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Eiji Akiyama

Tohoku University - Institute for Materials Research

Sendai

Japan

  • Tohoku University - Institute for Materials Research

SCHOLARLY PAPERS

10

DOWNLOADS

649

TOTAL CITATIONS

4

Scholarly Papers (10)

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1.

Austenite Stabilization Kinetics in Early Stage of Austempering Treatment in Trip-Aided Steel Using In-Situ Neutron Diffraction Technique

Downloads 138 (530,816)
Citation 1

Austenite Stabilization Kinetics in Early Stage of Austempering Treatment in Trip-Aided Steel Using In-Situ Neutron Diffraction Technique

Number of pages: 16 Posted: 08 Sep 2021
Yutao Zhou, Tomohiko Hojo, Amane Kitahara, Yusuke Onuki, Shigeo Sato, Motomichi Koyama and Eiji Akiyama
Tohoku University - Institute for Materials Research, Tohoku Gakuin University, Kobelco Research Institute, Inc., Ibaraki University- Frontier Research Center for Applied Atomic Sciences, Ibaraki University- Graduate School of Science and Engineering, Tohoku University - Institute for Materials Research (IMR) and Tohoku University - Institute for Materials Research
Downloads 71 (879,563)
Citation 1

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Retained austenite, Austempering treatment, TRIP-aided steel, In-situ neutron diffraction, phase transformation

Austenite Stabilization Kinetics in Early Stage of Austempering Treatment in Trip-Aided Steel Using In-Situ Neutron Diffraction Technique

Number of pages: 13 Posted: 02 Aug 2021
Yutao Zhou, Tomohiko Hojo, Amane Kitahara, Yusuke Onuki, Shigeo Sato, Motomichi Koyama and Eiji Akiyama
Tohoku University - Institute for Materials Research, Tohoku Gakuin University, Kobelco Research Institute, Inc., Ibaraki University- Frontier Research Center for Applied Atomic Sciences, Ibaraki University- Graduate School of Science and Engineering, Tohoku University - Institute for Materials Research (IMR) and Tohoku University - Institute for Materials Research
Downloads 67 (912,349)

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2.

Hydrogen-Induced Delayed Fracture in a 1.5 GPa Dual-Phase Steel Via Coalescence of Surface and Sub-Surface Cracks

Number of pages: 28 Posted: 07 Nov 2022
Rama Srinivas Varanasi, Motomichi Koyama, Yuki Shibayama, Shuya Chiba, Saya Ajito, Tomohiko Hojo and Eiji Akiyama
Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research (IMR), Japan Atomic Energy Agency, Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research (IMR), Tohoku Gakuin University and Tohoku University - Institute for Materials Research
Downloads 97 (704,534)

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Crack propagation, Dual-phase steels, Hydrogen embrittlement, Delayed fracture, U-bend test

3.

Comparative Study of Stress and Strain Partitioning Behaviors in Medium Manganese and Transformation-Induced Plasticity-Aided Bainitic Ferrite Steels

Number of pages: 9 Posted: 07 Sep 2021
Tomohiko Hojo, Motomichi Koyama, Bakuya Kumai, Yuki Shibayama, Ayumi Shiro, Takahisa Shobu, Hiroyuki Saitoh, Saya Ajito and Eiji Akiyama
Tohoku Gakuin University, Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research, Tohoku University - Institute for Materials Research, National Institutes for Quantum and Radiological Science and Technology, Japan Atomic Energy Agency, National Institutes for Quantum and Radiological Science and Technology, Tohoku University - Institute for Materials Research and Tohoku University - Institute for Materials Research
Downloads 94 (720,278)
Citation 2

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martensitic phase transformation, work hardening, synchrotron radiation

4.

Novel Tough Fe-Mo Intermetallic Composite Synthesized Via Diffusional-Displacive Mixed-Mode Transformation

Number of pages: 19 Posted: 13 Feb 2024
Rama Srinivas Varanasi, Srikakulapu Kiranbabu, Reina Utsumi, Hiroyuki Saitoh, Ronald Schnitzer, Eiji Akiyama and Motomichi Koyama
Tohoku University - Institute for Materials Research (IMR), Montanuniversität Leoben, QST hospital (former NIRS Hospital) - National Institutes for Quantum Science and Technology, National Institutes for Quantum and Radiological Science and Technology, Montanuniversität Leoben - Department of Materials Science, Tohoku University - Institute for Materials Research and Tohoku University - Institute for Materials Research (IMR)
Downloads 86 (765,566)

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Mixed-mode transformation, Displacive transformation, Widmanstätten lath, Intermetallic composite, Fe-Mo alloy

5.

Hydrogen Embrittlement Property of a 1.5 GPA Dual-Phase Steel Evaluated Using U-Bending Test: A Comparison with Tempered Martensitic Steel with Identical Tensile Strength

Number of pages: 15 Posted: 09 May 2023
Shuya Chiba, Motomichi Koyama, Tomohiko Hojo, Saya Ajito, Yuki Shibayama, Rama Srinivas Varanasi and Eiji Akiyama
Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research (IMR), Tohoku Gakuin University, Tohoku University - Institute for Materials Research, Japan Atomic Energy Agency, Tohoku University - Institute for Materials Research (IMR) and Tohoku University - Institute for Materials Research
Downloads 59 (970,490)

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A. steelB. SEMB. galvanostaticC. hydrogen embrittlement, C. effects of strain

6.

Mixed Type Brittle Fracture in 1.5 GPA Dual-Phase Steel Via {100} Ferrite Cleavage Cracking

Number of pages: 23 Posted: 20 Jul 2022
Rama Srinivas Varanasi, Motomichi Koyama, Yuki Shibayama and Eiji Akiyama
Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research (IMR), Japan Atomic Energy Agency and Tohoku University - Institute for Materials Research
Downloads 51 (1,052,702)

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Dual phase steels, Ferrite brittle fracture, Cleavage cracking, Ferrite {100} cleavage, Crack propagation

7.

Hydrogen-Accelerated Fatigue Crack Growth of Equiatomic Fe–Cr–Ni–Mn–Co High-Entropy Alloy Evaluated by Compact Tension Testing

Number of pages: 16 Posted: 28 Apr 2022
Motomichi Koyama, Shunsuke Mizumachi, Eiji Akiyama and Kaneaki Tsuzaki
Tohoku University - Institute for Materials Research (IMR), affiliation not provided to SSRN, Tohoku University - Institute for Materials Research and National Institute for Materials Science
Downloads 47 (1,097,529)

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fracture behavior, fatigue, compact tension test, hydrogen, High-entropy alloy, intergranular crack

8.

Temperature Dependence of Hydrogen-Assisted Damage Evolution and Fracture Behavior in Trip-Aided Bainitic Ferrite Steel

Number of pages: 26 Posted: 09 Aug 2023
Yutao Zhou, Tomohiko Hojo, Motomichi Koyama, Saya Ajito and Eiji Akiyama
Tohoku University, Tohoku Gakuin University, Tohoku University - Institute for Materials Research (IMR), Tohoku University - Institute for Materials Research and Tohoku University - Institute for Materials Research
Downloads 29 (1,332,057)

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hydrogen embrittlement, Deformation temperature, Micro-damage, TRIP-aided steel

9.

Mesoscale Quantification of Grain Boundary Character and Local Plasticity in Hydrogen-Assisted Intergranular and Intergranular-Like Cracking Paths in Tempered Martensitic Steel

Number of pages: 21 Posted: 05 Jul 2023
Tingshu Chen, Motomichi Koyama, Takahiro Chiba, Eiji Akiyama and Kenichi Takai
Tohoku University, Tohoku University - Institute for Materials Research (IMR), Sophia University, Tohoku University - Institute for Materials Research and Sophia University
Downloads 29 (1,332,057)
Citation 1

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Hydrogen embrittlement, Martensitic steel, Grains and interfaces, fracture behaviour, Iron alloys, plasticity

10.

The effect of long‑term thermal aging on corrosion of Z3CN20‑09M cast austenitic stainless steel in simulated PWR primary water

Downloads 19 (1,459,862)

The effect of long‑term thermal aging on corrosion of Z3CN20‑09M cast austenitic stainless steel in simulated PWR primary water

Number of pages: 29 Posted: 24 Feb 2026
Jun Xiao, Ting Xiao, Xiang-yu Zhong, Yu Qi Zheng, Hiroshi Kakinuma, Qi Xu, Hao Wang, Eiji Akiyama and Tetsuo Shoji
affiliation not provided to SSRN, affiliation not provided to SSRN, Tohoku University, affiliation not provided to SSRN, Tohoku University, affiliation not provided to SSRN, affiliation not provided to SSRN, Tohoku University - Institute for Materials Research and Tohoku University
Downloads 13 (1,579,999)

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Z3CN20-09M, cast austenitic stainless steel, thermally aging, corrosion, PWR

The effect of long‑term thermal aging on corrosion of Z3CN20‑09M cast austenitic stainless steel in simulated PWR primary water

Number of pages: 28 Posted: 18 Mar 2026
Jun Xiao, Ting Xiao, Xiang-yu Zhong, Yu Qi Zheng, Hiroshi Kakinuma, Qi Xu, Hao Wang, Eiji Akiyama and Tetsuo Shoji
affiliation not provided to SSRN, affiliation not provided to SSRN, Tohoku University, affiliation not provided to SSRN, Tohoku University, affiliation not provided to SSRN, affiliation not provided to SSRN, Tohoku University - Institute for Materials Research and Tohoku University
Downloads 6 (1,635,165)

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Key words: Z3CN20-09M, cast austenitic stainless steel, thermally aging, corrosion, PWR