UEJI Rintaro

J-GLOBAL         Last updated: Oct 7, 2019 at 20:42
 
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Name
UEJI Rintaro
Affiliation
National Institute for Materials Science
Degree
Master (Engineering)(Osaka University), Doctor (Engineering) (2004.3)(Osaka University)
ORCID ID
0000-0001-6969-3165

Research Areas

 
 

Academic & Professional Experience

 
Apr 2016
 - 
Today
Principal Researcher, Research Center for Structural Materials, National Institute for Materials Science
 
Mar 2013
 - 
Mar 2016
Associate Professor, Joining and Welding Research Institute, Osaka University
 
Apr 2009
 - 
Feb 2013
Associate Professor, Faculty of Engineering, Kagawa University
 
Apr 2007
 - 
Mar 2009
Assistant Professor, Faculty of Engineering, Kagawa University
 
Apr 2004
 - 
Mar 2007
Assistant, Faculty of Engineering, Kagawa University
 

Education

 
Apr 2001
 - 
Mar 2004
Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University
 
Apr 1999
 - 
Mar 2001
Department of Materials Science, Graduate School of Engineering, Osaka University
 
Apr 1994
 - 
Mar 1999
B.(Eng.), Faculty of Engineering, Osaka University
 

Committee Memberships

 
2007
   
 
The Iro and Steel Institute of Japan  中国四国支部 評議員
 

Awards & Honors

 
2007
Award for best reserch presentation, Japan Welding Society
 
2006
第56回金属組織写真賞(B部門奨励賞)
 
Mar 2004
Silver Medal for poster presentation, The Internatinal Symposium on Ultrafine Grained Materials, TMS
 
2004
Silver Medal for poster presentation, The International Symposium on Ultrafine Grained Materials, TMS, US(2004)
 

Published Papers

 
Rintaro Ueji, Tadanobu Inoue
Materials Letters   256    Dec 2019
© 2019 Elsevier B.V. Effect of external stress on pearlite transformation in a high-carbon steel was examined in terms of the measurement of volume change during isothermal holding. Two dimensional measurement of the steel holding at various tempe...
Rintaro Ueji, Tadanobu Inoue
Materials Science and Engineering A   764    Sep 2019
© 2019 Elsevier B.V. The thermomechanical interactions between two different regions with different carbon contents during cooling from the austenite single phase condition was studied with a sandwich-like clad sheet. The clad steel with a layered...
Rintaro Ueji, Tadanobu Inoue
Steel Research International   90    May 2019
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Tensile properties of steel sheet with the sandwich mesostructure are studied to clarify the influence of interface morphology. The 0.05%C and the 0.45%C steel flat plates with the same volume fr...
Tadanobu Inoue, Rintaro Ueji, Yuuji Kimura
Materials Letters   240 172-175   Apr 2019
© 2019 Elsevier B.V. A novel rolling process characterized by multi-pass bi-axial reduction was proposed. An 800 MPa class low-carbon steel bar with ultrafine elongated-grain structures was fabricated using bi-axial rolling at a warm working tempe...
Nobuhiro Tsuji, Reza Gholizadeh, Rintaro Ueji, Naoya Kamikawa, Lijia Zhao, Yanzhong Tian, Yu Bai, Akinobu Shibata
Materials Transactions   60 1518-1532   Jan 2019
© 2019 The Japan Institute of Metals and Materials Severe plastic deformation (SPD) have had a revolutionary impact in fabricating ultrafine grained (UFG) or nanostructured metallic materials with bulky dimensions. It is, however, difficult to und...
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
Welding International   32 338-344   May 2018
© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. The effect of additional cooling by splaying liquid CO2 during friction stir welding (FSW) on the microstructure change in the stir zone of Fe–24 wt%Ni–0.1%C alloy steel was i...
C. Watanabe, R. Monzen, R. Ueji, H. Miura
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   48 5368-5375   Nov 2017
© 2017, The Minerals, Metals & Materials Society and ASM International. Strain-rate and temperature dependences of deformation behavior of ultrafine-grained (UFGed) AZ61Mg alloy were examined. For this purpose, AZ61Mg alloy specimens were subjec...
Rintaro Ueji, Hai Qiu, Tadanobu Inoue
Materials Transactions   58 1487-1492   Jan 2017
©2017 The Japan Institute of Metals and Materials. Tensile properties at various deformation speeds up to ~1500 mm/sec of low-carbon steel with elongated ultrafine grains were examined, focusing on both strength and ductility. Fine-grained samples...
UEJI Rintaro, INOUE Tadanobu
Journal of the Japan Society for Technology of Plasticity   58(675) 323-329   2017   [Refereed]
The tensile properties of a Japanese-sword-type steel sheet, which has a sandwich-type layered structure consisting of low and medium carbon steels, were clarified. The hard and soft center sheets were prepared by stacking 0.05%C steel as the soft...
Nozomu Adachi, Ningning Wu, Yoshikazu Todaka, Hideyuki Sato, Rintaro Ueji
Materials Letters   185 109-111   Dec 2016
© 2016 Elsevier B.V. Stabilization behaviors of high-pressure ε-phase by high-pressure torsion process in the Fe-Mn alloys having different stacking fault energies (i.e., γ-phase stabilities) were investigated. Stabilization of high-pressure ε-pha...
Yoshiaki Morisada, Koki Tamashiro, Masayoshi Kamai, Rintaro Ueji, Hidetoshi Fujii
Welding International   30 596-601   Aug 2016
© 2016 Informa UK Limited, trading as Taylor & Francis Group. Abstract: Much attention has been paid to FSW as a useful joining process that provides superior characteristics compared with conventional fusion welding. However, the FSW equipment ...
Nan Xu, Rintaro Ueji, Hidetoshi Fujii
Journal of Materials Processing Technology   232 90-99   Jun 2016
© 2016 Elsevier B.V. All rights reserved. To comprehensively understand the microstructural evolution during friction stir welding (FSW), the plastic deformation stage and the post-annealing stage of the FSW were separated by a stop action techniq...
Murshid Imam, Rintaro Ueji, Hidetoshi Fujii
Journal of Materials Processing Technology   230 62-71   Apr 2016
© 2015 Elsevier B.V. Motivated by the morphological change in the fine ferrite grains and cementite particles from post-annealing, and its consequences of the loss of strength and ductility, friction stir welds of medium carbon steel were obtained...
Abdel Monem El-Batahgy, Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
Materials Science and Engineering A   651 904-913   Jan 2016
© 2015. Motivated by the considerable loss of the mechanical properties in the case of arc welding due to different precautions including adding under-matching filler metal, the feasibility of friction stir welding for joining ultrahigh mechanical...
Hiroki Fujimoto, Hideki Ueda, Rintaro Ueji, Hidetoshi Fujii
ISIJ International   56 1276-1284   Jan 2016
© 2016 ISIJ. This paper discusses the effect of shot blast processing on the fatigue strength of resistance spot welded joints of 980 MPa steel sheets and the mechanism by which the fatigue strength is improved. The fatigue limit load of shot blas...
Hiroki Fujimoto, Hideki Ueda, Takashi Imamura, Rintaro Ueji, Hidetoshi Fujii
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society   34 93-101   Jan 2016
The static and fatigue strength of crush durable structural adhesive bonded lap joints of steel sheets for automobiles were evaluated by tensile shear tests. The steel sheets used in this study were uncoated and galvannealed (GA) with tensile stre...
T. Miura, R. Ueji, H. Fujii, T. Murakami, T. Kobashi
Science and Technology of Welding and Joining   21 281-286   Jan 2016
© 2016 Institute of Materials, Minerals and Mining. To clarify the possibility to maintain the retained austenite even in the joint area of the low-alloyed transformation induced plasticity-aided steel sheets, friction stir welding (FSW) was inves...
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii, Hisanao Komine, Jun Yanagimoto
Materials and Design   90 915-921   Jan 2016
© 2015 Elsevier Ltd. Friction stir welding (FSW) was applied to a low carbon alloyed steel in order to stabilize the austenite phase which can effectively maintain a preferable toughness. A Cr-Mo steel sheet (0.20wt.%C-1.07%Cr-0.16%Mo-0.24%Si-0.61...
Sungook Yoon, Rintaro Ueji, Hidetoshi Fujii
Materials and Design   88 1269-1276   Dec 2015
© 2015 Elsevier Ltd. Ti-6Al-4V alloy plates with three types of initial microstructures, which have different densities of the high angle boundaries, were joined by friction stir welding (FSW), and the microstructure evolution in the stir zone by ...
Sungook Yoon, Rintaro Ueji, Hidetoshi Fujii
Journal of Materials Processing Technology   229 390-397   Sep 2015
© 2015 Elsevier B.V. Ti-6Al-4V alloy plates with a thickness of 5 mm were successfully joined by friction stir welding (FSW) at a significantly lower than the β-transus temperature, and the microstructure and texture evolution in the stir zone (SZ...
Sungook Yoon, Rintaro Ueji, Hidetoshi Fujii
Materials Characterization   106 352-358   Aug 2015
© 2015 Elsevier Inc. All rights reserved. Ti-6Al-4V alloy plates with a thickness of 2 mm were successfully friction stir welded (FSW) and the microstructure change in the weld was clarified. The FSW was conducted at the tool rotation rates rangin...
Juan Chen, Rintaro Ueji, Hidetoshi Fujii
Materials and Design   76 181-189   Jul 2015
© 2015 Elsevier Ltd. Double-sided friction stir welding (DFSW) with the combined use of convex and concave tools (concave-DFSW) was studied for the joining of a magnesium alloy. The sound joints made by the concave-DFSW were possible under the app...
Murshid Imam, Rintaro Ueji, Hidetoshi Fujii
Materials Science and Engineering A   636 24-34   Jun 2015
© 2015 Elsevier B.V. Critical control of the welding conditions produced a fine ferrite-martensite duplex structure with the martensite volume fraction of around 33% in friction stir welding (FSW) of medium carbon (0.45. wt% C) low alloy steel she...
Hiroki Fujimoto, Hideki Ueda, Eisuke Nakayama, Rintaro Ueji, Hidetoshi Fujii
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society   33 253-261   Jan 2015
Hot stamping spot welding tailored blank (TB) technology is a process to produce spot welded automotive body parts by the following process: Spot welding steel sheets in lap configuration Hot stamping (Heating to about 900°C Quenching and forming ...
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society   33 358-364   Jan 2015
The effect of additional cooling by splaying liquid CO2 during friction stir welding (FSW) on the microstructure change in the stir zone of Fe - 24 wt.%Ni - 0.1 %C alloy steel was investigated. When the cooling rate after the stirring increased by...
Hiroki Fujimoto, Masanori Yasuyama, Hideki Ueda, Rintaro Ueji, Hidetoshi Fujii
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society   33 144-152   Jan 2015
Hot stamping spot welding tailored blank technology is a process to produce spot welded automotive body parts by the following process: Spot welding steel sheets in lap configuration → Hot stamping (Heating to about 900 C → Quenching and forming i...
Y. Morisada, K. Tamashiro, M. Kamai, R. Ueji, H. Fujii
Science and Technology of Welding and Joining   20 249-253   Jan 2015
© 2015 Institute of Materials, Minerals and Mining. Friction stir welding (FSW) is widely used in various industrial fields. However, high stiffness is required for FSW equipment which has to withstand high applied load and tool torque and therefo...
N. Xu, R. Ueji, H. Fujii
Science and Technology of Welding and Joining   20 91-99   Jan 2015
© 2015, Institute of Materials, Minerals and Mining. 70/30 (Cu/Zn) brass plates with a 2 mm thickness were jointed by repeated rapid cooling friction stir welding. The joints from each FSW cycle showed the typical construction of a microstructure ...
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
Journal of Materials Processing Technology   216 216-222   Jan 2015
© 2014 Elsevier B.V. All rights reserved. The austenite in the stir zone (SZ) of Fe-24wt%Ni-0.1%C alloy fabricated by friction stir welding (FSW) was successfully stabilized. The volume fraction of austenite increases with decreasing rotation spee...
Ying Zou, Rintaro Ueji, Hidetoshi Fujii
Materials Science and Engineering A   620 140-148   Dec 2014
© 2014 Elsevier B.V. Duplex stainless steel and ferrite steel were welded by the advanced active-TIG (AA-TIG) welding method at different oxygen contents in the shielding gas. A double-shielded gas flow system was used and the oxygen content in th...
Nan Xu, Rintaro Ueji, Hidetoshi Fujii
Materials Science and Engineering A   610 132-138   Jul 2014
The effect of rapid cooling on the microstructure, texture and mechanical properties of friction stir welded 70/30 brass was investigated. Liquid CO2 was used as the cooling medium during the process. Without the rapid cooling, the welded joint sh...
P. Xue, Y. Komizo, R. Ueji, H. Fujii
Materials Science and Engineering A   606 322-329   Jun 2014
Submerged arc weld metal of a high strength low alloy steel was subjected to friction stir welding (FSW) at a higher rotation rate of 400. rpm (FSW-a) and a lower rotation rate of 125. rpm (FSW-b), respectively. The microstructures and mechanical ...
Ying Zou, Rintaro Ueji, Hidetoshi Fujii
Materials Characterization   91 42-49   May 2014
The double-shielded advanced A-TIG (AA-TIG) welding method was adopted in this study for the welding of the SUS329J4L duplex stainless steel with the shielding gases of different oxygen content levels. The oxygen content in the shielding gas was c...
Morisada Yoshiaki, Tamashiro Koki, Kamai Masayoshi, Ueji Rintaro, Fujii Hidetoshi
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society   32 52-56   Jan 2014
Much attention has been paid to FSW as a useful joining process that provides superior characteristics compared with conventional fusion welding. However, the FSW equipment must have a high stiffness due to the applied load and the tool torque, wh...
Kazuhiro Ito, Tatsuya Okuda, Rintaro Ueji, Hidetoshi Fujii, Chiaki Shiga
Materials and Design   61 275-280   Jan 2014
To improve the fatigue resistance of tungsten inert gas (TIG)-welded SS400 steel plates, friction stir processing (FSP) was performed on TIG weld beads. Although the tensile properties of the TIG-welded steel plates with FSP were similar to those ...
Ryuichiro Ebara, Yuya Fukushima, Shintaro Nakagawa, Rintaro Ueji
Advanced Materials Research   891-892 674-678   Jan 2014
In this paper the emphasis is focused upon nitriding effect on corrosion fatigue strength of Cr-Mo low alloy steel in 1% HCl aqueous solution. Corrosion fatigue strength enhancement of Cr-Mo low alloy steel by nitriding is discussed on the basis o...
Nan Xu, Rintaro Ueji, Yoshiaki Morisada, Hidetoshi Fujii
Materials and Design   56 20-25   Jan 2014
A notable effect of the retained heat after the fiction stir welding (FSW) of Cu was studied by the application of additional liquid CO2 cooling. The adjustment of the welding parameters made it possible to conduct the FSW processes, but the cooli...
Hidetoshi Fujii, Rintaro Ueji, Yoshiaki Morisada, Hiroyasu Tanigawa
Scripta Materialia   70 39-42   Jan 2014
Steel plates were friction-stir-welded together under conditions in which samples were first heated above the lower critical temperature of the alloy and subsequently cooled at approximately 100 K s -1 . This method produced joints with an excelle...
Noriyuki Tsuchida, Yuko Yamaguchi, Yoshiki Morimoto, Tomoyuki Tonan, Yoshinori Takagi, Rintaro Ueji
ISIJ International   53 1881-1887   Nov 2013
Effects of temperature and strain rate on tensile properties in metastable austenitic stainless steel SUS301L were studied in order to clarify the conditions of stress-induced martensitic transformation behavior for the maximum uniform elongation ...
Noriyuki Tsuchida, Saya Kawabata, Kenzo Fukaura, Rintaro Ueji
Journal of Alloys and Compounds   577    Nov 2013
The effect of the Ni equivalent (Nieq.) on the transformation-induced plasticity (TRIP) effect in metastable austenitic steels was investigated to clarify the conditions of stress-induced martensitic transformation behavior for maximum uniform elo...
Yoshihiko Hangai, Kousuke Zushida, Hidetoshi Fujii, Rintaro Ueji, Osamu Kuwazuru, Nobuhiro Yoshikawa
Materials Science and Engineering A   585 468-474   Nov 2013
Open-celled metal foams have received considerable attention in various fields and are expected to be used as engineering materials where heat exchange, sound absorption and filtration are required. In this study, Cu foam specimens with NaCl volum...
Juan Chen, Hidetoshi Fujii, Yufeng Sun, Yoshiaki Morisada, Rintaro Ueji
Materials Science and Engineering A   580 83-91   Sep 2013
The improvement in mechanical properties of the AZ31B Mg joint was achieved through texture control by the double-sided friction stir welding technique. The co-direction and counter-direction rotations of the upper and lower tools were adopted for...
Rintaro Ueji, Yoshinori Takagi, Noriyuki Tsuchida, Kazunari Shinagawa, Yasuhiro Tanaka, Takashi Mizuguchi
Materials Science and Engineering A   576 14-20   Aug 2013
© 2013 Elsevier B.V. The dependence of the ε martensite transformation on the crystallographic orientation during a tensile test of metastable high-manganese austenitic steel, Fe–30 mass% Mn, with a polycrystalline microstructure was studied. The ...
Y. Morisada, H. Fujii, R. Nishimoto, T. Miyazawa, Y. Iwamoto, R. Ueji
Science and Technology of Welding and Joining   18 287-292   May 2013
Structural steel plates with tensile strength of 490 MPa and 6 mm in thickness were successfully joined with microstructural control by single sided one-pass butt friction stir welding (FSW). The microstructure in the stir zone (SZ) could be chang...
Rajib Saha, Rintaro Ueji, Nobuhiro Tsuji
Scripta Materialia   68 813-816   May 2013
For the first time, a fully recrystallized nanostructure with a mean grain size of 400 nm can be fabricated without severe plastic deformation in a high-Mn austenitic steel. We report and discuss the evolution of the nanostructure and mechanical p...
Rajib Saha, Rintaro Ueji, Nobuhiro Tsuji
Materials Science Forum   753 518-521   Apr 2013
A study has been carried out on the evolution of microstructure, grain boundary character and mechanical properties in a Twinning Induced Plasticity steel heavily cold rolled and subsequently annealed.The cold rolled mcrostructures showed fine lam...
S. A. Khodir, Y. Morisada, R. Ueji, H. Fujii
Materials Science and Engineering A   558 572-578   Dec 2012
Stir-in-plate welds were produced on 2. mm thick plates of SK4 high carbon steel alloy (0.95% C) using a load controlled friction stir welding (FSW) machine. The welding was carried out at a constant welding speed of 100. mm/min and different rota...
Rintaro Ueji, Daisuke Kondo, Yoshinori Takagi, Takashi Mizuguchi, Yasuhiro Tanaka, Kazunari Shinagawa
Journal of Materials Science   47 7946-7953   Nov 2012
The influence of the microstructure on the tensile properties and fracture behavior of Hadfield steel at high strain rate were studied. Hadfield steel samples with different mean grain sizes and carbon phases were prepared by rolling at medium tem...
Hideyuki Sato, Yoshikazu Todaka, Nobuhiro Tochigi, Rintaro Ueji, Minoru Umemoto
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   98 541-547   Oct 2012
The influences of strain and compressive stress on the α to ε phase transformation behavior in α-Mn steels were investigated by means of high-pressure torsion (HPT). In addition, the influence of Mn addition, i.e. 10, 12, 15 mass%Mn, which increas...
Ghasem Dini, Rintaro Ueji
Steel Research International   83 374-378   Apr 2012
The effects of grain size and grain orientation on substructure in Fe-31Mn-3Al-3Si TWIP steel at a true strain of 0.06 were investigated. The results of the TEM observations indicated that where the grain size was 18.4 μm, the dislocations structu...

Misc

 
Nobuhiro Tsuji, Rintaro Ueji, Yoshinori Ito, Hyoung Wook Kim
TMS Annual Meeting   2006 81-88   May 2006
One of the issues of ultrafine grained metallic materials is limited uniform elongation contrary to high strength. The issue is discussed on the basis of the experimental evidences. The limited uniform elongation is due to early plastic instabilit...
Sustainable Progress in Hot-Strip Rolling Process-Metallurgy
Ferrum   11(12) 784-790   2006
Friction stir welding of ultrafine grained IF and carbon steels
Transactions of JWRI   35(1) 47-52   2006
Hidetoshi Fujii, Ling Cui, Nobuhiro Tsuji, Rintaro Ueji, Kazuhiro Nakata, Kiyoshi Nogi
Proceedings of the International Offshore and Polar Engineering Conference   2005 22-26   Dec 2005
The friction stir welding (FSW) of various kinds of ultrafine grained materials, such as steel, aluminum and copper, was performed. Ultrafine grained IF (interstitial free) steel, pure aluminum (A 1050) and oxygen-free copper were produced by the ...
Crystallographic charactors in low-carbon steel martensite
Materia   44(12) 982   2005

Conference Activities & Talks

 
UEJI Rintaro, INOUE Tadanobu
Materials Science & Technology 19   29 Sep 2019   The Association for Iron &Steel Technology (AIST)
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
Friction Stir Welding and Processing VIII   1 Jan 2016   
© 2016 by The Minerals, Metals & Materials Society. The phase transformation in steel during friction stir welding (FSW) was studied using the Fe-24wt%Ni-0.1%C alloy. When the FSW condition was adapted in order that the maximum temperature was s...
Takuya Miura, Rintaro Ueji, Hidetoshi Fujii
TMS Annual Meeting   1 Jan 2015   
The phase transformation in steel during friction stir welding (FSW) was studied using the Fe-24wt%Ni-0.1%C alloy. When the FSW condition was adapted in order that the maximum temperature was sufficiently reached for austenitization, the volume fr...
R. Ueji, N. Tsuchida, K. Harada, K. Takaki, H. Fujii
IOP Conference Series: Materials Science and Engineering   1 Jan 2015   Department of Wind Energy Technical University of Denmark
© Published under licence by IOP Publishing Ltd. The grain size effect on the deformation twinning in a high manganese austenitic steel which is so-called TWIP (twining induced plastic deformation) steel was studied in order to understand how to c...
Takuya Nishimura, Masatoshi Aramaki, Shinji Munetoh, Rintaro Ueji, Osamu Furukimi
Proceedings - European Conference on Heat Treatment and 21st IFHTSE Congress   1 Jan 2014   
The effect of tensile strain rate on the formation of voids by using the industrial pure iron (0.0028% C,-0.16% Mn,-0.001% Si) with few precipitates was studied. The tensile tests were performed under the initial strain rate of 10-3,101 and 103 s-...
Strain rate dependence of hydrogen embrittlement of low carbon steel martensite
R.Ueji, Y.Nagaki, A.Otsuka, Y.Todaka
The 5th International Symposium on Designing, Processing and Properties of Advanced Engineering Materials (ISAEM-2012)   5 Nov 2012   Japan Society for the Promotion of Science
Strengthening of steels can be achieved by several kinds of microstructural controls. Lath martensite is the most important microstructure as a fundamental structure of high strength steels. On the other hand, hydrogen (H) embrittlement becomes mo...
Ductility of Hadfield steel at high speed or warm temperature deformation
UEJI Rintaro
21 Sep 2012   
Ductility at high speed deformation of warm-rolled and annealed Hadfield steel
R.Ueji, T.Yoshisako, Y.Todaka, K.Shinagawa, T.Mizuguchi, Y.Tanaka
17 Sep 2012   
Large ductility of high-Mn austenite and the application as a component phase in multi phase steel
R.Ueji, T.Okitsu, Y.Tanaka, T.Mizuguchi, K.Shinagawa
20 Sep 2011   
Microstructure evolution in dissimilar metal joint interface obtained by friction welding of cast iron and carbon steel
7 Sep 2011   
Similarity in the crystallographic aspects of the grain size effects on deformation twin and deformation induced ε-martensite
R. Ueji, Y. Takagi, Y. Todaka, T. Mizuguchi. Y. Tanaka, K. Shinagawa
The 1st International Conference on High Manganese Steels HMnS2011   15 May 2011   Research Institute of Iron and Steel Technology, Yonsei University
The similarity between the crystallographic feature of the grain size effect on the twinning and that on the deformation induced -martensite was found in the high Mn steels. The grain size effect on the deformation twin were studied with Fe-31mas...
Effect of grain size and grain orientation on dislocations structure in tensile strained TWIP steel during initial stages of deformation
G. Dini, R. Ueji
The 1st International Conference on High Manganese Steels (HMnS2011)   15 May 2011   Research Institute of Iron and Steel Technology, Yonsei University
The effects of grain size and grain orientation on substructure in Fe–31Mn–3Al–3Si TWIP
steel at a true strain of 0.06 were investigated. The results of the TEM observations
indicated that where the grain size was 18.4 mm, the dislocations structu...
High speed deformation of high Mn - high C austenitic steels with various mean grain sizes
R.Ueji, D.Kondo, T.Mizuguchi, Y.Tanaka, K.Shinagawa
25 Mar 2011   
High-Speed Deformation of 15%Mn Steel With Fine Lamellar Structure Consisting of Ferrite and Austenite Phases
Rintaro Ueji, Yoshitaka Okitsu, Takashi Nakamura, Yoshinori Takagi, Yasuhiro Tanaka
The Iron & Steel Technology Conference and Exhibition (AISTech 2010)   3 May 2010   Association for Iron & Steel Technology, US
Tensile properties of medium Mn (15Mn-3Al-3Si) steel with fine lamellar structure consisting of austenite and ferrite were examined, including the high speed deformation at a strain rate of 1000/s. The worm temperature rolling during cooling from ...
R. Ueji, Y. Okitsu, T. Nakamura, Y. Takagi, Y. Tanaka
Journal of Physics: Conference Series   1 Jan 2010   
New steel with fine lamellar structure consisting of austenite and ferrite was developed. 15mass%Mn-3%Al-3%Si steel sheet was used in this study. First of all, the effect of the cooling rate on the microstructure was examined. The cooling at the s...
Y. Tanaka, M. Kondo, N. Miyazaki, R. Ueji
Journal of Physics: Conference Series   1 Jan 2010   
Plastic deformation behavior of pure titanium has been investigated using a tensile test at a various range of strain rates. Flow stress curves reveal that the work hardening behavior depends on the strain rates. The higher strain rates, the more ...
K. Tanaka, S. Fujio, H. Inui, R. Ueji, N. Sumida
Journal of Physics: Conference Series   1 Jan 2009   
The convergent-beam electron diffraction (CBED) method we proposed recently for enantiomorph identification has successfully been applied to some amino acid crystals such as glutamic acid and threonin. Enantiomorph identification (either left-hand...
Y. Morimoto, S. Okamoto, K. Fukaura, N. Tsuchida, R. Ueji
9th International Conference on Technology of Plasticity, ICTP 2008   1 Jan 2008   
In order to investigate the role of stress-induced martensitic transformation in TRIP steels, static tensile deformation behaviours of JIS-SUS304 and JIS-SUS301L steels were compared. In the static tensile tests, tensile strength of the SUS301L st...
Nobuhiro Tsuji, Rintaro Ueji, Yoshinori Ito, Hyoung Wook Kim
TMS Annual Meeting   18 May 2006   
One of the issues of ultrafine grained metallic materials is limited uniform elongation contrary to high strength. The issue is discussed on the basis of the experimental evidences. The limited uniform elongation is due to early plastic instabilit...
Microstructures of C-Si-Mn-Cr-Mo steels cooled at various rates after high-temperature austenitization
9th Ultra-Steel Workshop, Japan(Tsukuba), NIIMS   2005   
R. Ueji, N. Tsuji, Y. Minamino, Y. Koizumi
Ultrafine Grained Materials III   14 Jul 2004   
A new thermomechanical processing named the martensite process which can easily fabricate the ultrafine grained steels without severe plastic deformation was developed. In this process, martensite is used as the starting structure. The martensite ...
Fabrication of Ultrafine Grained Steels without Severe or Heavy Plastic Deformation
Transactions of Materials Resserch Society, Japan   2004   
Misorientation change during annealing of Al heavily deformed by accumulative roll-bonding (ARB)
Transactions of Materials Resserch Society, Japan   2004   
Effect of reduction and carbon content on the mechanical properties of the multiphased ultrafine grain-steels fabricated by martensite cold-rolling and annealing
Proc. of the 7th STX-21 workshop, NIMS (National Institute of Materials Science), Tsukuba, Japan.   2003   
R. Ueji, N. Tsuji, Y. Minamino, Y. Koizumi, Y. Saito
TMS Annual Meeting   1 Jan 2002   
The authors have developed a simple thermomechanical processing without intense straining to obtain ultrafine-grained bulk steel with both high strength and adequate ductility. Plain low carbon steels (JIS-SS400 and SM490) were austenitized and wa...
Orientation analysis of ultrafine grained bulk materials produced by accumulative roll-bonding (ARB) process by use of EBSD technique
Proc. of microscopy & microanalysis 2002: Microscopy & Microanalysis, vol.8, suppl.2, Cambridge university press, CD-R version, Cambridge, UK   2002   
Mechanical properties of ultrafine grained ferritic steels produced by accumulative roll-bonding (ARB) process
Proc. of the 5th STX-21 workshop, NRIM (National Research Institute of Materials), Tsukuba, Japan.   2001   
A novel process to obtain nanostructured low-carbon bulk steel with high strength
Proc. of the 22nd Risø Int. Symp. on Materials Science “Recrystallization Fundamental Aspects and Relations to Deformation Microstructure”, , Risø National Laboratory, Roskilde, Denmark   2001   
Formation process of ultrafine grains during intense straining of low-carbon steels
Proc. of the 5th STX-21 workshop, NRIM (National Research Institute of Materials), Tsukuba, Japan.   2001   
hermomechanical processing starting from martensite structure -A novel way to obtain ultrafine grained high strength steels-
Proc. of Int. Symp. on Ultrafine Grained Steels (ISUGS-2001), ISIJ (The Iron and Steel Institute of Japan), Hukuoka, Japan   2001   

Research Grants & Projects

 
Strengthening of TWIP (Twwinig Induced Plasticity) steels by grain-refinements
Grant-in-Aid for Scientific Research
Project Year: 2007 - 2009
Development of new high strength streel (MD steel) with an apprication of Bainite transformation
Project Year: 2006