Helium Bubble Kinetics during Laser Welding of Helium-Doped Stainless Steel(Materials, Metallurgy & Weldability)
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概要
- 論文の詳細を見る
Helium is generated within neutron-irradiated reactor components and entrapped in the stainless steel components. The repair of the components using conventional GTA welding practices is then exceedingly difficult, because of the creation of helium bubbles and weld cracking. In this research, the behavior of helium bubbles in austenitic stainless steel weldments was investigated using stainless steel helium ion-implanted and then welded using YAG Laser apparatus. Helium ion implanting of the sample was carried out using 8MeV implantation apparatus, the sample being doped 2.45x10^<19>/m^2 at 6MeV and then doped 1x 10^<19>/m^2 at 5MeV. Helium bubbles are present at the bond region, heat-affected zone and weld metal. An increase of weld heat input causes the growth of helium bubbles and produce toe cracks and cracks along the dendrite cell boundary in the weld metal. The helium bubble phenomena can be simulated in the weld metal and in the heat-affected zone during repair welding using helium ion implanting technique.
- 大阪大学の論文
著者
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MATSUDA Fukuhisa
Osaka University
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KURODA Toshio
Osaka University
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FUJIYA Yasuyuki
Mitsubishi Heavy Industries, Ltd
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Matsuda Fukuhisa
Osaka Univ.
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Fujiya Yasuyuki
Mitsubishi Heavy Industries Ltd
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