in austenite/martensite dual-phase steel

Philosophical Magazine Letters (2016)

Motomichi Koyama Cemal Cem Taşan Tatsuya Nagashima Eiji Akiyama Dierk Raabe

For understanding the underlying hydrogen embrittlement mechanism in transformation-induced plasticity steels, the process of damage evolution in a model austenite/martensite dual-phase microstructure following hydrogenation was investigated through multi-scale electron channelling contrast imaging and in situ optical microscopy. Localized diffusible hydrogen in martensite causes cracking through two mechanisms: (1) interaction between {1 1 0}M localized slip and {1 1 2}M twin and (2) cracking of martensite–martensite grain interfaces. The former resulted in nanovoids along the {1 1 2}M twin. The coalescence of the nanovoids generated plate-like microvoids. The latter caused shear localization on the specific plane where the crack along the martensite/martensite boundary exists, which led to additional martensite/martensite boundary cracking.

Dual-phase steel

10.1080/09500839.2015.1130275

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Citations (26)

Evaluation of the matrix strength of Fe-0.4 wt% C tempered martensite using nanoindentation techniques

Philosophical Magazine A (2002)

Takahito Ohmura Kaneaki Tsuzaki S. Matsuoka

Matrix (chemical analysis)

10.1080/01418610210135070

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Citations (20)

Refinement of grain boundary cementite in medium-carbon tempered martensite by thermomechanical processing

Materials Science and Engineering A (1999)

Satoru Yusa Toru Hara Kaneaki Tsuzaki T. Takahashi

Ledeburite

Thermomechanical processing

10.1016/s0921-5093(99)00328-7

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Citations (13)

Ausformed high-strength low-alloy steel exhibits exceptional resistance to fatigue crack-growth in high-pressure hydrogen environments

International Journal of Fatigue (2025)

Timothée Redarce Keiichiro Iwata Yuhei Ogawa Kaneaki Tsuzaki Akinobu Shibata

Paris' law

High-strength low-alloy steel

10.1016/j.ijfatigue.2025.108814

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Shape, Size and Crystallographic Orientation of the Ferrite Grains Formed at Grain Boundaries of Deformed Austenite in a Low Carbon Steel

Tetsu-to-Hagane (2000)

Shiro Torizuka Osamu Umezawa Kaneaki Tsuzaki Kotobu Nagai

The influence of plastic strain on the shape, size and crystallographic orientation of ferrite (α) grains formed at the grain boundaries of the deformed austenite (γ) was studied in a 0.17C-0.3Si-1.5Mn steel. Specimens with a coarse γ grain size of 300 μm were compressed at 1023K and cooled at 10K/s. When the plastic strain increased to 0.4, the shape of α grains changed from plate like to equiaxed, and the average length of a grains decreased from 12 to 6 μm. However, the average length did not change in the larger plastic strains up to 1.1. On the other hand, the average thickness of α grains was constant regardless of the plastic strain. The crystallographic orientations of the α grains formed at one γ grain boundary were almost the same when the plastic strain was smaller than 0.2 and the α grain shape was plate like. However, the orientations were widely distributed, and most of the α/α boundaries were high angle ones, when the plastic strain was larger than 0.4 and the α grain shape was equiaxed. The shape change and α grain refinement by the deformation resulted from the wide distribution of crystallographic orientations of α grains rather than from the increase in the nucleation rate. The wide distribution of crystallographic orientation of α grains is closely associated with the serrated austenite grain boundaries induced by the deformation.

Equiaxed crystals

Grain boundary strengthening

10.2355/tetsutohagane1955.86.12_807

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Citations (19)

Ductility improvement in high strength Ti-Mo allovs by transition of deformation mode

Xiaohua Min Satoshi Emura Seiichiro Koichi Tsuchiya Kaneaki Tsuzaki

Ductility (Earth science)

Mode (computer interface)

Source

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