The impact of the microstructure of Fe-16Cr-0.2C on high-temperature oxidation – sulphidation in SO2. (September 2021)

• Record Type: Journal Article
• Authors: Falk, Florian; Sobol, Oded; Stephan-Scherb, Christiane
• Is Part Of: Corrosion science. Volume 190(2021)
• Publication Date: 2021-09
• Subjects: A. Steel -- A. Iron -- B. SIMS -- B. SEM -- C. High-temperature corrosion -- C. Oxidation -- C. Sulphidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109618
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Chromia growth can be related to microstructural properties. Sulphur was discovered within chromia by ToF-SIMS. Sulphidation was independent on the alloy microstructure. Grain refinement is beneficial to reduce sulphidation. Abstract: This study elucidates the impact of the microstructure of Fe-16Cr-0.2C on oxide layer formation at 650 °C in Ar-0.5 % 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.