Shiro Torizuka

Senior Researcher
Metallurgical Processing Group

--------------------------------------------------------------------------------

Research Topics

Metallurgy on ultra grain refinement

Process technology on creation of ultrafine grained steel

List of Articles

Paper in Journal

  1. Y. Furuya, S. Matsuoka, S. Shimaraku, T. Hanamura and S. Torizuka, Effects of Strengthening Mechanisms on Fatigue Properties of Ultrafine Ferrite-Cementite Steels, Tetsu-to-Hagane, 92, 1 (2006) pp46-52 *Japanese
  2. S. Torizuka, A. Ohmori, S.V.S.N. Murty and K. Nagai, Effect of strain on the microstructure and mechanical properties of multi-pass warm caliber rolled low carbon steel, Scripta Materialia 54 (2006) pp563-568
  3. S. Torizuka, A. Ohmori, SVS Murty and K. Nagai, High Z - Large Strain Deformation Processing and its Applications, Materials Science Forum, 503-504 (2006) pp329-334

  4. S.V.S. Murty, S. Torizuka and K. Nagai, Controlling mechanism of ferrite grain size generated through large strain deformation of 0.15C steel, Materials Science Forum, 503-504 (2006) pp687-692

  5. S.V.S. Murty, S. Torizuka and K. Nagai, Dynamic recrystallization of ferrite during warm deformation of ultrafine grained ultra-low carbon steel, Scripta Materialia, 53, 6 (2005) pp763-768

  6. T. Inoue, S. Torizuka and K. Nagai, Novel Rod Rolling Process for Designing Efficiently Ultrafine-Grained Steel Bars Based on Numerical Analysis, J. Japan Inst. Metals, 69, 11(2005) pp934-942
    *Japanese

  7. S.V.S. Narayana Murty, S. Torizuka and K. Nagai, Microstructural evolution during simple, heavy warm compression of a low carbon steel: Development of a processing map, Materials Science and Engineering A, 410-411 (2005) pp319-323

  8. S.V.S. Narayana Murty, S. Torizuka and K. Nagai, Ferrite Grain Size Formed by Large Strain-High Z Deformation in a 0.15C Steel, Materials Transactions, 46, 11 (2005) pp2454-2460

  9. S.V.S. Narayana Murty, S. Torizuka and K. Nagai, Microstructural and Micro-textural Evolution during Single Pass High Z-large Strain Deformation of a 0.15C Steel, ISIJ International,45 ,11 (2005) pp1651-1657

  10. K. Enami, K. Nagai, S. Torizuka and T. Inoue, The Neck Growth Model in a Smooth Round Tension and a Circumferentially Notched Tension, Tetsu-to-Hagane, 91, 10 (2005) pp769-774*Japanese

  11. Y. Furuya, S. Matsuoka, S. Shimakura, T. Hanamura and S. Torizuka, "Effects of carbon and phospohrus addition on the fatigue properties of ultrafine-grained steels", Scripta Materialia, 52 (2005), pp1163-1167

  12. S.Torizuka, "Creation of Ultrafine-grained Steel by High Z - Large Strain Deformation", Journal of the Japan Welding Society, Vol.74, No.2 (2005) pp13-17 *Japanese
  13. S. Torizuka, "Production of Ultrafine-grained Steel Bar and Plate by High Z-large Strain Deformation in Ferrite Region", Ferrum, Vol. 3 (2005) No.10, pp188-195*Japanese

  14. S.V.S. Narayana Murty, S.Torizuka, K.Nagai, N.Koseki and Y.Kogo, "Classification of microstructural evolution during large strain high Z deformation of a 0.15 carbon steel", Scripta Materialia, 52 (2005) pp713-718

  15. A. Ohmori, S. Torizuka, K. Nagai, N. Koseki and Y. Kogo, "Effect of Deformation Temperature and Strain Rate on Evolution of Ultrafine-Grained Structure through Single-Pass Large-Strain Warm Deformation in a Low Carbon Steel", Materials Transactins, 45, 7 (2004) pp2224-2231

  16. A. Ohmori, S. Torizuka and K. Ngai "Strain-hardening due to dispersed cementite for low carbon ultrafine-grained steels", ISIJ International, 44, 6 (2004) pp1063-1071
  17. S. Matsuoka, Y. Furua, T. Hanamura and S. Torizuka, Fine-grained Ferritic Steels without Upper/Lower Yielding, Tetsu-to-Hagane, Vol.90 (2004） No.3 pp162-169 *Japanese

  18. T. Itagaki, K. Nakazato, H. Kutsumi and S. Torizuka, Steam oxidation resistant protective layer on ferritic steels formed by heavy deformation and pre-oxidation treatment, JOURNAL OF THE JAPAN INSTITUTE OF METALS, 67, 4, 189-192 (2003) *Japanese

  19. T. Yamashita, S. Torizuka and K. Nagai, Effect of manganese segregation on fine-grained ferrite structure in low-carbon steel slabs, ISIJ International, 43, 11, 1833-1841 (2003)

  20. S. Torizuka and K. Nagai, Thickness of Pancake Austenite Comtrolling the Size of Ferrite Transformed from Variously Deformed Austenite, Materials Science Forum, 426-432 (2003) pp4573-4578

  21. A. Ohmori, S. Torizuka and K. Nagai, Properties of Warm-rolled Steel Plates with Ultrafine-grained Ferrite and Cementite Structures, Tetsu-to-Hagane, 89, 7 (2003) pp765-772*Japanese

  22. A. Ohmori, S. Torizuka, K. Nagai, N. Koseki and Y. Kogo, Evoluation of Ultrafine-grained Ferrite Structure through Multi-pass Warm Caliber-rolling, Tetsu-to-Hagane, 89, 7, (2003) pp781-788*Japanese

  23. H.Nakajima, T.Yamashita, T.Inoue, S.Torizuka, T.Hanamura, K.Nagai, Characteristics of Rolled Steel Plates with Shear Deformation, Tetsu-to-Hagane, printing 89, 2 (2003) *Japanese

  24. S. Torizuka, K. Nagai, Relationship between Thickness of Pancake Austenite and Thickness of Grain Boundary Ferrite, Tetsu-to-Hagane, 88, 3, 2002, pp148-154

  25. K.Nagai, A.Ohmori, S.Torizuka, Future Thermo-mechanical Processing Technology for Ultra Grain Refinement - II - Recrystallization-, Oct., 2002, pp111-129 *Japanese

  26. A.Ohmori, S.Torizuka, K.Nagai, K.Yamada, Y.Kogo, Evolution of Ultrafine-grained Structure through High Strain- High Z Deformation in a Low Carbon Steel, Tetsu-to-Hagane, 88, 12 (2002), pp857-864 *Japanese

  27. T.Inoue, K.Nagai, Effect of Shear Deformation on Refinement of Crystal Grains,Materials Science and Technology,18 ,(2002), pp1007-1015

  28. Dong-Woo Suh, S.Torizuka, A.Ohmori, T.Inoue, K.Nagai, Dynamic Restoration Process of Ni-30Fe Alloy during Hot Deformation,ISIJ International, 42, 4, (2002), pp432-439

  29. Dong-Woo Suh, T.Inoue, S.Torizuka, A.Ohmori, K.Nagai, Serration of Grain Boundary in a Ni-30Fe alloy Due to High Temperature Deformation, ISIJ International, 42, 9, (2002), pp1026-1032

  30. T.Inoue, S.Torizuka, K.Nagai, Development of Uniformly Fine-grained Ferrite Structure through Multidirectional Deformation, NETSU SHORI, (Japanese) 42, 6, (2002), pp385-387 *Japanese

  31. S. Torizuka, K. Nagai, Novel processing of recyclable and high performance steel bar, J. Advanced Science, 13, 3, 2002, pp343-347

  32. T.Hanamura, T.Yamashita, O.Umezawa, S.Torizuka, K.Nagai, Improvement of Strength-and-Toughness Balance of Recycled Steel through Ultrafinement of Grain Size, J. Advanced Science, 13, 3 (2002), pp179-182　

  33. S.Torizuka, K.Nagai, Relationship between Thickness of Pancake Austenite and Thickness of Grain Boundary Ferrite, Tetsu-to-Hagane, 88, 3, (2002), pp148-154 *Japanese

  34. 鳥塚史郎, 長井寿, 佐藤彰, STX−２１プロジェクトにおける８００MPa鋼創製研究の現状, 塑性と加工, 42, 483, （2001） pp287−292 *Japanese
  35. T.Inoue, S.Torizuka and K.Nagai, Formation of Uniformly Fine-grained Ferrite Structure through Multi-direction Deformation, MATERIALS SCIENCE & TECHNOLOGY, 17, (2001) 1329-1338.
  36. T.Inoue, S.Torizuka and K.Nagai, Effect of Plastic Strain on Grain Size of Ferrite Transformed from Deformed Austenite in Si-Mn Steel, MATERIALS SCIENCE & TECHNOLOGY, 17, (2001), pp1380-1388
  37. 鳥塚史郎, 実製造設備による強度2倍の棒鋼の製造, 工業材料, 48, 7, (2000), pp64-67 *Japanese
  38. 鳥塚史郎, 梅澤修, 津崎兼彰, 長井寿, 低炭素鋼の塑性変形されたオーステナイトの粒界から生成するフェライト粒の形、大きさと結晶方位, 鉄と鋼, 86, 12, （2000） pp801−806 *Japanese
  39. 鳥塚史郎, 井上忠信, 長井寿, 多方向加工による均一微細フェライト粒組織の形成, 鉄と鋼, 86, 12, （2000） pp807−814 *Japanese
  40. T. Inoue, S. Torizuka and K. Nagai, Numerical Analysis of Plastic Strain Distribution through Multi-directional Deformation, Tetsu-to-Hagane, Vol. 86, No.12, 2000, pp.793-800.*Japanese
  41. T. Hanamura, H. Shibata, Y. Waseda, H. Nakajima, S. Torizuka, T. Takahashi and K. Nagai, In-situ observation of intragranular ferrite nucleation at oxide particles, ISIJ International, 39, 1188-1193 (1999)

  42. S. Torizuka, O. Umezawa, K. Tsuzaki and K. Nagai, Refinement of Ferrite-Pearlite Structures through Transformation from Heavily Deformed Austenite in a Low Carbon Si-Mn Steel, Microalloying in steel: New trends for the 21st century (1998), pp225-230.
  43. T.Minote, S.Torizuka, A.Ogawa and M.Niikura, Modeling of Transformation Behavior and Compositional Partitioning in TRIP Steel, ISIJ International, 36, 201- (1996)

  44. Shiro Torizuka and Teruo Kishi, Effect of SiC on Sinterability and Mechanical Properties of Titanium Nitride, Titanium Carbide and Titanium Diboride, Materials Transactios, JIM, 37, 782-787 (1996).

  45. 蓑手徹、鳥塚史郎、小川厚、新倉正和, 残留オーステナイト型複合組織鋼の相変態と成分分配挙動, 鉄と鋼, 81, 918-923 (1995).*Japanese

  46. Shiro Torizuka and Teruo Kishi Sinterability and Mechanical properties of TiB2 without additives, Journal of the Ceramic Society of Japan, 103, 1065-1069 (1995).

  47. Shiro Torizuka, Kaoru Sato, Hiroaki Nishio and Teruo Kishi, Effect of SiC on Interface Reaction and Sintering Mechanism of TiB2, Journal of American Ceramic Society, 78, 1606-1610 (1995).

  48. 鳥塚史郎、西尾浩明、岸輝雄, 助剤無添加TiB2の焼結性と力学的性質, 日本セラミックス協会学術論文誌, 103, 1077-1081 (1995).*Japanese

  49. Shiro Torizuka, Jun Harada Hideharu Yamamoto Hiroaki Nishio, Atsushi Chino and Yoichi Ishibashi, Effect of ZrO2 Addition on the Mechanical Properties of TiB2 HIP'ed Compacts, Journal of the Ceramic Society of Japan, 100, 271-276 (1992)

  50. Shiro Torizuka, Kaoru Sato, Jun Harada, Hideharu Yamamoto and Hiroaki Nishio, Microstructure and Sintering Mechanism of TiB2-ZrO2-SiC Composite, Journal of the Ceramic Society of Japan, 100, 401-406 (1992)

  51. 鳥塚史郎、千野淳、原田淳、山本秀治、西尾浩明、石橋耀一 , TiB2の力学的性質に及ぼすZrO2添加の影響, 日本セラミックス協会学術論文誌, 100, 259-265 (1992).*Japanese

  52. Shiro Torizuka, Kaoru Sato, Jun Harada, Hideharu Yamamoto and Hiroaki Nishio, Microstructure and Sintering Mechanism of TiB2-ZrO2-SiC Composite, 日本セラミックス協会学術論文誌, 100, 392-397 (1992).*Japanese

  53. 鳥塚史郎、原田淳、山本秀治、西尾浩明、千野淳、石橋耀一 , TiB2-(2mol%Y2O3-ZrO2) 複合材料の力学的性質と焼結性に及ぼすSiC添加の影響, 日本セラミックス協会学術論文誌, 100, 691-696 (1992)*Japanese

  54. Shiro Torizuka, Jun Harada Hideharu Yamamoto Hiroaki Nishio, Atsushi Chino and Yoichi Ishibashi, Effect of SiC addition on the Mechanical Properties and Sinterability of TiB2-(2mol%Y2O3-ZrO2) Composite, Journal of the Ceramic Society of Japan Inter Ed., 100, 685-690 (1992).

  55. 鳥塚史郎、西尾浩明, TiB2-(2mol%Y2O3-ZrO2)焼結体の作製と機械的性質, 粉体および粉末冶金, 38, 723-728 (1991).*Japanese

  56. 千野淳、岩田英夫、鳥塚史郎、藪田和哉 レーザーラマン分光法による窒化ケイ素焼結体中の遊離ケイ素定量法, 日本セラミックス協会学術論文誌, 97, 1466-1470 (1989).*Japanese

  57. Shiro Torizuka, Kazuya Yabuta and Hiroaki Nishio, Fabrication of Si3N4 by Sinter/HIP, ISIJ International, 29, 734-737 (1989)

  58. Shiro Torizuka, Kazuya Yabuta and Hiroaki Nishio, Applopriate Sinter/HIP Condition to Fabricate a High Strength Si3N4, ISIJ International, 29, 740-745 (1989)

  59. S.Torizuka J.Harada and H.Nishio High Strength TiB2, Ceramic Engineering and Science, 11, 1454-1457 (1989).

  60. 鳥塚史郎、西尾浩明, TiB2-ZrO2焼結体の作製と機械的性質, 粉体および粉末冶金, 36, 100-104 (1989)*Japanese

Proceedings

  1. S.Torizuka, K.Nagai, A.Ohmori, Strain-hardening design with despersed cementite for low carbon ultrafine-grained steels, Proceedings of COM 2004 (2004) pp171-178

  2. SVS Murty, S. Torizuka and K. Nagai, Microstructual Evolution during Simple Heavy Warm Compression of a 0.15C Steel, Proceedings of 8th Ultra-Steel Workshop (2004) pp234-235

  3. S.Torizuka, K.Nagai, A.Ohmori, Evolution of Ultrafine-grained Structure by Large Strain - High Z Deformation in a 0.15% Carbon Steel, Proceedings of ICASS 2004 (2004) pp114-118

  4. A.Ohmori, S.Torizuka, K.Nagai, N.Koseki, and Y.Kogo, Ultrafine-grained Ferrite Structure through Multi-pass Warm Caliber-rolling, Proceeding of Seventh Workshop on Ultra-Steels (2003) pp278-279

  5. S.Torizuka, E.Muramatsu and K.Nagai, Development of Ultra Steel Screws, Proceeding of Seventh Workshop on Ultra-Steels (2003) pp526-527

  6. S.Torizuka and K.Nagai, Thickness of Pancake Austenite Controlling the Size of Ferrite Transformed from Variously Deformed Austenite, Materials Sicence Forum 426-432 (2003) pp4573-4577

  7. S. Torizuka, A. Ohmori, K. Nagai, K. Yamada, N. Koseki, Y. Kogo, Formation of Ultrafine-grained Ferrite Structure through Severe Deformation and Recrystallization, 鍛造分科会・第73回研究集会概要集　熱間鍛造品における高品質・高精度化, 2002, pp21-24*Japanese

  8. S. Torizuka, T. Inoue, A. Ohmori, A. Yamashita, T. Hanamura, K. Nagai, Achievements in Creation of Utlrafine-Grained Steel "The 1st International Conference on Advanced Structural Steels, Proceedings of the 1st ICASS, 2002, pp89-90

  9. S. Torizuka, T. Inoue, A. Ohmori, A. Yamashita, T. Hanamura, K. Nakazato, K. Nagai, Creation of 800MPa ultrafine-grained steel, Sixth Workshop on Ultra Steel New Structural Steels and New Design of Constructions, 2002, pp210-211

  10. S. Torizuka, Thickness of pancake γcontrolling the size of a transformed from deformed γ, CAMP-ISIJ, 15, 6, 2002, pp1146-1146

  11. S. Torizuka, Creation and application of ultrafine-granied steel, NIMSフォーラム2002 概要集, 2002, pp63-64*Japanese

  12. S. Torizuka, Application of ultrafine-grained steel for precision parts, 第55回日本熱処理技術協会講演大会講演概要集, 2002, pp53- 54*Japanese

  13. S. Torizuka, K. Nagai, S. Genda and Y. Kogo, Ultrafine-Grained Ferrite Formation at Grain Boundaries of Pancake-like Austenite after Heavy Compression, Proceeding of International Symposium on Ultrafine Grained Steels (ISUGS 2001), pp218-221 (2001).

  14. S. Torizuka and K. Nagai, Relationship between thickness of pancake γ　and thickness of grain boundary α, CAMP-ISIJ Vol.14 (2001) pp1045
  15. S. Torizuka and K. Nagai, Significance of austenite grain size for ultrafine-grained ferrite structure, CAMP-ISIJ Vol.14 (2001) pp402-405
  16. 鳥塚史郎*Japanese
    800MPa超微細組織鋼作製の到達点と今後　　
    第５回超鉄鋼ワークショップ概要集　p70 -71　（2001）
  17. 鳥塚史郎　梅澤修　津崎兼彰　長井寿*Japanese
    粒界αの方位分散におよぼす塑性変形の影響　　
    第５回超鉄鋼ワークショップ概要集　p402 -405　（2001）
  18. Shiro Torizuka, Osamu Umezawa, Kaneyoshi Tsuzaki and Kotobu Nagai
    Relationship between size, shape and crystallographic orientation of ferrite grains formed at deformed austenite grain boundaries in a low carbon steel
    Proceedings of the 10th Iketani Conference on Materials Research toward the 21st Centrury (2000) pp123-124
  19. 鳥塚史郎　井上忠信　長井寿*Japanese
    多方向加工による組織制御（その２多方向加工シュミレータ）
    CAMP−ISIJ Vol.13 No.3 （2000） p642
  20. 鳥塚史郎*Japanese
    温間多軸加工により作製された微細フェライト粒鋼の強度と靭性
    金属学会セミナーテキスト　結晶粒微細化への新アプローチ　（2000） p77-82
  21. Shiro Torizuka Osamu Umezawa Kaneaki Tsuzaki Kotobu Nagai
    RELATIONSHIP BETWEEN SIZE, SHAPE AND CRYSTALLOGRAPHIC
    ORIENTATION OF FERRITE GRAINS
    Proc. of HSLA Steels '2000 p255-259
  22. 鳥塚史郎　井上忠信　長井寿*Japanese
    多方向加工による組織制御　　
    第8回機械材料・材料加工技術講演会　講演論文集 No. 00-36　p357 -358 （2000）　
  23. Shiro Torizuka and Kotobu Nagai
    Novel processing of recyclable and high performance steel bar　
    J. Advanced Science
  24. 鳥塚史郎　花村年裕　林透　中嶋宏　長井寿*Japanese
    超微細フェライト低炭素鋼棒材の破壊と靭性
    溶接構造シンポジウム1999講演論文集
  25. 鳥塚史郎*Japanese
    強加工による組織微細化
    CAMP-ISIJ (1999)
  26. 鳥塚史郎*Japanese
    強加工-制御冷却によるSi-Mn鋼微細フェライト-パーライトの形成
    CAMP-ISIJ Vol. 11 No.6 (1998) pp1027-1030
  27. 鳥塚史郎　梅澤修　津崎兼彰　長井寿*Japanese
    強加工・制御冷却による粗大オーステナイト粒組織からの微細フェライト-パーライト粒組織からの微細フェライト-パーライト組織の形成
    CAMP-ISIJ Vol. 11 No.3 (1998) pp565
  28. 鳥塚史郎　梅澤修　津崎兼彰　長井寿*Japanese
    未結晶オーステナイト域大圧下-制御冷却によるSi-Mn鋼フェライト組織の微細化
    超鉄鋼ワークショップ概要集　(1998) pp40-41
  29. 鳥塚史郎　梅澤修　津崎兼彰　長井寿*Japanese
    未結晶オーステナイト域大圧下-制御冷却によるSi-Mn鋼フェライト組織の微細化CAMP-ISIJ Vol. 10 No.6 (1997) pp6