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05pD14P
F82H316L間及び316L316L間の溶接部におけるシャルピー衝撃特性
Charpy Impact Properties of F82H/316L and 316L/316L Welded Steels
中庭 浩一1*，伊藤 譲1，古谷 一幸2，芹澤 久3，川人 洋介3，若井 栄一1Koichi Nakaniwa1*, Yuzuru Ito1, Kazuyuki Furuya2, Hisashi Serizawa3, Yosuke Kawahito3, Eiichi Wakai1
1
1

日本原子力研究開発機構，2八戸工業高等専門学校，3大阪大学

Japan Atomic Energy Agency, 2Hachinohe National College of Technology，3Osaka University

1. Introduction and background
InternationalFusion
Materials
Irradiation
Facility/Engineering Validation and Engineering Design
Activities (IFMIF/EVEDA) are in progress, a periodic
replacement is necessary for the Target Assembly (TA)because the materials at back-plate of TA are severely
damaged by neutron irradiation. The remotely-handled
welding is required to connect the renewed TA into thelithium loop for the maintenance.
In this study, an engineering validation test andengineering design evaluation on the lip-seal welding
technique which includes the weldability of dissimilar
metals has been reported.

2. Experimental
The test method of Charpy impact test was compliant
with JIS Z 3128 “Method of Impact test for Welded Joint”.
The Charpy specimen was fabricated from both material; thewelded joint by two of the type 316L steels (Specimen ID.
12-9) and the welded joint by type 316L steel and F82Hsteel (Specimen ID. F82). The Specimen ID. F82 is regarded
as a dissimilar metal joint. The specimens for Charpy impact
test are shown in Fig.1.

3. Results and Discussion
The results of Charpy impact test is shown in Table 1.
The impact values 128 J/cm2 and 81 J/cm2 were measured inthe 316L/316L joint and dissimilar metal joint, respectively.
The obtained impact data in this study was compared todata which had been reported in the paper [1] by Hara et.al.
including such as Charpy impact data of base metal,
SUS316L because there was no test data with base metal.
However, it is difficult to compare directly to the reported
data because its data obtained by using the specimen welded

an Electron Beam (EB) butt-welding not TIG welding. But,
the comparing the reported data between welded region andbase metal is useful as a reference in order to assess theobtained impact data.
The impact value (128 J/cm2) at the 316L/316L joint inthis study is about 79% of the reported value (163 J/cm2)
which is measured at the base metal of type 316L steel. The
impact value(120 J/cm2) measured at the base metal of F82H
steel and the impact value(76 J/cm2) measured at thedissimilar weld joint of F82H steel and type 316L steel havebeen also reported in the paper, as well. The dissimilar weld
joint of F82H steel and type 316L steel shows about 36%lower impact value than that of the base metal of F82H steel.
Therefore, an impact value measured at welded region
would be lower than that of base metal region.
The impact value obtained at the 316L/316L joint inthis study looks reasonable data considering the comparison
with a reference data even though some differences exist
such as welding method and types of joint. On the other
hand, the impact value obtained at the dissimilar weld jointof F82H steel and type 316L steel in this study is almost
same to the value reported in the paper. Although thenumber of test in this study, that is N=1, the obtained data
would be reasonable considering the comparison with areference data. But, it is necessary increasing the number oftest in order to improve the quality of measured data.

4. Summary
It is found that the obtained data in this study would bereasonable considering the comparison with a reference data.
But, it is necessary increasing the number of test in order toimprove the quality of measured data.

Acknowledgments
This study was performed as a part of theIFMIF/EVEDA program. Charpy impact test was performedby Sumitomo Metal Technology, Inc.

Specimen ID. 12-9References

Specimen ID. F82(Filler Metal .Y309 )[1] N. Hara, Fusion Science and Technology, Vol. 56 (2009),
pp.-318-322.

Fig.1 The specimens for Charpy impact test

Table 1 The results of Charpy impact test
Specimen shape [mm]Specimen
ID.

Weldment

Temperature [°C]F82

316L/82H

12‐9316L/316L

Absorbed energy [J]Impact value[J/cm2]

Percent of ductile
fracture [%]Thickness

Width

Length

RT

7.97

9.97

54.99

64

80.54

30

RT

7.98

1.71

54.82

17.5

128.2420