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http://dx.doi.org/10.3740/MRSK.2006.16.5.318

Microstructural Analysis and High Temperature Compression Behavior of High Temperature Degradation on Hastelloy X  

Kim, Gil-Su (Division of Materials Science and Engineering, Hanyang University)
Jo, Tae-Sun (Division of Materials Science and Engineering, Hanyang University)
Seo, Young-Ik (Division of Materials Science and Engineering, Hanyang University)
Ryu, Woo-Seog (Division of Nuclear Materials Technology and Development, Korea Atomic Energy Research Institute)
Kim, Young-Do (Division of Materials Science and Engineering, Hanyang University)
Publication Information
Korean Journal of Materials Research / v.16, no.5, 2006 , pp. 318-322 More about this Journal
Abstract
Short-term high temperature degradation test was conducted on Hastelloy X, a candidate tube material for high temperature gas-cooled reactors (HTGR), to evaluate the variation of microstructure and mechanical property in air at $1050^{\circ}C$ during 2000 h. The dominant oxide layer was Cr-oxide and a very shallow Cr-depleted region was observed below the oxide layer. At the beginning of degradation, the island shape $M_6C$ precipitate (M=Mo-rich, Fe, Ni, Cr) was observed in matrix region. After 2000 h degradation, precipitate shape was changed to the chain shape and increased amount of precipitate. These results influenced mechanical property of the specimen which exposed in high temperature. Yield strength was decreased from 115MPa to 89 MPa after 24 h and 2000 h exposure, respectively.
Keywords
Hastelloy X; High temperature degradation; High temperature compression; Oxidation;
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