Kyushu University Academic Staff Educational and Research Activities Database
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Kaneaki Tsuzaki Last modified date:2018.03.19

Graduate School
Undergraduate School

Kyushu University, Fatigue and Fracture of Materials Laboratory .
Academic Degree
Doctor of Engineering
Field of Specialization
Material strength
Outline Activities
The research is conducted in the field of adavnced structural materials with keywords: Mechanical Engineering and Materials Science, Material Strength and Microstructures, Crack and Dislocation.
The two majior research topics:
1) Material development and evaluation for Hydrogen Energy Society.
2) Material development and evaluation for Unti-seismic Scoiety.
Research Interests
  • Improvement of fagtigue property of high strength steel under severe circumstances
    keyword : Hydrogen society, earthquake, plastic deformation, crack, steel
  • Developement of Advanced High Strength Steels through Microstructure Control
    keyword : high strength steel, strength, toughness, hydrogen embrittlement, microstrucutre control, thermo-mechanical treatment, grain refinement
Academic Activities
1. T. Sawaguchi, Ilya Nikulin, K. Ogawa, K. Sekido, S. Takamori, T. Maruyama, Y. Chiba, A. Kushibe, Y. Inoue, Kaneaki Tsuzaki, Designing Fe-Mn-Si alloys with improved low-cycle fatigue lives, SCRIPTA MATERIALIA, 10.1016/j.scriptamat.2014.11.024, 99, 49-52, 2015.04.
2. Koyama M., Tasan, Cemal Cem, Akiyama, Eiji, Kaneaki Tsuzaki, Raabe, Dierk, Hydrogen-assisted decohesion and localized plasticity in dual-phase steel, ACTA MATERIALIA, 10.1016/j.actamat.2014.01.048, 70, 174-187, 2014.05.
3. Koyama M., Akiyama E., Tsuzaki K., Raabe D., Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging, ACTA MATERIALIA, 10.1016/j.actamat.2013.04.030, 61, 12, 4607-4618, 2013.07, We investigated the hydrogen embrittlement of a Fe-18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking. A tensile test under ongoing hydrogen charging was performed at low strain rate (1.7 × 10-6 s -1) to observe hydrogen-assisted cracking and crack propagation. Hydrogen-stimulated cracks and deformation twins were observed by electron channeling contrast imaging. We made the surprising observation that hydrogen-assisted cracking was initiated both at grain boundaries and also at deformation twins. Also, crack propagation occurred along both types of interfaces. Deformation twins were shown to assist intergranular cracking and crack propagation. The stress concentration at the tip of the deformation twins is suggested to play an important role in the hydrogen embrittlement of the Fe-Mn-C twining-induced plasticity steel..
4. Meysam Jafari, Yuuji Kimura, Kaneaki Tsuzaki, Toughening by the addition of phosphorus to a high-strength steel with ultrafine elongated grain structure, PHILOSOPHICAL MAGAZINE LETTERS, 10.1080/09500839.2012.750766, 93, 2, 109-115, 2013.02, Phosphorus-doped high-strength steels are typically brittle at room temperature. In contrast to the non-hardening embrittlement of body-centred cubic (bcc) steels which decreases toughness without increasing strength, we observed an increase in toughness of about 20% by adding a large amount (0.053 wt%) of phosphorus (P) to a high-strength bcc steel with an ultrafine elongated ferrite grain structure processed by warm calibre rolling at 500 °C which produced a 91% reduction in area. The enhanced toughness is attributed to P segregation, which causes grain boundaries to become feasible crack propagation paths, thereby enhancing delamination toughening. The 0.053% P steel showed a microstructure and tensile properties similar to those of 0.001% P steel (reference steel). .
Membership in Academic Society
  • Architectural Institute of Japan
  • The Japan Society For Heat Treatment
  • The Japan Society for Technology of Plasticity
  • The Iron and Steel Institute of Japan
  • The Japan Society of Mechanical Engineers
  • The Japan Institute of Metals
  • Research on Matrensite and Hydrogen Embrittlement in Steels