Evalulation of charpy impact properties and fracture toughness for irradiated ferritic steels (4)

not registered

In order to evaluate the radiation-induced shift of fracture toughness from Charpy impact test results for miniaturized specimens, all of the Charpy impact data on high-strength ferritic steels developed by JNC were examined on the basis of the recent progess on the Charpy impact and fracture toughness test methods. Main results obtained are as follows. (1)The radiation-induced shift of fracture toughness is characterized by the shift of the reference fracture toughness temperature, T $_{100}$ , where T $_{100}$ is the temperature at which the fracture toughness value is 100MPa . T $_{100}$ is approximately equal to the radiation-induced shift of Charpy DBTT at 41J ( T $_{41}$ ), Therefore, T $_{100}$ can be estimated by determining T $_{41}$ from miniaturized Charpy specimen data. (2)The value of T $_{41}$ for miniaturized specimens, T $_{41}$ $^{M}$ , can be determined as the test temperature where the absorbed energy is equal to 41/ x[(Bb) $^{3/2}$ $_{F}$ /(Bb) $^{3/2}$ $_{M}$ ]. Here, B is the specimen thickness, b is the ligament size and x [(Bb) $^{3/3}$ $_{F}$ /(Bb) $^{3/2}$ $_{M}$ ] is the normalization factor to get the upper shelf energy of full size specimens, USE $^{F}$ , from the mini-size USE $^{M}$ . The values of is larger than 0.65, depending on the USE of the material. It is also shown that the fracture volume of (Bb) $^{3/2}$ is more valid than that of Bb $^{2}$ . (3)The following relationship appears to hold between T $_{41}$ $^{F}$ and T $_{41}$ $^{M}$ [T $_{41}$ $^{F}$ - T $_{41}$ $^{M}$ = M = 98 - 15.1 ln(Bb) $^{3/2}$ ,] where M is the specimen size correction factor. M also depends on notch geometry and its dependence becomes large with decreasing specimen size. This indicates that the value of T $_{41}$ $^{F}$ can be estimated fom T $_{41}$ $^{M}$ by choosing suitable notch geometry. (4)The radiation-induced shift of T $_{41}$ $^{F}$ , T $_{41}$ $^{F}$ , is approximately equal ...

Language	:	Japanese
Report No.	:	JNC TJ9400 2000-016
Pages	:	46 Pages
Publication Year/Month	:	2000/03
Patent information	:
PDF	:	JNC-TJ9400-2000-016.pdf:1.01MB
Paper URL	:
Keywords	:	no keyword
Research Facility	:
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	東北大学
Other institute's report number	:

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Registration No. : GJ0920000008
JAEA Abstracts No. :

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