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Chikada, Nobuyoshi*; Hayashi, Shigenari*; Ukai, Shigeharu*; Otsuka, Satoshi; Kaito, Takeji
no journal, ,
no abstracts in English
reverse phase transformation behavior of 9Cr-ODS ferritic steelYamamoto, Masahiro*; Hayashi, Shigenari*; Ukai, Shigeharu*; Otsuka, Satoshi; Kaito, Takeji
no journal, ,
no abstracts in English
Endo, Masaki*; Sakaguchi, Norihito*; Kinoshita, Hiroshi*; Watanabe, Seiichi*; Yamashita, Shinichiro; Yano, Yasuhide; Kawai, Masayoshi*
no journal, ,
no abstracts in English
Onuki, Shun*; Abe, Hiroshi; Matsumura, Yoshihito*
no journal, ,
no abstracts in English
-FeTsuru, Tomohito; Suzuki, Chikashi; Kaji, Yoshiyuki; Tsukada, Takashi
no journal, ,
The segregation and clustering of several impurity atoms in -Fe were systematically investigated using first principle calculations with the classical analytical models. The interaction characteristics of Fe and each impurity element can be estimated from the total energy via DFT calculations. Specific clusters that included up to 6 impurity atoms were selected and the free energy changes for clustering were evaluated in verifying the presented evaluation method. The results revealed that interaction parameters of copper and manganese impurities embedded in the -Fe cause a positive value which means that these impurities are poorly soluble in the matrix. Specific confirmation was made that these tendencies were in excellent agreement with the direct calculations of changes in enthalpy for clustering and recent atom probe observations.
Nogiwa, Kimihiro; Nishimura, Akihiko; Inoue, Masaki; Otsuka, Satoshi; Yokoyama, Atsushi; Okubo, Tadakatsu*; Hono, Kazuhiro*
no journal, ,
Japan Atomic Energy Agency (JAEA) has developed 9Cr-ODS martensitic steel and has succeeded in manufacturing thin-walled tubes that overcome highly anisotropic properties. Previous studies revealed that the 9Cr-ODS steel has a dual phase structure consisting of residual-ferrite and martensite. Improvement in creep strength is apparently caused by the retention of the phase, in which ultrafine oxide particles are dispersed. In this study, we have investigated the nanometer-scale microstructure of a dual phase 9Cr-ODS steel by the 3D atom probe operated with femtosecond laser pulses and compared the dispersion state of oxide particles in residual-ferrite and martensite phases.
iron studied by a newly developed optimization algorithmAbe, Yosuke; Jitsukawa, Shiro
no journal, ,
A combination of simulated annealing with Langevin molecular dynamics and basin-hopping with occasional jumping (BHOJ) technique has been applied to global optimization and used to determine systematically the most stable configurations of self-interstitial atom (SIA) clusters with and without carbon (C) impurity in -iron. With the obtained putative lowest energy structures, the binding energies with and without C atoms as a function of cluster size were estimated. The preliminary simulations performed by means of rate theory model taking into account the obtained stability of SIA clusters with and without C impurity are discussed in detail.
Yamaguchi, Masatake
no journal, ,
no abstracts in English
Kita, Kenichiro; Narisawa, Masaki*; Mabuchi, Hiroshi*; Sugimoto, Masaki; Yoshikawa, Masahito
no journal, ,
no abstracts in English
Suzuki, Hiroshi; Imafuku, Muneyuki*; Saida, Junji*; Setyawan, A. D.*; Kato, Hidemi*
no journal, ,
Deformation behavior on a Zr
Al
Ni
Cu
bulk metallic glass containing 10 vol%ZrC particles were measured using neutron diffraction. Elastic deformation behavior under uniaxial tensile loading can be predicted by the Self-Consistent model. Higher strength in compressive deformation in this sample is originated from the thermal tensile residual stresses, and from the phase stresses transferred to the metallic glass matrix which are 5% less than the applied stresses under uniaxial loading.