Characterization of precipitation sequences in superaustenitic stainless steels

Koutsoukis, T; Redjaimia, A; Fourlaris, G

dc.contributor.author	Koutsoukis, T	en
dc.contributor.author	Redjaimia, A	en
dc.contributor.author	Fourlaris, G	en
dc.date.accessioned	2014-03-01T02:52:55Z
dc.date.available	2014-03-01T02:52:55Z
dc.date.issued	2011	en
dc.identifier.issn	10120394	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36149
dc.subject	Ageing	en
dc.subject	Intermetallic compounds	en
dc.subject	Orientation relationships	en
dc.subject	Phase identification	en
dc.subject	Precipitation	en
dc.subject	Superaustenitic stainless steel	en
dc.subject	TEM	en
dc.subject.other	Ageing	en
dc.subject.other	Austenitic matrix	en
dc.subject.other	Chi phase	en
dc.subject.other	Corrosion behaviour	en
dc.subject.other	Elevated temperature	en
dc.subject.other	Excellent corrosion resistances	en
dc.subject.other	Exposure temperature	en
dc.subject.other	Isothermal ageing	en
dc.subject.other	Laves-phase	en
dc.subject.other	Orientation relationship	en
dc.subject.other	Orientation relationships	en
dc.subject.other	Phase identification	en
dc.subject.other	Phase transformation	en
dc.subject.other	Precipitation sequence	en
dc.subject.other	Secondary austenite	en
dc.subject.other	Secondary phasis	en
dc.subject.other	Sigma phase	en
dc.subject.other	Superaustenitic stainless steel	en
dc.subject.other	Temperature range	en
dc.subject.other	Austenite	en
dc.subject.other	Austenitic transformations	en
dc.subject.other	Carbides	en
dc.subject.other	Characterization	en
dc.subject.other	Chlorine compounds	en
dc.subject.other	Cold rolling	en
dc.subject.other	Corrosion resistance	en
dc.subject.other	Corrosion resistant alloys	en
dc.subject.other	Intermetallics	en
dc.subject.other	Linear transformations	en
dc.subject.other	Mechanical properties	en
dc.subject.other	Nitrides	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Transmission electron microscopy	en
dc.subject.other	Stainless steel	en
dc.title	Characterization of precipitation sequences in superaustenitic stainless steels	en
heal.type	conferenceItem	en
heal.identifier.primary	10.4028/www.scientific.net/SSP.172-174.493	en
heal.identifier.secondary	http://dx.doi.org/10.4028/www.scientific.net/SSP.172-174.493	en
heal.publicationDate	2011	en
heal.abstract	Superaustenitic stainless steels exhibit excellent corrosion resistance, at a wide variety of exposure temperatures, especially in chloride containing environments, coupled with desirable mechanical properties. Previous studies have shown that these steels are prone to precipitation of secondary phases, such as sigma phase (σ), chi phase (Χ), Laves-phase, carbides, nitrides or secondary austenite, when exposed at elevated temperatures, directly affecting their mechanical properties and corrosion behaviour. A detailed study of the effect of isothermal ageing on the microstructure of S32654 (Fe-24Cr-21Ni-7Mo-0.5N-0.013C) and S31254 (Fe-20Cr-18Ni-6Mo-0.2N-0.012C) superaustenitic stainless steels was carried out. Samples were aged within the temperature range of 650 °C to 950 °C for times up to 3000 h. Following ageing, precipitation of secondary phases was clearly observed with precipitates varying in volume fraction, size, shape and spatial distribution. Several secondary phases were identified via transmission electron microscopy (TEM) and electron diffraction (ED). The orientation relationships between the austenitic matrix and the secondary phases were identified. Interaction and also phase transformation among different types of precipitates, such as between precipitates and the austenitic matrix were observed and an attempt of understanding these phase transformations was carried out. © (2011) Trans Tech Publications.	en
heal.journalName	Diffusion and Defect Data Pt.B: Solid State Phenomena	en
dc.identifier.doi	10.4028/www.scientific.net/SSP.172-174.493	en
dc.identifier.volume	172-174	en
dc.identifier.spage	493	en
dc.identifier.epage	498	en