Degradation of stainless steel grids in chemically aggressive environment

dc.contributor.author	Ψυλλάκη, Π.	el
dc.contributor.author	Πανταζόπουλος, Γιώργος	el
dc.contributor.author	Πιστόλη, Α.	el
dc.date.accessioned	2015-06-15T23:17:51Z
dc.date.available	2015-06-15T23:17:51Z
dc.date.issued	2015-06-16
dc.identifier.uri	http://hdl.handle.net/11400/16181
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.sciencedirect.com	en
dc.subject	Embrittlement
dc.subject	Ευθραυστότητα
dc.title	Degradation of stainless steel grids in chemically aggressive environment	en
heal.type	journalArticle
heal.classification	Technology
heal.classification	Geology
heal.classification	Τεχνολογία
heal.classification	Γεωλογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://skos.um.es/unescothes/C01676
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Γεωλογία
heal.identifier.secondary	doi:10.1016/j.engfailanal.2013.04.016
heal.language	en
heal.access	campus
heal.publicationDate	2013-12-15
heal.bibliographicCitation	Psyllaki, P., Pantazopoulos, G. and Pistoli, A. (2013) Degradation of stainless steel grids in chemically aggressive environment. "Engineering Failure Analysis", 35, p.418–426	en
heal.abstract	The present study concerns the failure analysis of a perforated austenitic stainless steel grid, operating in a shell-and-tube heat exchanger of a petrochemical industry. Macroscopic examination of the grid indicated extensive friability and severe cracking in a direction perpendicular to its normal loading, while both grid surfaces as well as the interior of the filtration holes were covered significantly by decayed deposits. Microscopic examination of selected grid areas, after the surface deposits removal, indicated severe cracking exhibiting multiple branching, which advocates for stress corrosion cracking. Besides the extensive cracking areas, voids surrounded by twinning and slip bands were observed. Elemental microanalysis carried out in the areas around voids indicated the presence of iron and chromium at proportions that can be correlated to the formation of σ-phase. The detection of oxygen, iron and chromium within the cracks is attributed to corrosion products consisting of a mixture of iron and chromium oxides. The premature catastrophic failure of the stainless grid occurred as a synergistic effect of these distinct root-causes. Potential substitution of the currently used stainless steel with another alloy of higher resistance in stress corrosion cracking and microstructure stability at high temperatures is suggested.	en
heal.publisher	Elsevier	en
heal.journalName	Engineering Failure Analysis	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true