1. Stress Corrosion Cracking Behavior at Inconel and Low Alloy Steel Weld Interfaces
- Author
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Stefanus Harjo, Yoshitaka Adachi, Yo Tomota, Shigeo Hattori, Shun Nagayama, Shin Daikuhara, Norihiko Ozawa, and Masanori Sugawara
- Subjects
Materials science ,Alloy steel ,Metallurgy ,Metals and Alloys ,Fracture mechanics ,Welding ,engineering.material ,Condensed Matter Physics ,Microstructure ,law.invention ,Mechanics of Materials ,law ,Residual stress ,engineering ,Grain boundary ,Stress corrosion cracking ,Inconel - 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.
- Published
- 2014
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