High Temperature Oxidation Behavior of Nickel and Iron Based Superalloys in Helium Containing Trace Impurities
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A high-temperature gas-cooled reactor (HTGR) is recognized as the best candidate reactor for next generationnuclear reactors. Helium is used to be the coolant in the core of the HTGR with temperature expectedto exceed 900 °C at the core outlet. Several iron- and nickel-based superalloys, including Alloy 800H,Hastelloy X, and Alloy 617, are potential structural materials for intermediate heat exchanger (IHX) inan HTGR. Oxidation behaviors of three selected alloys (Hastelloy X, Alloy 800H, and Alloy 617) wereinvestigated at four different temperatures from 650°C to 950 °C under helium environments with variousconcentrations of O2 and H2O. Preliminary results showed that chromium oxide as the primary protectivelayer was observed on surfaces of the three tested alloys. Based on results of mass gain and SEM analyses,Hastelloy X alloy exhibited the best corrosion resistance in all corrosion tests. Further details on the oxidationmechanism of these alloys are presented in this study.
Abstract
A high-temperature gas-cooled reactor (HTGR) is recognized as the best candidate reactor for next generationnuclear reactors. Helium is used to be the coolant in the core of the HTGR with temperature expectedto exceed 900 °C at the core outlet. Several iron- and nickel-based superalloys, including Alloy 800H,Hastelloy X, and Alloy 617, are potential structural materials for intermediate heat exchanger (IHX) inan HTGR. Oxidation behaviors of three selected alloys (Hastelloy X, Alloy 800H, and Alloy 617) wereinvestigated at four different temperatures from 650°C to 950 °C under helium environments with variousconcentrations of O2 and H2O. Preliminary results showed that chromium oxide as the primary protectivelayer was observed on surfaces of the three tested alloys. Based on results of mass gain and SEM analyses,Hastelloy X alloy exhibited the best corrosion resistance in all corrosion tests. Further details on the oxidationmechanism of these alloys are presented in this study.
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