Abstract
The effects of alloy grain boundaries on the oxidation behaviors of alloy 430 and 441 in dual atmospheres (wet Ar-5vol% H2|35ml/min dry air) at 800ºC for 100, 200 and 400 hours were investigated. The samples with large grain size (430: 50µm and 441: 150 µm) were tested. For alloy 430, the surface of the scale formed on the air side area after 100 and 200hr of dual atmosphere oxidation contained many Fe-rich nodules along alloy grain boundaries. For alloy 441, all the oxide scales were composed mainly of a surface (Mn,Cr,Fe)3O4 spinel layer and a Cr2O3 sublayer. Only some isolated areas contained Fe-rich nodules on the air side of sample exposed to a dual atmosphere.
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