Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Motomichi Koyama Last modified date:2017.05.08

Assistant Professor / Faculty of Engineering / Department of Mechanical Engineering / Faculty of Engineering


Papers
1. K. Habib, Motomichi Koyama, Hiroshi Noguchi, Impact of Mn-C couples on fatigue crack growth in austenitic steels: the attractive atomic interaction is negative or positive?, International Journal of Fatigue, 99, 2017.01.
2. B. Li, Motomichi Koyama, Eisaku Sakurada, N. Yoshimura, K. Ushioda, Hiroshi Noguchi, Underlying interstitial carbon concentration dependence of transgranular fatigue crack resistance in Fe-C ferritic steels: the kinetic effect viewpoint, International Journal of Fatigue, 98, 2017.01.
3. Motomichi Koyama, H. Li, Yasuaki Hamano, Takahiro Sawaguchi, Kaneaki Tsuzaki, Hiroshi Noguchi, Mechanical-probabilistic evaluation of size effect of fatigue life using data obtained from single smooth specimen: an example using Fe-30Mn-4Si-2Al seismic damper alloy, Engineering Failure Analysis, 72, 2017.02.
4. Motomichi Koyama, Daisuke Yamasaki, Tatsuya Nagashima, Cemal Cem Tasan, Kaneaki Tsuzaki, In situ observations of silver-decoration evolution under hydrogen permeation: effects of grain boundary misorientation on hydrogen flux in pure iron, Scripta Materialia, 129, 2017.02.
5. Motomichi Koyama, Zhao Zhang, Meimei Wang, Dirk Ponge, Dierk Raabe, Kaneaki Tsuzaki, Hiroshi Noguchi, Cemal Cem Tasan, Bone-like crack resistance in hierarchical metastable nano-laminate steels, Science, 355, 2017.03.
6. Takuro Ogawa, Motomichi Koyama, 野口 博司, Suppression Mechanism of strain-age-hardening in carbon steel associated with hydrogen uptake, ISIJ International, Accepted, 2016.10.
7. Motomichi Koyama, Yachen Yu, Jia-Xi Zhou, NobuyukiYoshimura, EisakuSakurada, KohsakuUshioda, 野口 博司, Elucidation oftheeffectsofcementitemorphologyondamage formation duringmonotonicandcyclictensioninbinarylowcarbon steelsusinginsitucharacterization, Materials Science & EngineeringA, 667, 2016.05.
8. Motomichi Koyama, Yuji Abe, Kei Saito, Eiji Akiyama, Kenichi Takai, Kaneaki Tsuzaki, Martensitic transformation-induced hydrogen desorption characterized by utilizing cryogenic thermal desorption spectroscopy during cooling, Scripta Materialia, Accepted, 2016.06.
9. Yun-Byum Ju, Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, 野口 博司, In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ε-martensitic transformation, Acta Materialia, 112, 2016.04.
10. Yasuaki Hamano, Motomichi Koyama, Shigeru HAMADA, 野口 博司, Notch Sensitivity of the fatigue limit in high-strength steel, ISIJ International, 2016.10.
11. Motomichi Koyama, Shota Okazaki, Takahiro Sawaguchi, Kaneaki Tsuzaki, Hydrogen Embrittlement Susceptibility of Fe-Mn Binary Alloys with High Mn Content: Effects of Stable and Metastable e-Martensite, and Mn Concentration, METALLURGICAL AND MATERIALS TRANSACTIONS A, 47A, 2016.06.
12. Yosuke Onishi, Motomichi Koyama, Daisuke Sasaki, 野口 博司, Characteristic fatigue crack growth behavior of low carbon steel under low-pressure hydrogen gas atmosphere in an ultra-low frequency, ISIJ International, 56, 5, 2016.05.
13. Bochuan Li, Motomichi Koyama, Eisaku Sakurada, Nobuyuki Yoshimura, Kohsaku Ushioda, 野口 博司, Potential resistance to transgranular fatigue crack growth of Fe–C alloy with a supersaturated carbon clarified through FIB micro-notching technique, International Journal of Fatigue, 87, 2016.01.
14. Motomichi Koyama, Cemal Cem Tasan, Tatsuya Nagashima, Eiji Akiyama, Dierk Raabe, Kaneaki Tsuzaki, Hydrogen-assisted damage in austenite/martensite dual-phase steel, Philosophical Magazine Letters, 96, 2016.01.
15. Kaneaki Tsuzaki, Koki Fukuda, Motomichi Koyama, Hisao Matsunaga, Hexagonal close-packedMartensite-related Fatigue Crack Growth under the Influence of Hydrogen: Example of Fe–15Mn–10Cr–8Ni–4Si Austenitic Alloy, Scripta Materialia, 113, 2016.01.
16. Motomichi Koyama, Asif Bashir, Michael Rohwerder, Sergiy V. Merzlikin, Eiji Akiyama, Kaneaki Tsuzaki, Dierk Raabe, Spatially and Kinetically Resolved Mapping of Hydrogen in a Twinning-Induced Plasticity Steel by Use of Scanning Kelvin Probe Force Microscopy, Journal of The Electrochemical Society, 162, 2015.12.
17. Zhou-Jia Xi, Motomichi Koyama, Yuichi Yoshida, Nobuyuki Yoshimura, Kohsaku Ushioda, 野口 博司, Effects of cementite morphology on short-fatigue-crack propagation in binary Fe–C steel, Philosophical Magazine Letters, 95, 2015.07.
18. Motomichi Koyama, Zhou-Jia XI, Yuichi YOSHIDA, Nobuyuki YOSHIMURA, Kohsaku USHIODA, 野口 博司, Intergranular Fatigue Crack Initiation and Its Associated Small Fatigue Crack Propagation in Water-quenched Fe–C Fully Ferritic Steel, ISIJ International, 55, 11, 2015.11.
19. Motomichi Koyama, Kaneaki Tsuzaki, ε →γ Reverse Transformation-induced Hydrogen Desorption and Mn Effect on Hydrogen Uptake in Fe–Mn Binary Alloys, ISIJ International, 55, 10, 2015.10.
20. Daisuke Sasaki, Motomichi Koyama, Kenji Higashida, Kaneaki Tsuzaki, 野口 博司, Effects of hydrogen-altered yielding and work hardening on plastic-zone evolution:A finite-element analysis, International journal o f hydrogen energy, 40, 2015.06.
21. Daisuke Sasaki, Motomichi Koyama, 野口 博司, Factorsaffectinghydrogen-assistedcrackinginacommercialtempered martensiticsteel:Mnsegregation, MnS, andthestressstatearound abnormal cracks, MaterialsScience&EngineeringA, 640, 2015.05.
22. Meimei Wang, Cemal Cem Tasan, Motomichi Koyama, Dirk Ponge, Dierk Raabe, Enhancing Hydrogen Embrittlement Resistance of Lath Martensite by Introducing Nano-Films of Interlath Austenite, METALLURGICAL AND MATERIALS TRANSACTIONS A, 47, 2016.06.
23. Huichao Li, Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, 野口 博司, Importance of crack-propagation-induced HCP-martensite in strain-controlled low cycle fatigue of high Mn austenitic steel, Philosophical Magazine Letters, 95, 2015.05.
24. Daisuke Sasaki, Motomichi Koyama, Shigeru HAMADA, Hiroshi Noguchi, Tensile properties of precracked tempered martensitic steel specimens tested at ultralow strain rates in high-pressure hydrogen atmosphere, Philosophical Magazine letters, 95, 2015.05.
25. Kensuke Yamada, Motomichi Koyama, Kaneaki Tsuzaki, Positive and negative effects of hydrogen on tensile behavior in polycrystalline Fe–30Mn–(6 x)Si–xAl austenitic alloys, Scripta Materialia, 105, 2015.05.
26. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Deformation Twinning Behavior of Twinning-induced Plasticity Steels with Different Carbon Concentrations – Part 2: Proposal of Dynamic-strain-aging-assisted Deformation Twinning, ISIJ International, 55, 8, 2015.08.
27. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Deformation twinning behavior of twinning-induced plasticity steels with different carbon concentrations -Part 1: Analyses by atomic force microscopy and electron backscatter diffraction measurements-, ISIJ International, 55, 8, 2015.08.
28. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Effects of Si on tensile properties associated with deformation-induced ε-martensitic transformation in high Mn austenitic alloys, Materials Transactions, 56, 6, 2015.06.
29. Atsushi Nishimoto, Motomichi Koyama, Shigeru Yamato, Yasuji Oda, Torhu Awane, Hiroshi Noguchi, Detection of charged hydrogen in ferritic steel through cryogenic secondary ion mass spectrometry, ISIJ International, 55, 2015.01.
30. Shigeru HAMADA, Tomoya Fujisawa, Motomichi Koyama, Norimitsu Koga, Nobuo Nakada, Toshihiro Tsuchiyama, Masaharu Ueda, Hiroshi Noguchi, Strain mapping with high spatial resolution across a wide observation range by digital image correlation on plastic replicas, MATERIALS CHARACTERIZATION, 98, 140-146, 2014.12.
31. Mayu Muramatsu, Motomichi Koyama, Ikumu Watanabe, Tensile testing with cyclic strain holding to analyze dynamic recrystallization of pure lead, Advances in Materials Science and Engineering, Accepted, 2014.05.
32. Motomichi Koyama, Cemal Cem Tasan, Eiji Akiyama, Kaneaki Tsuzaki, Dierk Raabe, Hydrogen-assisted decohesion and localized plasticity in dual phase steel , Acta Materialia, 70, 2014.02.
33. Motomichi Koyama, Hauke Springer, Sergiy V. Merzlikin, Kaneaki Tsuzaki, Eiji Akiyama, Dierk Raabe, Hydrogen embrittlement associated with strain localization in a precipitation-hardened Fe-Mn-Al-C light weight austenitic steel, International Journal of Hydrogen Energy, 39, 2014.01.
34. Motomichi Koyama, Eiji Akiyama, Takahiro Sawaguchi, Kazuyuki Ogawa, Irina V. Kireeva, Yuriy I. Chumlyakov, Kaneaki Tsuzaki, Hydrogen-assisted quasi-cleavage fracture in a single crystalline type 316 austenitic stainless steel, Corrosion Science , 75, 2013.10.
35. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Effects of static and dynamic strain aging on hydrogen embrittlement in twip steels containing Al, ISIJ International , 53, 7, 2013.07.
36. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Factors affecting static strain aging under stress at room temperature in a Fe-Mn-C twinning-induced plasticity steel, ISIJ International , 53, 6, 2013.06.
37. Motomichi Koyama, Taekyung Lee, Chong Soo Lee, Kaneaki Tsuzaki, Grain refinement effect on cryogenic tensile ductility in a Fe-Mn-C twinning-induced plasticity steel, Materials and Design , 49, 2013.08.
38. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Dierk Raabe, Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging, Acta Materialia , 61, 12, 2013.07.
39. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Microstructure characteristic and its effect on mechanical and shape memory properties in a Fe-17Mn-8Si-0.3C alloy, Journal of Alloys and Compounds , 573, 2013.03.
40. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, TWIP Effect and plastic instability condition in an Fe-Mn-C austenitic steel, ISIJ International , 53, 2, 2012.02.
41. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Hydrogen embrittlement in Al-added twinning-induced plasticity steels evaluated by tensile tests during hydrogen charging, ISIJ International , 52, 12, 2012.12.
42. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Premature fracture mechanism in an Fe-Mn-C austenitic steel, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science , 43, 11, 2012.11.
43. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Effect of deformation temperature on tensile properties in a pre-cooled Fe-Mn-C austenitic steel, Materials Science and Engineering A , 556, 2012.10.
44. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Selective appearance of epsilon-martensitic transformation and dynamic strain aging in Fe-Mn-C austenitic steels, Philosophical Magazine , 92, 24, 2012.08.
45. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Hydrogen-induced delayed fracture of a Fe-22Mn-0.6C steel pre-strained at different strain rates, Scripta Materialia , 66, 11, 2012.06.
46. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Effect of hydrogen content on the embrittlement in a Fe-Mn-C twinning-induced plasticity steel, Corrosion Science , 59, 2012.06.
47. Taekyung Lee, Motomichi Koyama, Kaneaki Tsuzaki, YouHwan Lee, Chong Soo Lee, Tensile deformation behavior of Fe-Mn-C TWIP steel with ultrafine elongated grain structure, Materials Letters , 75, 15, 2012.05.
48. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Influence of dislocation separation on dynamic strain aging in a Fe-Mn-C austenitic steel, Materials Transactions , 53, 3, 2012.03.
49. Motomichi Koyama, Eiji Akiyama, Takahiro Sawaguchi, Dierk Raabe, Kaneaki Tsuzaki, Hydrogen-induced cracking at grain and twin boundaries in an Fe-Mn-C austenitic steel, Scripta Materialia , 66, 7, 2012.04.
50. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Inverse grain size dependence of critical strain for serrated flow in a Fe-Mn-C twinning-induced plasticity steel, Philosophical Magazine Letters , 92, 3, 2012.03.
51. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Quasi-cleavage fracture along annealing twin boundaries in a Fe-Mn-C austenitic steel, ISIJ International , 52, 1, 2011.01.
52. Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Hydrogen embrittlement in a Fe-Mn-C ternary twinning-induced plasticity steel , Corrosion Science , 54, 1, 2012.01.
53. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Work hardening and uniform elongation of an ultrafine-grained Fe-33Mn binary alloy, Materials Science and Engineering A , 530, 1, 2011.12.
54. Kaoru Sekido, Takahiro Ohmura, Takahiro Sawaguchi, Motomichi Koyama, Hyoungwon Park, Kaneaki Tsuzaki, Nanoindentation/atomic force microscopy analyses of epsilon-martensitic transformation and shape memory effect in Fe-28Mn-6Si-5Cr alloy, Scripta Materialia , 65, 11, 2011.12.
55. Motomichi Koyama, Takahiro Sawaguchi, Teakyung Lee, Chong Soo Lee, Kaneaki Tsuzaki, Work hardening associated with epsilon-martensitic transformation, deformation twinning and dynamic strain aging in Fe-17Mn-0.6C and Fe-17Mn-0.8C TWIP steels, Materials Science and Engineering A , 528, 24, 2011.09.
56. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Effect of deformation temperature on work hardening behavior in Fe-17Mn-0.6C and Fe-17Mn-0.8C steels, Proceedings of the High Manganese Steels Conference 2011, 2011.05.
57. Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Si content dependence on shape memory and tensile properties in Fe-Mn-Si-C alloys , Materials Science and Engineering A , 528, 6, 2011.03.
58. Motomichi Koyama, Takahiro Sawaguchi, Kazuyuki Ogawa, Takehiko Kikuchi, Masato Murakami, Continuous transition of deformation modes in Fe-30Mn-5Si-1Al alloy , Materials Transactions , 51, 7, 2010.02.
59. Motomichi Koyama, Takahiro Sawaguchi, Masato Murakami, Kaneaki Tsuzaki, Role of Si on the shape memory property of Fe-Mn-Si-C based alloy, Proceedings of the European Symposium on Martensitic Transformations, 2009.09.
60. Motomichi Koyama, Takahiro Sawaguchi, Kazuyuki Ogawa, Takehiko Kikuchi, Masato Murakami, The improvement of shape recovery property through training treatment in an Fe-30Mn-5Si-1Al, Proceedings of the International Conference on Martensitic Transformations, 2009.07.
61. Motomichi Koyama, Takahiro Sawaguchi, Kazuyuki Ogawa, Takehiko Kikuchi, Masato Murakami, The effects of thermomechanical training treatment on the deformation characteristics of Fe-Mn-Si-Al alloys, Materials Science and Engineering A , 497, 1-2, 2008.12.
62. Kazuyuki Ogawa, Takahiro Sawaguchi, Takehiko Kikuchi, Motomichi Koyama, Masato Murakami, Influence of al concentration on deformation behavior and fracture mode of fe-30mn-6(SI, AL) alloys , Proceedings of the International Conference on Shape Memory and Superelastic Technologies, 2008.12.
63. Motomichi Koyama, Masato Muramami, Kazuyuki Ogawa, Takehiko Kikuchi, Takahiro Sawaguchi, Shape memory characteristics of Fe-30Mn-5Si-1Al and Fe-28Mn-5Si-1Al-5Cr alloys, Proceedings of the International Conference on Shape Memory and Superelastic Technologies, 2008.12.
64. Motomichi Koyama, Masato Muramami, Kazuyuki Ogawa, Takehiko Kikuchi, Takahiro Sawaguchi, AFM Observation of Microstructural Changes in Fe-Mn-Si-Al Shape Memory Alloy, Materials Transactions, 49, 4, 2008.04.
65. Takahiro Sawaguchi, Leandru-Gheorghe Bujoreanu, Takehiko Kikuchi, Kazuyuki Ogawa, Motomichi Koyama, Masato Murakami, Mechanism of reversible transformation-induced plasticity of Fe–Mn–Si shape memory alloys, Scripta Materialia, 59, 2008.06.
66. Motomichi Koyama, Masato Muramami, Kazuyuki Ogawa, Takehiko Kikuchi, Takahiro Sawaguchi, Influence of Al on Shape Memory Effect and Twinning Induced Plasticity of Fe-Mn-Si-Al System Alloy, Materials Transactions, 48, 10, 2007.10.