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Journal Articles

Analysis of plastic deformation behavior at SCC crack tip by EBSP method

Kaji, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi

Nippon Kikai Gakkai M&M 2005 Zairyo Rikigaku Kanfarensu Koen Rombunshu, p.175 - 176, 2005/12

From results of analysis of plastic deformation behavior at SCC crack tip by EBSP method, the conclusions was obtained as follows: (1)Regarding to basic data for quantitative evaluation of plastic deformation behavior at SCC crack tip, we obtained relationship between plastic deformation and misorientation of grain using SSRT result for SUS316L stainless steel in high temperature water and local plastic strain was able to estimate using this relationship. (2)From experimental results of plastic strain at SCC crack and ductile crack tips using relationship between misorientation and plastic deformation, plastic strain near ductile crack tip was larger than that at SCC crack tip. Plastic deformation region was, however, corresponded to region of about one grain at crack tip for both SCC and ductile cracks.

JAEA Reports

Multi-scale analysis of deformation behavior at SCC crack tip (Contract research)

Kaji, Yoshiyuki; Miwa, Yukio; Tsukada, Takashi; Hayakawa, Masao*; Nagashima, Nobuo*; Matsuoka, Saburo*

JAERI-Research 2005-029, 156 Pages, 2005/09

JAERI-Research-2005-029.pdf:57.24MB

This report describes a result of the research conducted under contract with JNES that was concerned with a multi-scale analysis of plastic deformation behavior at the crack tip of SCC. The research was carried out to evaluate the validity of the SCC growth data acquired in the IGSCC project based on a mechanistic understanding of SCC. For the purpose, in this research, analyses of the plastic deformation behavior and microstructure around the crack tip were performed in a nano-order scale. The hardness measured in nano, meso and macro scales was employed as a common index of the strength, and the essential data necessary to understand the SCC propagation behavior were acquired and analyzed that are mainly a size of plastic deformation region and a microstructural information in the region, e.g. data of crystallografy, microscopic deformation and dislocations at the inside of grains and grain boundaries.

Journal Articles

Plastic deformation behavior of type 316LN stainless steel in non-irradiated, thermallysensitized condition or in irradiated condition during SSRT

Miwa, Yukio; Tsukada, Takashi; Jitsukawa, Shiro

Proceedings of 12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors (CD-ROM), p.311 - 318, 2005/00

Plastic deformation behavior to influence the stress corrosion cracking was studied for the thermally-sensitized and the irradiated type 316LN stainless steel. SSRT was conducted at 573 K in oxygenated water (DO=10ppm) for specimens. Each of the specimens was thermally sensitized at 1033 K for 100 h or irradiated at 473 K to 1 dpa. Between these specimens, the plastic deformation behavior and the IGSCC were compared. For the irradiated specimens, plastic deformation behavior such as the work hardening capability and the maximum stress where IASCC initiated was similar to that of thermally-sensitized specimens in true stress-true strain relation. Moreover, the effect of strain rate on %IGSCC was the same each other. It was suggested from these results that for specimens irradiated around 1 dpa, the initiation mechanism of IASCC was similar to that of IGSCC for thermally-sensitized specimens.

Journal Articles

Radiation effects on the plasticity and microstructure of Ti-Al-V alloys containing $$beta$$ phase

Sawai, Tomotsugu; Tabuchi, Masayuki*; Wakai, Eiichi; Hishinuma, Akimichi

Proceedings of Materials Research Society Symposium, Vol.650, p.R3.9.1 - R3.9.6, 2001/00

no abstracts in English

JAEA Reports

Passive electromagnetic NDE for mechanical damage inspection by detecting leakage magnetic flux; II An experimental study on the correlation of natural magnetization and mechanical damages in the SUS304 stainless steel

; Aoto, Kazumi; ;

JNC-TN9400 2000-022, 46 Pages, 2000/03

JNC-TN9400-2000-022.pdf:3.2MB

ln this report, a study on the behaviors of the magnetization induced by mechanical damages is carried out. By introducing mechanical damages to a test-piece with a tension or/and a zero, tension fatigue testing and measuring the corresponding leakage flux signal, natural magnetization change is proved and found increasing with the mechanical damages (viz. plastic deformation or fatigue damages) though a saturation occurs when damage gets too large. From the experimental results of fatigue testing utilizing test-pieces with a central slit, it was verified that observing the natural leakage flux density (leakage flux without applying external magnetic field) is a reasonable way to identify fatigue cracks. A feature parameter (area of the $$varepsilon$$$$sim$$B hysteresis curve) of the in-situ magnetic field signal measured during the fatigue testing is proposed for predicting the fatigue damages, which is found depending on the cyclic number of the applied loading. At last, residual magnetic fields of a magnetized test-piece are also measured and found depending on the applied plastic deformation in case that the plastic strain is not too small. From these experimental results, it is found that the approach detecting natural magnetization is applicable for monitoring the damage status though it may be not efficient for a scanning inspection concerning its small signal magnitude. On the other hand, the method employing permanent magnet is robust against the environment noise but possibly not valid for the ISl of a structural component with a relative low damage level. For practical application, efforts to evaluate the feasibility of the proposed method are necessary for more testing conditions especially its suitability in a practical environment.

Journal Articles

Development of residual stress measurement apparatus by neutron diffraction and its application to bent carbon steel

*; Okido, Shinobu*; Minakawa, Nobuaki; Morii, Yukio

Zairyo, 47(4), p.420 - 426, 1998/04

no abstracts in English

Journal Articles

Behavior of neutron-irradiated U$$_{3}$$Si

Ugajin, Mitsuhiro; Akabori, Mitsuo; Ito, Akinori; Ooka, Norikazu;

Journal of Nuclear Materials, 248, p.204 - 208, 1997/00

 Times Cited Count:6 Percentile:49.12

no abstracts in English

JAEA Reports

None

Kato, Masato

PNC-TN8600 94-005, 132 Pages, 1994/08

PNC-TN8600-94-005.pdf:7.95MB

no abstracts in English

JAEA Reports

None

Kato, Masato

PNC-TN8600 94-004, 184 Pages, 1994/08

PNC-TN8600-94-004.pdf:9.48MB

no abstracts in English

JAEA Reports

Mechanical and hydrological variation of rock mass around a shaft excavated in Neogene sedimentary rocks

; ; Sato, Toshinori;

PNC-TN7410 92-046, 56 Pages, 1992/12

PNC-TN7410-92-046.pdf:1.27MB

As a result of underground excavation to construct an underground facility, an excavation disturbed zone (EDZ) is often generated in rock mass around a shaft and a drift. In order to design and construct an underground facility, and to evaluate its long-term stability, it is necessary to understand the phenomena related to excavation disturbance. PNC (Power Reacter and Nuclear Fuel Development Corporation) excavated a shaft of 6m diameter and 152.3m depth in Neogene sedimentary rocks, and studied the influence induced by the shaft excavation on rock mass and groundwater flow around the shaft. This project was named SEE (Shaft Excavation Effects) project, and was carried out from 1978 to 1991. This report described a part of the SEE Project, focusing on mechanical and hydrological variation of rock mass around the shaft. The current conclusions were su㎜arized as follows: (1)Mechanical and hydrological variation of rock mass around the shaft was induced by stress redistribution and fracturing around the shaft. (2)The zone where mechanical and hydrological characteristics were varied was extended about 1m from shaft wall. (3)It is considered that unrecoverable deformation is generated in rock mass around a shaft because of fracturing and plastic deformation. We introduced a concept of permanent deformation modulus to take account of the unrecoverable deformation, and estimated the results of borehole jack tests. Consequently, we found the permanent deformation modulus was useful to identify the EDZ.

Journal Articles

Plastic strain caused by contraction of pores for polycrystalline graphites

Ioka, Ikuo; *; Konishi, Takashi*

Zairyo, 38(434), p.1247 - 1253, 1989/11

no abstracts in English

Journal Articles

Lifetime analysis for fusion reactor first walls and divertor plates

; *; Minato, Akio; Tone, Tatsuzo

Nucl.Eng.Des./Fusion, 5, p.221 - 231, 1987/00

no abstracts in English

Journal Articles

Mechanical properties of lithium oxide at high temperatures

; *; ; *; *; *;

J.Nucl.Mater., 141-143, p.353 - 356, 1986/00

 Times Cited Count:12 Percentile:21.3

no abstracts in English

Journal Articles

The Tensile deformation behavior of nuclear-grade isotropic graphite posterior to hydrostatic loading

;

J.Nucl.Mater., 118, p.214 - 219, 1983/00

 Times Cited Count:3 Percentile:54.41

no abstracts in English

15 (Records 1-15 displayed on this page)
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