Abstract
Effects of precipitated intragranular intermetallic compounds on the initial oxidation behavior of a new alumina-forming austenitic (AFA) steel and its base steel in supercritical carbon dioxide are investigated. Laves phase is the only precipitate in the base steel, which leads to the internal oxidation and destroys the integrity of oxide. B2-NiAl, Sigma and Laves phases are precipitated in AFA steel. B2-NiAl particle acts as Al-reservoir and Laves particle retards the formation of thick Cr-rich oxide. Sigma phase accelerates the growth of Cr/Si-rich oxides, which contributes to the formation of a thicker Cr/Si-rich oxide layer.
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