NDLI: High Temperature Oxidation Behavior of Alloy 617 and Haynes 230 in Impurity-Controlled Helium Environments

Content Provider	Springer Nature Link
Author	Kim, Daejong Sah, Injin Kim, Donghoon Ryu, Woo Seog Jang, Changheui
Copyright Year	2010
Abstract	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 500 h at 900 °C and 1000 °C in impure helium environments containing H$_{2}$, H$_{2}$O, CO, CO$_{2}$, and CH$_{4}$. 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 Cr$_{2}$O$_{3}$ layer, TiO$_{2}$ ridges on the grain boundaries, and isolated MnCr$_{2}$O$_{4}$ grains on top of the Cr$_{2}$O$_{3}$ layer. On the other hand, those of Haynes 230 consisted of a Cr$_{2}$O$_{3}$ inner layer and a protective MnCr$_{2}$O$_{4}$ outer layer, which increased the oxidation resistance. The effect of small amounts of CH$_{4}$ and H$_{2}$ on the oxidation kinetics of the alloys was insignificant. Irregular oxide morphology, such as cellular Cr$_{2}$O$_{3}$ oxides for alloy 617 and MnCr$_{2}$O$_{4}$ 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 MnCr$_{2}$O$_{4}$ oxide crystals.
Starting Page	103
Ending Page	119
Page Count	17
File Format	PDF
ISSN	0030770X
Journal	Oxidation of Metals
Volume Number	75
Issue Number	1-2
e-ISSN	15734889
Language	English
Publisher	Springer US
Publisher Date	2010-12-14
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Oxidation Nickel-base superalloys VHTR Impure helium Alloy 617 Haynes 230 Tribology, Corrosion and Coatings Inorganic Chemistry Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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