Microstructure and elevated-temperature erosion-oxidation behaviour of aluminized 9Cr-1Mo Steel

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dc.contributor.author Huttunen, E.
dc.contributor.author Honkanen, M.
dc.contributor.author Tsipas, Sophia Alexandra
dc.contributor.author Omar, H.
dc.contributor.author Tsipas, D.
dc.date.accessioned 2015-04-09T11:10:41Z
dc.date.available 2015-04-09T11:10:41Z
dc.date.issued 2012-10
dc.identifier.bibliographicCitation Applied Surface Science (2012). 259, 674-684.
dc.identifier.issn 0169-4332
dc.identifier.uri http://hdl.handle.net/10016/20399
dc.description.abstract Degradation of materials by a combination of erosive wear and atmospheric oxidation at elevated temperatures constitutes a problem in some power generation processes, such as fluidized-bed combustion. In this work, 9Cr-1Mo steel, a common tube material in combustion chambers, is coated by a pack cementation method from an Al-containing pack in order to improve the resistance to erosion-oxidation at elevated temperatures. The resulting coating is studied in terms of microstructure and microhardness and tested for its resistance against impacts by sand particles in air at temperatures of 550-700 degrees C under several conditions, with thickness changes and appearance of the exposed surfaces being studied. The coating was found to contain several phases and layers, the outermost of which was essentially Al-rich and contained e. g., small AlN precipitates. The microhardness values for such coating ranged from 950 to 1100 HV20g. The coating provided the substrate with increased protection particularly against normal particle impacts, as manifested by smaller thickness losses for coated specimens as compared to uncoated counterparts. However, much of the coating was lost under all test conditions, despite the fact that particle debris formed a homogeneous layer on the surface. These results are described and discussed in this paper.
dc.description.sponsorship E.H.-S. is grateful to the Academy of Finland for research funding (decisions 111948, 106160 and 218296). The European Commission is also acknowledged for funding of a research training network (contract HPRN-CT-2001-00201).
dc.format.extent 11
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2012 Elsevier B.V
dc.subject.other Coating
dc.subject.other Steel
dc.subject.other Pack cementation
dc.subject.other Erosion-oxidation
dc.subject.other Microhardness
dc.title Microstructure and elevated-temperature erosion-oxidation behaviour of aluminized 9Cr-1Mo Steel
dc.type article
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1016/j.apsusc.2012.07.096
dc.subject.eciencia Materiales
dc.identifier.doi 10.1016/j.apsusc.2012.07.096
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 674
dc.identifier.publicationlastpage 684
dc.identifier.publicationtitle Applied Surface Science
dc.identifier.publicationvolume 259
dc.identifier.uxxi AR/0000011335
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