Austenitization triggering breakaway oxidation of FeCr-base alloys at 900 °C
Source abstract
Abstract
Oxidation of Fe18Cr-X (X = Mo, Si) alloys in Ar-H 2 -H 2 O gas mixtures has been studied at 900 °C. The α-to-γ transformation at the Cr-depleted specimen edges is demonstrated to be the primary reason of breakaway oxidation. A diffusion analysis predicted protective behavior for ferritic (BCC) Fe-18Cr at 900 °C and loss of protection once austenite (FCC) is formed. Alloying Fe-18Cr with Si or coating with Ce resulted in a significantly lower oxidation rate and thus protective oxidation behavior while alloying with a ferrite stabilizing element (Mo) completely prevented breakaway oxidation not affecting the oxidation rate. • Binary ferritic Fe-18Cr alloy suffers from severe breakaway oxidation at 900 °C • Breakaway oxidation initiates at sharp edges and spreads laterally over the entire surface. • Coating Fe-18Cr with 10 nm Ce lowers oxidation rate and thus suppresses catastrophic oxidation. • Alloying Fe-18Cr with 0.5 % Si or 2 % Mo results in a protective oxidation behavior. • An austenitization mechanism of breakaway oxidation is proposed and validated.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advanced materials and composites · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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