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Journal Articles

Change in mechanical properties by high-cycle loading up to Gigacycle for 316L stainless steel

Naoe, Takashi; Harjo, S.; Kawasaki, Takuro; Xiong, Z.*; Futakawa, Masatoshi

JPS Conference Proceedings (Internet), 28, p.061009_1 - 061009_6, 2020/02

At the J-PARC, a mercury target vessel made of 316L SS suffers proton and neutron radiation environment. The target vessel also suffers cyclic impact stress caused by the proton beam-induced pressure waves. The vessel suffers higher than 4.5$$times$$10$$^8$$ cyclic loading during the expected service life of 5000 h. We have investigated fatigue strength 316L SS up to gigacycle in the previous studies. The cyclic hardening and softening behavior were observed. In this study, to evaluate the cyclic hardening/softening behavior, the dislocation densities of specimens were measured using the neutron diffraction method at the MLF BL-19. The result showed that the dislocation density of a 316L SS was increased with increasing the number of loading cycles. By contrast, in the case of cold-rolled 316L SS, annihilation and re-accumulation of dislocation by cyclic loading were observed. In the workshop, result of neutron diffraction measurement will be introduced with the progress of fatigue test.

Journal Articles

${it In-situ}$ observation of dislocation evolution in ferritic and austenitic stainless steels under tensile deformation by using neutron diffraction

Sato, Shigeo*; Kuroda, Asumi*; Sato, Kozue*; Kumagai, Masayoshi*; Harjo, S.; Tomota, Yo*; Saito, Yoichi*; Todoroki, Hidekazu*; Onuki, Yusuke*; Suzuki, Shigeru*

Tetsu To Hagane, 104(4), p.201 - 207, 2018/00

 Times Cited Count:3 Percentile:58.46(Metallurgy & Metallurgical Engineering)

Journal Articles

Changes of dislocation density and dislocation arrangement during tensile deformation in lath martensitic steels

Harjo, S.; Kawasaki, Takuro; Morooka, Satoshi

Advanced Experimental Mechanics, 2, p.112 - 117, 2017/10

Journal Articles

Composite behavior of lath martensite steels induced by plastic strain, a new paradigm for the elastic-plastic response of martensitic steels

Ung$'a$r, T.*; Harjo, S.; Kawasaki, Takuro; Tomota, Yo*; Rib$'a$rik, G.*; Shi, Z.*

Metallurgical and Materials Transactions A, 48(1), p.159 - 167, 2017/01

AA2016-0372.pdf:2.81MB

 Times Cited Count:17 Percentile:15.51(Materials Science, Multidisciplinary)

Journal Articles

Dislocation density of GlidCop with compressive strain applied at high temperature

Sano, Mutsumi*; Takahashi, Sunao*; Watanabe, Atsuo*; Shiro, Ayumi*; Shobu, Takahisa

Materials Research Proceedings, Vol.2, p.609 - 614, 2017/00

Dislocation densities of GlidCop with compressive strain applied at high temperature were examined by X-ray line profile analyses with synchrotron radiation. In order to evaluate the dislocation density, we applied the modified Williamson-Hall and modified Warren-Averbach method. The dislocation densities of GlidCop with compressive strain from 0.011-0.04 were in the range of 5.7-8.0$$times$$10$$^{14}$$m$$^{-2}$$.

Journal Articles

Distribution and anisotropy of dislocations in cold-drawn pearlitic steel wires analyzed using micro-beam X-ray diffraction

Sato, Shigeo*; Shobu, Takahisa; Sato, Kozue*; Ogawa, Hiromi*; Wagatsuma, Kazuaki*; Kumagai, Masayoshi*; Imafuku, Muneyuki*; Tashiro, Hitoshi*; Suzuki, Shigeru*

ISIJ International, 55(7), p.1432 - 1438, 2015/07

 Times Cited Count:5 Percentile:60.41(Metallurgy & Metallurgical Engineering)

To characterize the distribution and anisotropy of dislocations in cold-drawn pearlitic steel wires, X-ray diffraction line-profile analysis was performed using synchrotron radiation micro-beams. The plastic shear strain was generally more severe near the surface than the center of the wire, whereas the dislocation density distribution was almost constant from the center to the surface. On the other hand, the dislocation rearrangement, which evolves the dislocation cell structure, progressed closer to the surface. It was also revealed that a difference between the hardness in axial and transverse wire directions could be explained by anisotropic dislocation density. Line-profile analysis based on diffraction data at elevated temperatures was performed. Whereas the cementite recovery progressed at a constant rate, the ferrite phase recovery rate was temperature-dependent, suggesting that the ferrite phase recovery was less related to that of the cementite phase.

Journal Articles

Effect of solute atoms on dislocation motion in Mg; An electronic structure perspective

Tsuru, Tomohito; Chrzan, D. C.*

Scientific Reports (Internet), 5, p.8793_1 - 8793_8, 2015/03

 Times Cited Count:45 Percentile:12.61(Multidisciplinary Sciences)

Much of the world's future economy hedges on the ability to improve the efficiency of mechanical machines without sacrificing their performance. This requires the development of lighter and stronger structural alloys. Magnesium alloys are very promising for structural applications, but they suffer from a fatal flaw. The mobility of the dislocations is determined by the bonding within the alloy, and this bonding is best modeled using approaches rooted firmly in quantum mechanics. Here, we compute the electronic structure of a screw dislocation gliding on a prismatic plane within Mg as it passes over its Peierls barrier. We show that the ductility of Mg is increased because some substitutional additions strongly bind to and stabilize a compact core structure for screw dislocations that are formally able to glide on both the basal and prismatic planes.

Journal Articles

Evaluation of ductile damage progress of aluminum single crystal with prior activity of single slip system under tensile loading by using synchrotron white X-ray

Shibano, Junichi*; Kajiwara, Kentaro*; Tsukamoto, Takuya*; kawai, Hirokazu*; Miura, Setsuo*; Zhang, S.*; Shobu, Takahisa; Kobayashi, Michiaki*

Materials Science Forum, 777, p.176 - 181, 2014/02

 Times Cited Count:1 Percentile:36.11

Journal Articles

Damage structures and mechanical properties in high-purity Fe-9Cr alloy irradiated by neutrons

Wakai, Eiichi; Hishinuma, Akimichi; Usami, Koji; Kato, Yasushi*; Takaki, Seiichi*; Abiko, Kenji*

Materials Transactions, JIM, 41(9), p.1180 - 1183, 2000/09

no abstracts in English

Journal Articles

Microstructural evolution during creep of Ni-base solid solution alloys and in-situ observation at high temperature

; *; Kikuchi, Kenji; ; Miura, Takayuki*

Proc. of 4th Int. Conf. on Recrystallization and Related Phenomena (REX'99), p.283 - 288, 1999/00

no abstracts in English

Journal Articles

Vanadium oxide precipitates in sapphire formed by ion implantation

Abe, Hiroaki; Naramoto, Hiroshi; Yamamoto, Shunya

Mat. Res. Soc. Symp. Proc., 504, p.393 - 398, 1998/00

no abstracts in English

Journal Articles

Formation and growth process of defect clusters in magnesia under ion irradiation

Abe, Hiroaki; *; Kinoshita, Chiken*; Naramoto, Hiroshi

Nuclear Instruments and Methods in Physics Research B, 127-128, p.176 - 180, 1997/00

 Times Cited Count:10 Percentile:35.23(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Ductilization of TiAl intermetallic alloys by neutron-irradiation

Hishinuma, Akimichi; Fukai, Katsumaro; Sawai, Tomotsugu; *

Intermet., 4, p.179 - 184, 1996/00

no abstracts in English

Journal Articles

X-ray diffuse scattering of quenched copper single crystals

Maeta, Hiroshi; Yamakawa, Koiji*; *; Haruna, K.*; Kato, Teruo; Ono, Fumihisa*

Nuclear Instruments and Methods in Physics Research B, 97, p.491 - 494, 1995/00

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Hydrogen migration in cold worked Pd around 50K

Yamakawa, Koiji*; Maeta, Hiroshi

Scr. Metall. Mater., 32(7), p.967 - 970, 1995/00

no abstracts in English

Journal Articles

Microstructure of Al$$_{2}$$O$$_{3}$$ and MgAl$$_{2}$$O$$_{4}$$ preimplanted with H, He, C and irradiated with Ar$$^{+}$$ ions

; S.J.Zinkle*; G.P.Pells*

Journal of Nuclear Materials, 209, p.191 - 203, 1994/00

 Times Cited Count:17 Percentile:18.84(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Effect of temperature and flux change on the behavior of radiation induced dislocation loops in pure aluminum

Jitsukawa, Shiro; Hojo, Kiichi

Journal of Nuclear Materials, 212-215, p.221 - 225, 1994/00

 Times Cited Count:5 Percentile:50.71(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

A Study of defect structures in fast neutron irradiated nickel at low temperature using magnetic anisotropy measurements

; *

Journal of the Physical Society of Japan, 55(1), p.193 - 199, 1986/00

 Times Cited Count:0 Percentile:100(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Observation of defect clusters in masked thin foil CU by He$$^{+}$$ ion irradiation

*; *; *; ; ;

Proc.XIth Int.Cong.on Electron Microscopy, p.1281 - 1282, 1986/00

no abstracts in English

JAEA Reports

Analysis of Behavior on Solution and Diffusion of Hydrogen in Iron

JAERI-M 83-052, 66 Pages, 1983/03

JAERI-M-83-052.pdf:1.84MB

no abstracts in English

27 (Records 1-20 displayed on this page)