Search Results 1-20 of 81

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  • Roles of Solute C and Grain Boundary in Strain Aging Behaviour of Fine-grained Ultra-low Carbon Steel Sheets  [in Japanese]

    Ono Yoshihiko , Funakawa Yoshimasa , Okuda Kaneharu , Seto Kazuhiro , Ebisawa Naoki , Inoue Koji , Nagai Yasuyoshi

    … <p>The roles of solute C and the grain boundary in the strain aging phenomenon of polycrystalline ferritic steel were investigated using Nb-bearing ULC steel sheets with a relatively low solute C content of 1-3 mass ppm and ferrite grain sizes of 9.5 μm and 183 μm at aging temperatures from 70 to 400ºC. …

    Tetsu-to-Hagane 105(4), 452-461, 2019

    J-STAGE 

  • Surface Current Approximation of Magnetization Currents of Magnetic Materials in Axisymmetric Tokamak Devices for the Correction of their Effects on Magnetic Diagnostics

    KOBAYASHI Takayuki , TSUTSUI Hiroaki , MATSUDA Shinzaburo , TSUJI-IIO Shunji

    … <p>Magnetic materials such as ferritic steel are planned to be installed in fusion DEMO reactors to support blankets and in-vessel components with low activation. …

    Plasma and Fusion Research 13(0), 3402097-3402097, 2018

    J-STAGE 

  • Effect of Heat-treatment Conditions on Toughness in Laser Beam Welds of Reduced Activation Ferritic/martensitic Steel F82H  [in Japanese]

    KIYOKU Ryotaro , KATO Taichiro , HIROSE Takanori , TANIKAWA Hiroyasu , MORI Hiroaki

    … The reduced activation ferritic/martensitic steel F82H is adopted as a structural material of the blanket module, which is the device set on the inner wall of fusion reactors. … And performing post weld heat treatment (PWHT) is necessary because F82H is based on 9Cr-1Mo steel. … 710°C∼730°C×1h was adequate in PWHT condition to reduce welds hardness to base metal hardness and to shift DBTT to sufficiently low level. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 36(1), 104-110, 2018

    J-STAGE 

  • High Temperature Fatigue Life Evaluation Using Small Specimen

    NOGAMI Shuhei , HISAKA Chiaki , FUJIWARA Masaharu , WAKAI Eichi , HASEGAWA Akira

    … <p>For developing the high temperature fatigue life evaluation method using small specimen, the effect of specimen size and test environment on the high temperature fatigue life of the reduced activation ferritic/martensitic steel, F82H-IEA, was investigated at 550 <sup>◦</sup>C under the total strain range of 0.5 - 1.2 % using a new high temperature low cycle fatigue testing machine for the small round-bar specimen. …

    Plasma and Fusion Research 12(0), 1405022-1405022, 2017

    J-STAGE 

  • Roles of Solute C and Grain Boundary in Strain Aging Behaviour of Fine-grained Ultra-low Carbon Steel Sheets

    Ono Yoshihiko , Funakawa Yoshimasa , Okuda Kaneharu , Seto Kazuhiro , Ebisawa Naoki , Inoue Koji , Nagai Yasuyoshi

    … <p>The roles of solute C and the grain boundary in the strain aging phenomenon of polycrystalline ferritic steel were investigated using Nb-bearing ULC steel sheets with a relatively low solute C content of 1–3 ppm and ferrite grain sizes of 9.5 <i>µ</i>m and 183 <i>µ</i>m at aging temperatures from 70 to 400°C. …

    ISIJ International 57(7), 1273-1281, 2017

    J-STAGE 

  • Low Stress Creep Deformation in High Chromium Ferritic Heat-resistant Steel Evaluated by Helicoid Spring Creep Test Method  [in Japanese]

    Yamasaki Shigeto , Mitsuhara Masatoshi , Ikeda Ken-ichi , Hata Satoshi , Nakashima Hideharu

    … We measured a creep deformation in Grade T91 steel under low stress condition using a helicoid spring creep test method. … By applying this method, we measured a very low strain rate creep deformation in a short time as there is no need to consider the contribution of the microstructural change to the creep deformation behavior. …

    Tetsu-to-Hagane 100(5), 688-695, 2014

    IR  J-STAGE 

  • Effect of Mn Addition on a Brittle-to-Ductile Transition in Ferritic Steels  [in Japanese]

    Tanaka Masaki , Maeno Keiki , Yoshimura Nobuyuki , Hoshino Manabu , Uemori Ryuji , Ushioda Kohsaku , Higashida Kenji

    … The effect of Mn addition on a brittle-to-ductile transition (BDT) in Ti added ultra-low carbon steels was investigated comparing with the effect of Ni on it. … The effects of Mn on the temperature dependences of 0.2% proof stress, activation volume and effective stress in Ti added ultra-low carbon steels were nearly the same as those of Ni. …

    Tetsu-to-Hagane 100(10), 1267-1273, 2014

    J-STAGE 

  • Hot Deformation Behavior of Fe-2%Si

    HAN Kyu Seok , SONG Tae Jin , DE COOMAN Bruno Charles

    … The hot deformation behavior of a high purity binary ferritic Fe-2 mass% Si alloy, undergoing no phase transformation or precipitation reactions, was investigated by hot torsion tests. … The parameters for the constitutive equation of Fe-2 mass% Si steel were experimentally determined from the stress-strain curves. …

    ISIJ International 53(2), 294-303, 2013-02-15

    J-STAGE  References (44)

  • Corrosion Characteristics of RAFM Steels and Unalloyed Metals in Static Pb-17Li

    KONDO Masatoshi , MUROGA Takeo

    … The corrosion characteristics of reduced activation ferritic martensitic steels, JLF-1 (Fe-9Cr-1.94W-0.09C) and 9Cr-ODS (Fe-9Cr-1.97W-0.14C-0.29Y-0.23Ti), and unalloyed metals of Cr, W and Mo in liquid Pb-17Li were investigated by means of static corrosion tests at 600<sup>◦</sup>C for 500 hours. … The corrosion of the JLF-1 steel was based on the dissolution of Fe and Cr from the steel surfaces in the Pb-17Li. …

    Plasma and Fusion Research 8(0), 3405053-3405053, 2013

    J-STAGE 

  • Manufacture of Vacuum Plasma Spraying Tungsten with Homogenous Texture on Reduced Activation Ferritic Steel at about 873 K

    TOKUNAGA Tomonori , MASUZAKI Suguru , TAKABATAKE Takeshi , KUROKI Nobuyoshi , EZATO Koichiro , SUZUKI Satoshi , AKIBA Masato , WATANABE Hideo , YOSHIDA Naoaki , NAGASAKA Takuya , KASADA Ryuta , KIMURA Akihiko , TOKITANI Masayuki , MITSUHARA Masatoshi , NAKASHIMA Hideharu

    … The key to improving the heat load of vacuum plasma sprayed tungsten coatings on low activation ferritic steel maintained at low temperatures is elimination of stratified low-density layers with many large pores, in which thermal cracks propagate preferentially. …

    Plasma and Fusion Research 8(0), 1405111-1405111, 2013

    J-STAGE 

  • Brittle-to-ductile Transition in Nickel-free Austenitic Stainless Steels with High Nitrogen

    TANAKA Masaki , ONOMOTO Tatsuro , TSUCHIYAMA Toshihiro , HIGASHIDA Kenji

    … The brittle-to-ductile transition (BDT) behaviour in nickel-free austenitic stainless steel with high nitrogen was investigated. … Fall-weight impact tests revealed that Fe–25mass%Cr–1.1mass%N austenitic steel exhibits a sharp BDT behaviour in spite of an fcc alloy. …

    ISIJ International 52(5), 915-921, 2012-05-15

    J-STAGE  References (42)

  • Change in Dislocation Mobility with Ni Content in Ferritic Steels and Its Effect on Brittle-to-Ductile Transition  [in Japanese]

    Maeno Keiki , Tanaka Masaki , Yoshimura Nobuyuki , Shirahata Hiroyuki , Ushioda Kohsaku , Higashida Kenji

    … In order to elucidate the mechanism behind the decrease in the brittle-to-ductile transition (BDT) temperature with the addition of Ni, impact tests and tensile tests were performed at various test temperatures from 130K to 320K with Ni added ultra-low carbon steels. … The dependence of absorbed impact energy on temperature and the Ni content indicates that the BDT temperature was decreased with the increasing Ni content, which suggests that the dislocation mobility at low temperatures was increased with the Ni content. …

    Tetsu-to-Hagane 98(12), 667-674, 2012

    J-STAGE 

  • Brittle-to-Ductile Transition in Nickel-Free Austenitic Stainless Steels with High Nitrogen  [in Japanese]

    Tanaka Masaki , Onomoto Tatsuro , Tsuchiyama Toshihiro , Higashida Kenji

    … The brittle-to-ductile transition (BDT) behaviour in nickel-free austenitic stainless steel with high nitrogen was investigated. … Fall-weight impact tests revealed that Fe-25mass%Cr-1.1mass%N austenitic steel exhibits a sharp BDT behaviour in spite of an fcc alloy. …

    Tetsu-to-Hagane (98), 237-244, 2012

    J-STAGE 

  • Microstructure and Mechanical Properties of JLF-1 and CLAM Steels Exposed to Thermal Aging with Stress

    LI Yanfen , NAGASAKA Takuya , MUROGA Takeo

    … In this work, effects of low levels of stress during aging at 823 and 973 K for 100 h on mechanical properties and microstructures were investigated for JLF-1 and CLAM steels. …

    Plasma and Fusion Research (6), 2405091-2405091, 2011

    J-STAGE 

  • Fatigue Life Assessment Based on Crack Growth Behavior in Reduced Activation Ferritic/Martensitic Steel

    NOGAMI Shuhei , SATO Yuki , HASEGAWA Akira

    Journal of Nuclear Science and Technology 47(5), 457-461, 2010-05-01

    References (17)

  • Effect of Specimen Shape on the Low Cycle Fatigue Life of Reduced Activation Ferritic/Martensitic Steel

    NOGAMI Shuhei , SATO Yuki , TANAKA Atsushi , HASEGAWA Akira , NISHIMURA Arata , TANIGAWA Hiroyasu

    Journal of Nuclear Science and Technology 47(1), 47-52, 2010-01-01

    References (13) Cited by (2)

  • Premature Creep Rupture and Overestimation of Rupture Life in Modified 9Cr-1Mo Steel  [in Japanese]

    Chen R. P. , Ghassemi Armaki H. , Yoshimi Kyosuke , Maruyama Kouichi , Minami Yusuke , Igarashi Masaaki

    … h and longer has been evaluated on the basis of creep rupture data available on modified 9Cr–1Mo (Gr.91) steel. … The steel is strengthened by a tempered martensite lath structure, which degrades by means of strain induced recovery in short-term creep (Region H). … The premature creep rupture always occurs in Gr.91 steel, but the activation energy <i>Q</i><sub>L</sub> … in Region H in the steel. …

    Tetsu-to-Hagane 96(9), 564-571, 2010

    J-STAGE  Cited by (1)

  • 1608 Current Status of Development of Small Specimen Test Technique of Fatigue for Evaluation of 14 MeV Neutron Irradiated Materials  [in Japanese]

    NOGAMI Shuhei , NISHIMURA Arata , HASEGAWA Akira , WAKAI Eichi , TANIGAWA Hiroyasu , MURATA Kinzo

    … The effect of specimen size and specimen shape on the fatigue life of reduced activation ferritic steel, F82H IEA-heat, was investigated to develop the fatigue life evaluation method using small specimen for testing 14 MeV neutron irradiated materials. … The shorter fatigue life at relatively low strain range and slight longer fatigue life at relatively high strain range for the hourglass specimen than the standard specimen were observed. …

    The Proceedings of the Materials and Mechanics Conference 2010(0), 242-243, 2010

    J-STAGE 

  • S0306-4-5 Evaluation of Fatigue Life and Micro Crack Growth Behavior of Nuclear Plant Materials using Miniature Specimen  [in Japanese]

    NOGAMI Shuhei , ITOH Takamoto , TANIGAWA Hiroyasu , WAKAI Eichi , NISHIMURA Arata , MURATA Kinzo , HASEGAWA Akira

    … The effect of specimen size and specimen shape on the low cycle fatigue life and the micro crack growth behavior under low cycle fatigue in the reduced activation ferritic/martensitic steel, F82H, were investigated using a miniature specimen to develop the fatigue life evaluation method using it. …

    The proceedings of the JSME annual meeting 2010.1(0), 51-52, 2010

    J-STAGE 

  • Mechanical Property Change and Effect for Irradiation Hardening due to Post Weld Heat Treatment on Dissimilar Metal Joint with F82H and SUS316L  [in Japanese]

    Hara Noriyoshi , Nogami Shuhei , Nagasaka Takuya , Miyazaki Junpei , Hasegawa Akira , Tanigawa Hiroyasu , Muroga Takeo

    F82HとSUS316Lの電子ビーム異材溶接を行い、溶接後熱処理による機械的特性変化とプロトン照射による照射硬化に及ぼす影響を調べた

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2009f(0), 742-742, 2009

    J-STAGE 

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