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Stress Corrosion Cracking Behavior at Inconel and Low Alloy Steel Weld Interfaces |
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| Authors: | Yo Tomota Shin Daikuhara Shun Nagayama Masanori Sugawara Norihiko Ozawa Yoshitaka Adachi Stefanus Harjo Shigeo Hattori |
| Affiliation: | 1. Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan 2. Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki, 316-8511, Japan 3. Engineering Department of Nidack Seimitsu Inc, 338 Tonoshiro-cho, Kuze Minami-ku, Kyoto, 601-8205, Japan 4. Material Test and Measure Section, Hitachi Power Solutions Co., Ltd., 3-10-2, Benten, Hitachi, Ibaraki, 319-0072, Japan 5. Department of Mechanical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima, 890-0065, Japan 6. J-PARC Center, Japan Atomic Energy Agency, 2-4, Shirane Shirakata, Tokai, Ibaraki, 319-1195, Japan 7. Corrosion Center, Japan Society of Corrosion Engineering, 2-13-10, Hongo, Bunkuyo-Ku, Tokyo, 113-0033, Japan |
| Abstract: | Three-dimensional microstructure observations, macro- to micro-scopic residual stress measurements by three methods and creviced bent beam SCC tests were performed for Inconel/low alloy steel (LAS) weld samples. The possible reasons for the suppression of SCC crack propagation near the weld interface found at a nuclear power plant were estimated to include the crack branching at the grain boundary (GB) parallel to the interface, i.e., Type II GB, compressive residual stresses in the LAS region and crack tip oxidation in the LAS at the interface. The formation mechanism of Type II GB and stress gradient in individual grains in the Inconel are also discussed. |
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