The impact of the microstructure of Fe-16Cr-0.2C on high-temperature oxidation - sulphidation in SO2

This study elucidates the impact of the microstructure of Fe-16Cr-0.2C on oxide layer formation at 650 degrees C in Ar0.5 % SO2. A cold-rolled and two heat-treated states of the alloy were exposed for up to 1000 h. The samples were characterised in detail from microstructural and chemical perspectives using scanning electron microscopy (SEM), X-ray diffraction (XRD) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The microstructural modification of the alloy by heat-treatment was advantageous. It was found that Cr-carbides support chromia formation and reduce sulphidation when their area fraction is low and diameter is small.

Automated summary

This study investigates the impact of the microstructure of Fe-16Cr-0.2C on oxide layer formation at 650 degrees C in Ar0.5 % SO2. The results show that heat-treatment modification of the alloy is advantageous, with Cr-carbides supporting chromia formation and reducing sulphidation when their area fraction is low and diameter is small.