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2019

Detection of hydrogen effusion before, during, and after martensitic transformation: Example of multiphase transformation-induced plasticity steel

Koyama, M., Yamasaki, D., Ikeda, A., Hojo, T., Akiyama, E., Takai, K. & Tsuzaki, K., Oct 4 2019, In : International Journal of Hydrogen Energy. 44, 47, p. 26028-26035 8 p.

Research output: Contribution to journalArticle

Martensitic transformations
martensitic transformation
plastic properties
Plasticity
steels
Open Access
Electron diffraction
Plastic deformation
plastics
Imaging techniques
Electrons

Effect of Hydrogen on the Substructure of Lenticular Martensite in Fe-31Ni Alloy

Shibata, A., Enoki, M., Saji, N., Tai, H., Koyama, M., Ohtani, H., Tsuji, N. & Tsuzaki, K., Sep 15 2019, In : Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 50, 9, p. 4027-4036 10 p.

Research output: Contribution to journalArticle

martensite
substructures
Martensite
Hydrogen
hydrogen

Evolution of quasi-brittle hydrogen-assisted damages in a dual-phase steel

Kumamoto, T., Koyama, M., Sato, K. & Tsuzaki, K., Jan 1 2019, In : Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 83, 7, p. 221-230 10 p.

Research output: Contribution to journalArticle

Open Access
Steel
Hydrogen
steels
damage
hydrogen

Evolution of quasi-brittle hydrogen-assisted damages in a dual-phase steel

Kumamoto, T., Koyama, M., Sato, K. & Tsuzaki, K., Jan 1 2019, In : Materials Transactions. 60, 11, p. 2368-2377 10 p.

Research output: Contribution to journalArticle

Steel
Hydrogen
steels
damage
hydrogen

Fatigue behavior in an Fe-N binary ferritic steel: Similarity and difference between carbon and nitrogen

Habib, K., Koyama, M., Sakurada, E., Yoshimura, N., Yokoi, T., Ushioda, K., Tsuzaki, K. & Noguchi, H., Jan 1 2019, In : isij international. 59, p. 186-191 6 p.

Research output: Contribution to journalArticle

Steel
Ferritic steel
Nitrogen
Carbon
Fatigue of materials
Martensitic transformations
martensitic transformation
Hydrogen
Iron
iron

Grain refinement effect on hydrogen embrittlement resistance of an equiatomic CoCrFeMnNi high-entropy alloy

Koyama, M., Ichii, K. & Tsuzaki, K., Jun 21 2019, In : International Journal of Hydrogen Energy. 44, 31, p. 17163-17167 5 p.

Research output: Contribution to journalArticle

hydrogen embrittlement
Hydrogen embrittlement
Grain refinement
Entropy
entropy
Open Access
austenitic stainless steels
Austenitic stainless steel
Entropy
cracks
Crack propagation

Lowering Strain Rate Simultaneously Enhances Carbon- and Hydrogen-Induced Mechanical Degradation in an Fe-33Mn-1.1C Steel

Tuğluca, I. B., Koyama, M., Shimomura, Y., Bal, B., Canadinc, D., Akiyama, E. & Tsuzaki, K., Mar 15 2019, In : Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 50, 3, p. 1137-1141 5 p.

Research output: Contribution to journalArticle

Steel
strain rate
Strain rate
Hydrogen
Carbon
1 Citation (Scopus)

Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys: Inverse austenite stability effects

Koyama, M., Tasan, C. C. & Tsuzaki, K., Jun 1 2019, In : Engineering Fracture Mechanics. 214, p. 123-133 11 p.

Research output: Contribution to journalReview article

Iron alloys
Austenite
Hydrogen
Martensitic transformations
Entropy
4 Citations (Scopus)

Resistance to mechanically small fatigue crack growth in ultrafine grained interstitial-free steel fabricated by accumulative roll-bonding

Lin, X., Koyama, M., Gao, S., Tsuji, N., Tsuzaki, K. & Noguchi, H., Jan 1 2019, In : International Journal of Fatigue. 118, p. 117-125 9 p.

Research output: Contribution to journalArticle

Roll bonding
Fatigue Crack Growth
Steel
Fatigue crack propagation
Fatigue
1 Citation (Scopus)

Revisiting the effects of hydrogen on deformation-induced γ-ε martensitic transformation

Koyama, M., Terao, N. & Tsuzaki, K., Aug 15 2019, In : Materials Letters. 249, p. 197-200 4 p.

Research output: Contribution to journalArticle

Martensitic transformations
martensitic transformation
Hydrogen
martensite
Martensite

Strain localization in copper canister FSW welds for spent nuclear fuel disposal

Forsström, A., Bossuyt, S., Yagodzinskyy, Y., Tsuzaki, K. & Hänninen, H., Sep 2019, In : Journal of Nuclear Materials. 523, p. 347-359 13 p.

Research output: Contribution to journalArticle

Open Access
cans
friction stir welding
spent fuels
Friction stir welding
nuclear fuels
Steel
Vacancies
Strain rate
Hydrogen
Martensite

Transformation-assisted hydrogen desorption during deformation in steels: Examples of α′- and ε-Martensite

Hojo, T., Koyama, M., Terao, N., Tsuzaki, K. & Akiyama, E., Nov 15 2019, In : International Journal of Hydrogen Energy. 44, 57, p. 30472-30477 6 p.

Research output: Contribution to journalArticle

martensite
Martensite
Desorption
Martensitic transformations
martensitic transformation
2018
2 Citations (Scopus)

A new design concept for prevention of hydrogen-induced mechanical degradation: Viewpoints of metastability and high entropy

Koyama, M., Eguchi, T., Ichii, K., Tasan, C. C. & Tsuzaki, K., Jan 1 2018, In : Procedia Structural Integrity. 13, p. 292-297 6 p.

Research output: Contribution to journalConference article

Open Access
Martensite
Hydrogen
Entropy
Degradation
Austenitic steel
2 Citations (Scopus)

An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels

Koyama, M., Hirata, K., Abe, Y., Mitsuda, A., Iikubo, S. & Tsuzaki, K., Dec 1 2018, In : Scientific reports. 8, 1, 16136.

Research output: Contribution to journalArticle

Steel
Hydrogen
Hot Temperature
Thermodynamics
Iron
18 Citations (Scopus)

Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

Ichii, K., Koyama, M., Tasan, C. C. & Tsuzaki, K., Jun 1 2018, In : Scripta Materialia. 150, p. 74-77 4 p.

Research output: Contribution to journalArticle

hydrogen embrittlement
Hydrogen embrittlement
Entropy
entropy
Hydrogen

Effect of Si on temperature dependence of non-propagation limit of small fatigue crack in a Fe-C alloy

Kishida, K., Koyama, M., Yoshimura, N., Sakurada, E., Yokoi, T., Ushioda, K., Tsuzaki, K. & Noguchi, H., Jan 1 2018, In : Procedia Structural Integrity. 13, p. 1032-1036 5 p.

Research output: Contribution to journalConference article

Open Access
Fatigue of materials
Binary alloys
Carbides
Carbon
Temperature

Fatigue behavior of Fe-Cr-Ni-based metastable austenitic steels with an identical tensile strength and different solute carbon contents

Ogawa, T., Koyama, M., Nishikura, Y., Tsuzaki, K. & Noguchi, H., Oct 2018, In : isij international. 58, 10, p. 1910-1919 10 p.

Research output: Contribution to journalArticle

Austenitic steel
Steel
Tensile strength
Carbon
Fatigue of materials
2 Citations (Scopus)
Austenitic steel
tensile strength
Steel
solutes
Tensile strength
1 Citation (Scopus)

Fatigue Crack Growth Behavior and Associated Microstructure in a Metastable High-Entropy Alloy

Eguchi, T., Koyama, M., Fukushima, Y., Tasan, C. C. & Tsuzaki, K., Jan 1 2018, In : Procedia Structural Integrity. 13, p. 831-836 6 p.

Research output: Contribution to journalConference article

Open Access
Fatigue crack propagation
Entropy
Microstructure
Martensite
Ductility
8 Citations (Scopus)

First-Principles Study on Hydrogen Diffusivity in BCC, FCC, and HCP Iron

Hirata, K., Iikubo, S., Koyama, M., Tsuzaki, K. & Ohtani, H., Oct 1 2018, In : Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 49, 10, p. 5015-5022 8 p.

Research output: Contribution to journalArticle

diffusivity
Hydrogen
Iron
diffusion coefficient
iron
5 Citations (Scopus)

High-concentration carbon assists plasticity-driven hydrogen embrittlement in a Fe-high Mn steel with a relatively high stacking fault energy

Tuğluca, I. B., Koyama, M., Bal, B., Canadinc, D., Akiyama, E. & Tsuzaki, K., Feb 21 2018, In : Materials Science and Engineering A. 717, p. 78-84 7 p.

Research output: Contribution to journalArticle

hydrogen embrittlement
stacking fault energy
Hydrogen embrittlement
Steel
Stacking faults
4 Citations (Scopus)

Hydrogen trapping in carbon supersaturated α‑iron and its decohesion effect in martensitic steel

Geng, W. T., Wang, V., Li, J. X., Ishikawa, N., Kimizuka, H., Tsuzaki, K. & Ogata, S., May 1 2018, In : Scripta Materialia. 149, p. 79-83 5 p.

Research output: Contribution to journalArticle

Martensitic steel
martensite
Martensite
Hydrogen
Carbon
1 Citation (Scopus)

Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen

Ichii, K., Koyama, M., Tasan, C. C. & Tsuzaki, K., Jan 1 2018, In : Procedia Structural Integrity. 13, p. 716-721 6 p.

Research output: Contribution to journalConference article

Open Access
Plasticity
Hydrogen
Entropy
Austenite
Ductility
5 Citations (Scopus)
Lithography
Stress concentration
Focused ion beams
Shear strain
Dislocations (crystals)

Microstructural damage evolution and arrest in binary Fe–high-Mn alloys with different deformation temperatures

Koyama, M., Kaneko, T., Sawaguchi, T. & Tsuzaki, K., Oct 1 2018, In : International Journal of Fracture. 213, 2, p. 193-206 14 p.

Research output: Contribution to journalArticle

Damage
Binary
Microstructure
Binary alloys
Martensitic transformations
4 Citations (Scopus)

Microstructural hardness heterogeneity triggers fatigue crack non-propagation in as-hot-rolled Fe-30Mn-3Si-3Al twinning-induced plasticity steel

Koyama, M., Yamamura, Y., Sawaguchi, T., Tsuzaki, K. & Noguchi, H., Mar 1 2018, In : International Journal of Fatigue. 108, p. 18-24 7 p.

Research output: Contribution to journalArticle

Twinning
Fatigue Crack
Steel
Trigger
Plasticity
3 Citations (Scopus)

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

Zhang, Z., Koyama, M., Wang, M. M., Tsuzaki, K., Tasan, C. C. & Noguchi, H., Aug 1 2018, In : International Journal of Fatigue. 113, p. 126-136 11 p.

Research output: Contribution to journalArticle

Maraging steel
Fatigue Crack
Plasticity
Austenite
High Cycle Fatigue
1 Citation (Scopus)
Martensitic Transformation
Fatigue Crack
Austenitic steel
Notch
Martensitic transformations
work hardening
Steel
Twinning
twinning
Strain hardening
6 Citations (Scopus)

Optical microscopy-Based damage quantification: an example of cryogenic deformation of a dual-Phase steel

Uehata, N., Koyama, M., Takagi, S. & Tsuzaki, K., Jan 1 2018, In : ISIJ International. 58, 1, p. 179-185 7 p.

Research output: Contribution to journalArticle

Steel
Cryogenics
Optical microscopy
Ferrite
Martensite
4 Citations (Scopus)

Overview of dynamic strain aging and associated phenomena in Fe-Mn-C austenitic steels

Koyama, M., Sawaguchi, T. & Tsuzaki, K., Aug 15 2018, In : isij international. 58, 8, p. 1383-1395 13 p.

Research output: Contribution to journalReview article

Austenitic steel
Carbon steel
Elongation
Aging of materials
Steel

Overview of dynamic strain aging and associated phenomena in Fe-Mn-C austenitic steels

Koyama, M., Sawaguchi, T. & Tsuzaki, K., Apr 1 2018, In : Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 104, 4, p. 187-200 14 p.

Research output: Contribution to journalReview article

precipitation hardening
Austenitic steel
Carbon steel
Elongation
Aging of materials
3 Citations (Scopus)

Randomization of ferrite/austenite orientation relationship and resultant hardness increment by nitrogen addition in vanadium-microalloyed low carbon steels strengthened by interphase precipitation

Zhang, Y., Shinbo, K., Ohmura, T., Suzuki, T., Tsuzaki, K., Miyamoto, G. & Furuhara, T., Jan 1 2018, In : isij international. 58, 3, p. 542-550 9 p.

Research output: Contribution to journalReview article

Vanadium
Low carbon steel
Austenite
Ferrite
Nitrogen
1 Citation (Scopus)

Split and shift of -martensite peak in an X-ray diffraction profile during hydrogen desorption: A geometric effect of atomic sequence

Koyama, M., Abe, Y. & Tsuzaki, K., Sep 15 2018, In : isij international. 58, 9, p. 1745-1747 3 p.

Research output: Contribution to journalArticle

Martensite
Hydrogen
Desorption
X ray diffraction
Austenitic steel
1 Citation (Scopus)

Strain Rate Sensitivity of Microstructural Damage Evolution in a Dual-Phase Steel Pre-Charged with Hydrogen

Kumamoto, T., Koyama, M. & Tsuzaki, K., Jan 1 2018, In : Procedia Structural Integrity. 13, p. 710-715 6 p.

Research output: Contribution to journalConference article

Open Access
Steel
Strain rate
Hydrogen
Martensite
Fractography
3 Citations (Scopus)

Surface orientation dependence of hydrogen flux in lenticular martensite of an Fe-Ni-C alloy clarified through in situ silver decoration technique

Koyama, M., Yamasaki, D. & Tsuzaki, K., Oct 1 2018, In : Materials Letters. 228, p. 273-276 4 p.

Research output: Contribution to journalArticle

martensite
Silver
Martensite
Hydrogen
silver
2017

Application of Radio Frequency Glow Discharge Sputtering for Nanoindentation Sample Preparation

Sekido, N., Ohmura, T. & Tsuzaki, K., Mar 1 2017, In : Journal of Materials Engineering and Performance. 26, 3, p. 1245-1250 6 p.

Research output: Contribution to journalArticle

Glow discharges
Nanoindentation
Sputtering
Surface roughness
Nanohardness
110 Citations (Scopus)

Bone-like crack resistance in hierarchical metastable nanolaminate steels

Koyama, M., Zhang, Z., Wang, M., Ponge, D., Raabe, D., Tsuzaki, K., Noguchi, H. & Tasan, C. C., Mar 10 2017, In : Science. 355, 6329, p. 1055-1057 3 p.

Research output: Contribution to journalArticle

Bone
Fatigue of materials
Cracks
Steel
Phase stability
16 Citations (Scopus)
Fatigue Crack Propagation
Twinning
Fatigue Crack
Steel
Fatigue crack propagation
4 Citations (Scopus)

Effects of lamella size and connectivity on fatigue crack resistance of TRIP-maraging steel

Zhang, Z., Koyama, M., Wang, M. M., Tsuzaki, K., Tasan, C. C. & Noguchi, H., Jul 1 2017, In : International Journal of Fatigue. 100, p. 176-186 11 p.

Research output: Contribution to journalArticle

Maraging steel
Fatigue Crack
Plasticity
Roughness
Austenite
14 Citations (Scopus)

Effects of martensitic transformability and dynamic strain age hardenability on plasticity in metastable austenitic steels containing carbon

Ogawa, T., Koyama, M., Tasan, C. C., Tsuzaki, K. & Noguchi, H., Jul 1 2017, In : Journal of Materials Science. 52, 13, p. 7868-7882 15 p.

Research output: Contribution to journalArticle

Austenitic steel
Plasticity
Carbon
Steel
Strain hardening
11 Citations (Scopus)
Damage Accumulation
Martensitic Transformation
Low Cycle Fatigue
Fatigue Crack Growth
Martensitic transformations

Fatigue Crack Threshold of Bearing Steel at a Very Low Stress Ratio

Wada, K., Abass, A., Okazaki, S., Fukushima, Y., Matsunaga, H. & Tsuzaki, K., Jan 1 2017, In : Procedia Structural Integrity. 7, p. 391-398 8 p.

Research output: Contribution to journalArticle

Open Access
Bearings (structural)
Steel
Crack closure
Fatigue of materials
Cracks
7 Citations (Scopus)
Fatigue Crack Growth
Evaluation Method
Fatigue crack propagation
Crack
Notch
13 Citations (Scopus)

Hydrogen desorption and cracking associated with martensitic transformation in Fe-Cr-Ni-Based austenitic steels with different carbon contents

Koyama, M., Ogawa, T., Yan, D., Matsumoto, Y., Tasan, C. C., Takai, K. & Tsuzaki, K., Oct 19 2017, In : International Journal of Hydrogen Energy. 42, 42, p. 26423-26435 13 p.

Research output: Contribution to journalArticle

Austenitic steel
Martensitic transformations
martensitic transformation
Desorption
desorption

Hydrogen embrittlement of binary high Mn austenitic steels

Koyama, M., Sawaguchi, T. & Tsuzaki, K., Jan 1 2017, ICF 2017 - 14th International Conference on Fracture. Gdoutos, E. E. (ed.). International Conference on Fracture, p. 75-76 2 p. (ICF 2017 - 14th International Conference on Fracture; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hydrogen embrittlement
Austenitic steel
Martensite
Binary alloys
Austenite