-2005-
H. Kim, Y. Kobayashi, S. Tsukamoto and K. Nagai, Effect of cooling rate on microstructure evolution of rapidly cooled high-impurity steels, Materials Science and Engineering A, 403, 1-2 (2005) pp311-317

Z.Liu, Y.Kobayashi and K.Nagai, Effect of Phosphorus on Sulfide Precipitation n Strip Casting Low Carbon Steel, Materials Transactions, 46,1 (2005) pp26-30

-2004-
Y. Kobayashi and K. Nagai, Impurities in Steel and Microstructure of Rapid Solidification, 43, 9 (2004) pp730-736 *Japanese

Z. Liu, Y. Kobayashi and K. Nagai, Crystallography and precipitation kinetics of copper sulfide in strip casting low carbon steel, ISIJ International, 44, 9 (2004) pp1560-1567

N. Yoshida, N. Kobayashi and K. Nagai, Prediction of As-cast Austenite Grain Size for Near-net-shape CC, Tetsu-to-Hagane, 90 (2004) 4, pp198-205

N. Yoshida, O. Umezawa and K. Nagai, Analysis on refinement of columnar γ grain by phosphorus in continuously cast 0.1 mass% carbon steel, ISIJ International, 44 (2004) 3, pp547-555

Y. Kobayashi, N. Yoshida and K. Nagai, Thermodynamics of phosphorus in the MnO-SiO2-FetO system, ISIJ International, Vol.44 (2004), No. 1, pp21-26

-2003-
N. Yoshida, O. Umezawa and K. Nagai, Influence of Phosphorus on Solidification Structure in Continuously Cast 0.1 mass% Carbon Steel, ISIJ International, 43, 3 (2003) 348-357

-2002-
O. Umezawa, N. Yoshida, K. Hirata, T. Higuchi, N. Sakuma and K. Nagai, Continuously cast 0.1wt% C steels with high phosphorus: microstructual design and control , J. Advanced Science, 13, 3 (2001) pp175-178

K. Hirata, O. Umezawa and K. Nagai, Microstructure of Cast Strip in 0.1 mass% C Steels Containing P, Mater.Trans, 43, 3 (2002) pp305-310


(Deformation, Thermomechanical Treatment)
-2006-
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

-2005-
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

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

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 Int'l, 45 (2005) 11, pp1651-1657

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

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

-2004-
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

A. Ohmori, S. Torizuka and K. Nagai, Strain-hardening due to dispersed cementite for low carbon ultrafine-grained steels, ISIJ Intl, Vol.44 (2004), No. 6, pp1063-1071

T. Hanamura, F. Yin and K. Nagai, Ductile-brittle transition temperature of ultrafine ferrite/cementite microstructure in a low carbon steel controlled by effective grain size, ISIJ Int'l, 44 (2004) 3, pp610-617

Z. Liu, Y. Kobayashi and K. Nagai, Effect of Nano-Scale Copper Sulfide Particles on the Yield Strength and Work Hardening Ability in Strip Casting Low Carbon Steel, Materials Transactions, 45, 2 (2004) pp479-487

-2003-
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 (2003) pp1833-1841

A. Ohmori, S. Torizuka, K. Nagai, N. Koseki and Y. Kogo, Evolution of Ultrafine-grained Ferrite Structure through Multi-pass Warm Caliber-rolling, Tetsu-to-Hagane, Vol.89, No.7 (2003) pp781-788

A. Ohmori, S. Torizuka and K. Nagai, Properties of Warm-rolled Steel Plates with Ultrafine-grained Ferrite and Cementite Structures, Tetsu-to-Hagane,Vol.89, No.7 (2003) pp765-772

H. Nakajima, A. Yamashita, T. Inoue, S. Torizuka, T. Hanamura and K. Nagai, Characteristics of Rolled Steel Plates with Shear Deformation, Tetsu-to-Hagane, 89, 2 (2002) pp281-288

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

A. Ohmori, S. Torizuka, K. Nagai, K. Yamada and 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

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

T. Inoue, S. Ochiaki, M. Hojo and K. Nagai, Fracture Criterion of Single Fiber-Composite under Thermal and Tensile Loadings Based on Energy Release Rate, Zairyo (2002) accepted *Japanese

T. Inoue, S. Torizuka and K. Nagai, Development of Uniformly Fine-grained Ferrite Structure through Multidirectional Deformation, Journal of the Japan Society for Heat Treatment, 42, 6 (2002) pp385-387 *Japanese

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

I. Salvatori, T. Inoue and K. Nagai, Ultrafine grain structure through dynamic recrystallization for type 304 stainless steel, ISIJ International,42, 7 (2002) pp744-750

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

-2001-
S. Torizuka and K. Nagai, Novel processing of recyclable and high performance steel bar, J. Advanced Science, 13, 3 (2001) pp343-347

T. Inoue, S. Torizuka, K. Nagai, K. Tsuzaki and T. Ohashi, Effect of Plastic Strain on Grain Size of Ferrite Transformed from Deformed Austenite in Si-Mn Steel, MATERIALS SCIENCE & THECHNOLOGY, 17-12 (2001) pp1580-1588

T. Inoue, S. Torizuka and K. Nagai, Formation of Uniformly Fine-grained Ferrite Structure through Multi-directional Deformation, MATERIALS SCIENCE & THECHNOLOGY, 17-11 (2001) pp1329-1338

-2000-
S. Torizuka, T. Inoue, K. Nagai, Uniform Formation of Fine Grained Ferrite Structure through Multi-directional Deformation, Tetsu-to-Hagane, 86, 12 (2000) pp801-806 *Japanese

S. Torizuka, T. Inoue, K. Nagai, Shape, size and crystallographic orientation of the ferrite grains formed at grain boundaries of deformed austenite in a low carbon steel, Tetsu-to-Hagane, 86, 12 (2000) pp807-814 *Japanese

T. Inoue, S. Torizuka and K. Nagai, Numerical Analysis of Plastic Strain Distribution through Multi-directional Deformation, Tetsu-to-Hagane, 86, 12 (2000) pp793-800 C

S. Takagi, T. Inoue, T. Hara, M. Hayakawa, K. Tsuzaki and T. Takahashi, Parameters for the Evaluation of Hydrogen Embrittlement of High Strength Steel, Tetsu-to-Hagane, 86-10 (2000) pp689-696 *Japanese


(Properties Evaluation)
-2006-
M. Zhao, T. Hanamura, H. Qiu, K. Nagai and K. Yang, Grain growth and Hall-Petch relaion in dual-sized ferrite/cementite stel with nano-sized cementite particles in a heterogeneous and dense distribution, Scripta Materialia, 54, 6 (2006) pp1193-1197

M. Zhao, T. Hanamura, H. Qiu, K. Nagai and K. Yang, Dependence of strength-elongation balance on the volumen fraction of cementite particles in ultrafine grained ferrite/cementite steels, Scripta Materialia, 54, 7 (2006) pp1385-1389

-2005-
T. Inoue, F. Yin, Y. Kimura and K. Nagai, Distributions of Strain, Microstructure and Hardness in a Bar Steel with Ultafine-Grained Structure through Groove Rolling, J. Japan Inst. Metals, 69, 11(2005) pp943-952 *Japanese

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

T. Inoue and K. Nagai, Numerical Analysis Strain Distribution in Rolled Plates Introduced by Cross Roll Rolling -Study on Creation of Shape and Properties for Shear-Added Rolling Plates II-, JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, 46, 538(2005) pp.1076(50)-1080(54)

M. Zhao,K. Yang, Effects of Nano-sized Microalloyed Carbonitrides and High-density Pinned Dislocations on Sulfide Stress Cracking Resistance of Pipeline Steels, JOURNAL OF MATERIALS RESEARCH, 20, 9 (2005) pp2248-2251

F. Yin, T. Sakaguchi, Q. Tian, A. Sakurai and K. Nagai, The Twinning Microstructure and Damping Behavior in Mn-30Cu (at%) Alloy, MATERIALS TRANSACTIONS, 46, 10 (2005) pp2164-2168

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-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 91, 10 (2005) pp769-776

T. Inoue, S. Iwasaki and K. Nagai, Deformation Property of Cross Rolled Plates Based on Numerical and Experimental Analyses -Study on Creation of Shape and Properties for Shear-Added Rolling Plates I-, JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, 46, 537 (2005) pp67-71

K. Enami and K. Nagai, Evolution of true stress-true strain relationship after local necking by stepwise tensile test, Tetsu-to-Hagane, 91, 9, pp712-718

K.Enami and K.Nagai, The evaluation of plastic deformation limit by circumferentially notched tention test, ISIJ Int'l, 45, 6 (2005) pp930-936

M.-C. Zhao and K. Yang, Strengthening and Improvement of Sulfide Stress Cracking Resistance in Acicular Ferrite Pipeline Steels by Nano-sized Carbonitrides, Scripta Materialia, 52, 9 (2005) 881-886

M.-C. Zhao, T. Hanamura, Q. Hai and K. Yang, Precipitation of Carbonitrides and Their Strengthening upon Non-quench Aging for Micro-alloyed Acicular Ferrite Pipeline Steels, Materials Transactions, 46, 4 (2005) pp784-789

T. Inoue, J. Cho, F. Yin and K. Nagai, Effect of Shear Deformation on Microstructural Evolution of Ni-30Fe Alloy during Hot Deformation, J. Japan Inst. Metals, 69, 4 (2005) pp341-347*Japanese

M.-C. Zhao, T. Hanamura, Q. Hai and K. Yang, Lath boundary thin-film martensite in acicular ferrite untralow carbon pipeline steels, Materials Science and Engineering A- Structural Materials Properties Microstructure and Processing, 395, 1-2 (2005) pp327-332

K. Enami, Evaluation of plastic deformation limit by circumferentially notched tension test, Tetsu-to-Hagane, 91, 2 (2005) pp285-291

N.Tsuchida, E.Baba, K.Nagai, Y.Tomota
Effects of interstitial solute atoms on the very low strain-rate deformations for an IF steel and an ultra-low carbon steel, Acta Materialia, 53 (2005) pp265-270

M.-C. Zhao, T. Hanamura, H. Qiu, K. Nagai, Y.-Y. Shan and K. Yang, Difference in the role of non-quench aging on mechanical properties between acicular ferrite and ferrite-pearlite pipeline steels, ISIJ Int'l, 45, 1 (2005) pp116-120

-2004-
N. Tsuchida, Y. Tomota and K. Nagai, Tensile Deformation Behavior at High Strain Rate for Ultrafine-grained Ferrite-cementite Steels, Tetsu-to-Hagane, 90 ,12 (2004) pp1043-1049
*Japanese

H. Qiu, Y. Kawaguchi, C. Shiga, M. Enoki and T. Kishi, A high-strength and low-yield-ratio carbon steel bar processed by thermo-mechanical rolling, Materials Science and Technology, 20, 9 (2004) pp1158-1160

M. Zhao, Y. Shan, K. Yang, Effect of Aging Treatment on Mechanical Property and H2S Resistant Behavior of AcicularFerrite Pipeline Steels, Acta Metallurgica Sinica, 40, 9 (2004) pp948-954

P. Xu, F. Yin and K. Nagai, The Thickness Gradient of Microstructure and Mechanical Property in an As-cast Thin Steel Slab, Materials Transactions, 45, 7 (2004) pp2456- 2462

P. Xu, F. Yin and K. Nagai, Plastic Anistropy of Strip-Cast Low-Carbon Steels, Materials Transactions, 45, 2 (2004) pp447-456

F. Yin, T. Hanamura, T. Inoue and K. Nagai, Fiber Texture and Substructural Features in the Caliber-Rolled Low-Carbon Steels, Metallurgical and Materials Transactions A -Physical Metallurgy and Materials Science, 35A, 2, pp. 665-677

N. Tsuchida, E.Baba, O. Umezawa, K. Nagai and Y. Tomota, True stress-true strain relations with very low strain rates at room temperature for an austenitic 25Cr-19Ni steel, ISIJ International, Vol.44 (2004), No. 1, pp209-213

-2003-
N. Tsuchida, Y. Tomota and K. Nagai, Tensile Properties Obtrained by Static Tensile Tests in Ultrafine-grained Ferrite-Cementite Steels, Tetsu-to-Hagane, 89, 11 (2003) pp1170-1177

F. Yin, K. Nagai, K. Watanabe and K. Kawahara, The Damping Behavior of Ni Added Mn-Cu Damping Alloys, Materials Transactions, 43, 9 (2003) pp1671-1674

F. Yin, S. Takamori, Y. Ohsawa, K. Nagai and K. Kawahara, The damping behavior of a Ni-50 at%　Ti shape memory alloy, Z. Metallkund, 94, 9 (2003) pp1021-1026

T. Inoue and K. Nagai, Material Processing Development Based on Utilization of Scrap Steel, Journal of JSMS (only Japanese), 52, 9, pp1107-1115

O. Umezawa, K. Hirata and K. Nagai, Influence of Phosphorus Micro-Segregation on Ferrite Structure in Cast Strips of 0.1 mass% C Steel, Material Transactions, 44, 7, pp1266-1270

T. Inoue, S. Ochiaki, M. Hojo and K. Nagai, Fracture Criterion of Single Fiber-Composite under Thermal and Tensile Loadings Based on Energy Release Rate, Journal of JSMS, 52, 7 (2003) pp815-820 *Japanese

F. Yin, T. Hanamura, O. Umezawa and K. Nagai, Phosphorus induced dislocation structure variation in the warm rolled ultrafine grained low carbon steel, Materials Science and Engineering, A354 (2003) pp31-39

N. Igata, K. Nishiyama, K. Ota, F. Yin, W. Wuttig, I.S. Golovin, J.V. Humbeeck, J. Sun Juan, Panel discussion on the application of HDM, Journal of Alloys and Compounds, 355 (2003) pp230-240

-2002-
F. Yin, S. Takamori, Y. Ohsawa, A. Sato and K. Kawahara, The effects of static strain on the damping capacity of damping alloys, Materials Transactions, 43, 3 (2002) pp466-469

N. Tsuchida, Y. Tomota and K. Nagai, Compromise between Environmental Burdens and Performance in Strengthening Steels, J. Advanced Science, 13, 3 (2002) pp269-272

N. Tsuchida, Y. Tomota and K. Nagai, High-Speed Deformation for an Ultrafine-Grained Ferrite-Pearlite Steel, ISIJ International, 42, 12 (2002) pp1594-1596

N. Tsuchida, T. Ono, Y. Tomota and K. Nagai, Effects of temperature, strain rate and ferrite grain size on flow stress for ferrite-pearlite steels, Transaction of the Japan Society of Mechanial Engineers A , 675, 68 (2002) pp 1547-1552 *Japanese

T. Hanamura, A. Yamashita, O. Umezawa, S. Torizuka and K. Nagai, Improvement of Strength-and-Toughness Balance of Recycled Steel through Ultrafinement of Grain Size, J. Advanced Science, 13, 3 (2001) pp179-182

T. Hayashi and K. Nagai, Improvement of strength-ductility balance for low carbon ultrafine-grained steels through strain hardening design, Transaction of the Japan Society of Mechanial Engineers A, 68, 675 (2002) pp1553-1558 *Japanese

H. Shinohara, T. Inoue and K. Nagai, Timesaving numerical method of evaluating strength of wide plate weld joints numerical evaluation of mechanical propertie sof wide plate weld joints (1st Report), Quarterly Journal of the Japan Welding Society, 20, 4 (2002) pp539-545 *Japanese

-2001-
K. Makino, Y. Igarashi, T. Inoue, M. Hojo, M. Tanaka, S. Ochiai, Numerical Analysis of Effect of Matrix Modulus on Interfacial Crack Propagation and Its Application to Experimental Evaluation in Push-out Test, Journal of the Adhesion Society of Japan, 37, 7 (2001) pp266-272 *Japanese

M. Hojo, K. Terashima, Y. Igarashi, M. Shida, S. Ochiai, T. Inoue, Y. Sawada and Y. Suzuki, Interfacial Fracture in Model Composites under Static and Fatigue Loadings -Mechanism Consideration Based on Experimental and Analytical Approaches-, Materials Sci. Research Int., 2 (2001) pp189-196

Y. Fuxing, S. Takamori, Y. Ohsawa, A. Sato and K. Kawahara, A MnCuNiFe damping alloy with superior workability and easiness for recycle, Journal of the Japan Institute of Metals (2001) *Japanese

F. Yin, S. Takamori, Y. Ohsawa, A. Sato and K. Kawahara, Characterization of the strain-amplitude and frequency dependent damping capacity in the M2052 alloy, Materials Transactions, 42 (2001)

N.Tsuchida, Y.Tomota, H.Moriya, O.Umezawa and K.Nagai, Application of the Kocks-Mecking Model to Tensile Deformation of an Austenitic 25Cr-19Ni Steel, Acta Materialia, 49/15 (2001) 3029

-2000-
F. Yin, Y. Ohsawa, A. Sato and K. Kawahara, Tetragoanl Distortion Induced {101} Twinning and Structural Modulation of Gamma Mn Phase in a Mn-20Cu Alloy, Zeitscherift Fur Metallkunde, 91 (2000)

N.Tsuchida, Y.Tomota, H.Moriya, O.Umezawa and K.Nagai, A Description of Stress-Strain Curve of a Ti-Fe-O alloy at various Temperatures and Strain Rates based on Thermal Activation Model, ISIJ International, 40 (2000) 84.

N. Tsuchida, Y. Tomota and K. Nagai, Estimation of Co2 Emission during Thermo-mechanical Process and Eco-steel Design of a Mn-Si-C Steel by Microstructural Control, Tetsu-to-Hagane, 86 (2000) 3, 196-202 *Japanese

N.Tsuchida and Y.Tomota, A micromechanic modeling for transformation induced plasticity in steels, Materials Science & Engineering A, 285 (2000) 345 *Japanese


(Others)

-2005-
K. Nagai, Ultrafine-grained steels: Basic researches and attempts for application, Canadian Metallurgical Quarterly, 44, 2 (2005) pp187-194 /p>