On the effect of s-phase formation during metal dusting
Changes in microstructure and mechanical properties have been characterized in HK-40 steel subjected to high-temperature corrosion by metal dusting. Samples with several grades of corrosion were analyzed. *s-Phase precipitation and growth caused Cr and Si depletion in the surrounding metallic matrix...
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Published in | Materials chemistry and physics Vol. 84; no. 1; pp. 20 - 28 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
15.03.2004
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Online Access | Get full text |
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Summary: | Changes in microstructure and mechanical properties have been characterized in HK-40 steel subjected to high-temperature corrosion by metal dusting. Samples with several grades of corrosion were analyzed. *s-Phase precipitation and growth caused Cr and Si depletion in the surrounding metallic matrix next to it, which in turn reduced HK-40 metal dusting resistance. Average C content increased from 0.40 in the as-cast material, to 0.49 in samples with medium and high grades of metal dusting, due to C diffusion through the carbide layer present in the inner surface. In the samples, inner edge RB hardness reduced from 99 RB, in a sample with negligible metal dusting, to around 60 in one with severe metal dusting attack. This hardness reduction was mainly associated to a process of carbide precipitation and growth that took place as C diffused into the samples. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0254-0584 |
DOI: | 10.1016/j.matchemphys.2003.09.041 |