caa a22 4500 44584406X CHVBK 20180317145353.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11085-010-9223-5 doi (NATIONALLICENCE)springer-10.1007/s11085-010-9223-5 High Temperature Oxidation Behavior of Alloy 617 and Haynes 230 in Impurity-Controlled Helium Environments [Elektronische Daten] [Daejong Kim, Injin Sah, Donghoon Kim, Woo-Seog Ryu, Changheui Jang] The high temperature oxidation behavior of alloy 617 and Haynes 230 have been investigated for VHTR intermediate heat exchanger applications. Oxidation tests were carried out for up to 500h at 900°C and 1000°C in impure helium environments containing H2, H2O, CO, CO2, and CH4. The oxidation kinetics of the alloys followed a parabolic rate law in all cases. In the impure helium environments with very low oxygen, the external oxides of alloy 617 were composed of a Cr2O3 layer, TiO2 ridges on the grain boundaries, and isolated MnCr2O4 grains on top of the Cr2O3 layer. On the other hand, those of Haynes 230 consisted of a Cr2O3 inner layer and a protective MnCr2O4 outer layer, which increased the oxidation resistance. The effect of small amounts of CH4 and H2 on the oxidation kinetics of the alloys was insignificant. Irregular oxide morphology, such as cellular Cr2O3 oxides for alloy 617 and MnCr2O4 platelets for Haynes 230, was formed in the impure helium environment at 900°C. For Haynes 230, along with platelets, whiskers were frequently found at the tip of the MnCr2O4 oxide crystals. Springer Science+Business Media, LLC, 2010 Oxidation nationallicence Nickel-base superalloys nationallicence VHTR nationallicence Impure helium nationallicence Alloy 617 nationallicence Haynes 230 nationallicence Kim Daejong Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut Sah Injin Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut Kim Donghoon Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut Ryu Woo-Seog Nuclear Materials Technology Development Division, KAERI, 150 Deogjin-dong, Yuseong-gu, 305-600, Daejeon, Republic of Korea aut Jang Changheui Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut Oxidation of Metals Springer US; http://www.springer-ny.com 75/1-2(2011-02-01), 103-119 0030-770X 75:1-2<103 2011 75 11085 https://doi.org/10.1007/s11085-010-9223-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-010-9223-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Daejong Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Sah Injin Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Kim Donghoon Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Ryu Woo-Seog Nuclear Materials Technology Development Division, KAERI, 150 Deogjin-dong, Yuseong-gu, 305-600, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Jang Changheui Department of Nuclear and Quantum Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Republic of Korea aut NATIONALLICENCE 773 0- Oxidation of Metals Springer US; http://www.springer-ny.com 75/1-2(2011-02-01), 103-119 0030-770X 75:1-2<103 2011 75 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer