Experimental analysis highlights improved oxidation resistance of ferritic stainless steel with Al, suggesting significant implications for automotive applications.
The influence of Al addition on ferritic stainless steel oxidation resistance has been investigated. Experiments are performed using a synthetic automotive exhaust gas at 950 °C and 1050 °C. In the case of 0Al steel, a double‐layered oxide scale is observed at both temperatures. At 1050 °C, the oxide scale exhibits cracking due to thermal stress. Oxidizing atmosphere penetration results in Si enrichment at the oxide scale/substrate interface. Ultimately, multilayered Si‐rich bands are formed sequentially in the oxide scale. In contrast, 0.7Al steel forms a protective Al 2 O 3 layer at the oxide scale/substrate interface, and needle‐shaped Al 2 O 3 is formed under it due to volume shrinkage. Anion and cation diffusion are inhibited by the upper Al 2 O 3 layer, preventing substrate corrosion. The findings of this work demonstrate a significant enhancement of oxidation resistance due to Al addition.
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Liao et al. (2025) studied this question.
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