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2016
1 Citation (Scopus)

Effect of additional boron amount on surface roughness after lathe turning in h-BN dispersed type 304 stainless steels

Kawajiri, M., Emura, S., Min, X., Yamamoto, S., Sakuraya, K. & Tsuzaki, K., Jan 1 2016, In : isij international. 56, 6, p. 1031-1037 7 p.

Research output: Contribution to journalArticle

Boron
Boron nitride
Stainless Steel
Steel
Stainless steel
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
2018

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
2019
Martensitic transformations
martensitic transformation
Hydrogen
Iron
iron
2017

Study on crack occurrence of titanium alloy in tensile test by advanced moiré technique

Wang, Q. H., Ri, S., Tanaka, Y., Naito, K., Koyama, M., Tsuzaki, K. & Ohkubo, M., Jan 1 2017, p. 481-482. 2 p.

Research output: Contribution to conferencePaper

Titanium alloys
Cracks
Shear strain
Crack initiation
Grain boundaries
2016
13 Citations (Scopus)
Fatigue crack propagation
martensite
Martensite
Hydrogen
cracks
20 Citations (Scopus)
hydrogen embrittlement
Hydrogen embrittlement
Binary alloys
binary alloys
martensite
18 Citations (Scopus)

Deformation microstructural evolution and strain hardening of differently oriented grains in twinning-induced plasticity β titanium alloy

Min, X., Emura, S., Chen, X., Zhou, X., Tsuzaki, K. & Tsuchiya, K., Apr 6 2016, In : Materials Science and Engineering A. 659, p. 1-11 11 p.

Research output: Contribution to journalArticle

strain hardening
Microstructural evolution
Twinning
titanium alloys
twinning
2019

EBSD- And ECCI-based Assessments of Inhomogeneous Plastic Strain Evolution Coupled with Digital Image Correlation

Kakimoto, R., Koyama, M. & Tsuzaki, K., Jan 1 2019, In : isij international. 59, 12, p. 2334-2342 9 p.

Research output: Contribution to journalArticle

Open Access
Electron diffraction
Plastic deformation
Imaging techniques
Electrons
Nickel
2017
17 Citations (Scopus)
Fatigue Crack Propagation
Twinning
Fatigue Crack
Steel
Fatigue crack propagation
2018
2 Citations (Scopus)
Martensitic Transformation
Fatigue Crack
Austenitic steel
Notch
Martensitic transformations
2017
8 Citations (Scopus)
Fatigue Crack Growth
Evaluation Method
Fatigue crack propagation
Crack
Notch
2018
2 Citations (Scopus)
Austenitic steel
tensile strength
Steel
solutes
Tensile strength
2016
42 Citations (Scopus)

Design concept and applications of Fe-Mn-Si-based alloys-from shape-memory to seismic response control

Sawaguchi, T., Maruyama, T., Otsuka, H., Kushibe, A., Inoue, Y. & Tsuzaki, K., Jan 1 2016, In : Materials Transactions. 57, 3, p. 283-293 11 p.

Research output: Contribution to journalReview article

Martensitic transformations
martensitic transformation
Seismic response
Shape memory effect
mechanical properties
2018
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
5 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
2019

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
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
2016
13 Citations (Scopus)

Advanced Thermomechanical Processing for a High-Mn Austenitic Steel

Kusakin, P., Tsuzaki, K., Molodov, D. A., Kaibyshev, R. & Belyakov, A., Dec 1 2016, In : Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 47, 12, p. 5704-5708 5 p.

Research output: Contribution to journalArticle

Austenitic steel
Steel
Grain refinement
Strengthening (metal)
Forging
2017
114 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
2019
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
Open Access
Electron diffraction
Plastic deformation
plastics
Imaging techniques
Electrons
2017

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
2018

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
2017

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
2019
Steel
Vacancies
Strain rate
Hydrogen
Martensite

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
2016
4 Citations (Scopus)
Steel
Martensitic transformations
martensitic transformation
Martensite
steels
25 Citations (Scopus)

Effect of γ to ε martensitic transformation on low-cycle fatigue behaviour and fatigue microstructure of Fe-15Mn-10Cr-8Ni-xSi austenitic alloys

Nikulin, I., Sawaguchi, T., Ogawa, K. & Tsuzaki, K., Feb 15 2016, In : Acta Materialia. 105, p. 207-218 12 p.

Research output: Contribution to journalArticle

Martensitic transformations
Fatigue of materials
Microstructure
Hardening
Martensite
2017
7 Citations (Scopus)

Interfacial hydrogen localization in austenite/martensite dual-phase steel visualized through optimized silver decoration and scanning Kelvin probe force microscopy

Nagashima, T., Koyama, M., Bashir, A., Rohwerder, M., Tasan, C. C., Akiyama, E., Raabe, D. & Tsuzaki, K., Mar 1 2017, In : Materials and Corrosion. 68, 3, p. 306-310 5 p.

Research output: Contribution to journalArticle

Steel
Silver
Martensite
Austenite
microscopy
2016
9 Citations (Scopus)

On strengthening of austenitic stainless steel by large strain cold working

Shakhova, I., Belyakov, A., Yanushkevich, Z., Tsuzaki, K. & Kaibyshev, R., Jan 1 2016, In : isij international. 56, 7, p. 1289-1296 8 p.

Research output: Contribution to journalArticle

Cold working
Cold rolling
Austenitic stainless steel
Martensite
Austenite
11 Citations (Scopus)

Delamination toughening assisted by phosphorus in medium-carbon low-alloy steels with ultrafine elongated grain structures

Min, X., Kimura, Y., Kimura, T. & Tsuzaki, K., Jan 1 2016, In : Materials Science and Engineering A. 649, p. 135-145 11 p.

Research output: Contribution to journalArticle

high strength steels
Toughening
Crystal microstructure
carbon steels
High strength steel
2018
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
2019
1 Citation (Scopus)

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)

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
2017
7 Citations (Scopus)

Multiscale in situ deformation experiments: A sequential process from strain localization to failure in a laminated Ti-6Al-4V alloy

Koyama, M., Yamanouchi, K., Wang, Q., Ri, S., Tanaka, Y., Hamano, Y., Yamasaki, S., Mitsuhara, M., Ohkubo, M., Noguchi, H. & Tsuzaki, K., Jun 1 2017, In : Materials Characterization. 128, p. 217-225 9 p.

Research output: Contribution to journalArticle

Experiments
Sampling
Scanning electron microscopy
ambient temperature
interfacial tension
2018
6 Citations (Scopus)
Lithography
Stress concentration
Focused ion beams
Shear strain
Dislocations (crystals)
2017
12 Citations (Scopus)

Two-dimensional Moiré phase analysis for accurate strain distribution measurement and application in crack prediction

Wang, Q., Ri, S., Tsuda, H., Koyama, M. & Tsuzaki, K., Jun 12 2017, In : Optics Express. 25, 12, p. 13465-13480 16 p.

Research output: Contribution to journalArticle

strain distribution
cracks
strain measurement
shear strain
predictions
2018
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
6 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
2019
1 Citation (Scopus)
Open Access
austenitic stainless steels
Austenitic stainless steel
Entropy
cracks
Crack propagation
2020

Plastic deformation sequence and strain gradient characteristics of hydrogen-induced delayed crack propagation in single-crystalline Fe–Si alloy

Huynh, T. T., Koyama, M., Takahashi, Y., Hamada, S., Tsuzaki, K. & Noguchi, H., Mar 15 2020, In : Scripta Materialia. 178, p. 99-103 5 p.

Research output: Contribution to journalArticle

crack propagation
plastic deformation
Hydrogen
Crack propagation
Plastic deformation
2018
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
4 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 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
2017
5 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)

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
85 Citations (Scopus)

Overview of hydrogen embrittlement in high-Mn steels

Koyama, M., Akiyama, E., Lee, Y. K., Raabe, D. & Tsuzaki, K., Apr 27 2017, In : International Journal of Hydrogen Energy. 42, 17, p. 12706-12723 18 p.

Research output: Contribution to journalReview article

hydrogen embrittlement
Hydrogen embrittlement
steels
Hydrogen
Steel
35 Citations (Scopus)

Recent progress in microstructural hydrogen mapping in steels: quantification, kinetic analysis, and multi-scale characterisation

Koyama, M., Rohwerder, M., Tasan, C. C., Bashir, A., Akiyama, E., Takai, K., Raabe, D. & Tsuzaki, K., Sep 2 2017, In : Materials Science and Technology (United Kingdom). 33, 13, p. 1481-1496 16 p.

Research output: Contribution to journalArticle

Steel
Hydrogen
steels
Kinetics
kinetics
2020

Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel

Mizumachi, S., Koyama, M., Fukushima, Y. & Tsuzaki, K., Jan 1 2020, In : isij international. 60, 1, p. 175-181 7 p.

Research output: Contribution to journalArticle

Open Access
Austenitic stainless steel
Entropy
Crack propagation
Fatigue crack propagation
Surface roughness

Strain rate and hydrogen effects on crack growth from a notch in a Fe-high-Mn steel containing 1.1 wt% solute carbon

Najam, H., Koyama, M., Bal, B., Akiyama, E. & Tsuzaki, K., Jan 1 2020, In : International Journal of Hydrogen Energy. 45, 1, p. 1125-1139 15 p.

Research output: Contribution to journalArticle

notches
strain rate
Strain rate
Crack propagation
solutes