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Effects of tube drawing on structural material for ITER test blanket module

Hirose, Takanori; Tanigawa, Hiroyasu; Enoeda, Mikio; Akiba, Masato

This paper presents the effects of tube milling process on microstructural properties of F82H, which is one of the most important issues for fabrication of the module. The 3500 mm long square tubes have been developed by cold rolling method. This tube is long enough to fabricate the first wall without any joint in the cooling path. Its surface roughness (Rz) and outer curvature are less than 1 microns and 1.4 mm, respectively. It is fine enough to reduce the assembly gap for Hot Isostatic Pressing (HIP) joint. Although the process introduced stretched microstructure containing dense precipitates, this anisotropic microstructure was successfully recovered by heat treatments corresponding to HIP process. This shows the milling process verified in this work could be applicable to blanket fabrication process.

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Category:Nuclear Science & Technology

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