Digitale Medien
s.l. ; Stafa-Zurich, Switzerland
Materials science forum
Vol. 595-598 (Sept. 2008), p. 763-768
ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
The high temperature corrosion behavior of Fe20Cr6Al-Y,Hf steel was studied in therange of temperature 800-1000oC in H2/H2S atmospheres at pS2=10-2,10-3 and 10-4 Pa sulphur vaporpressures. Kinetics depend on the temperature and sulphur vapor pressure. After 24 hours the wholespecimen was practically consumed because the samples were 0,06 cm thick. Morphology of thescales have been performed by SEM techniques. Phase and chemical composition have been studiedby EDX and XRD techniques. It was found that scale formed on Fe20Cr6Al-Y,Hf alloy was builtwith porosity sulphides layer. EDX analysis of the scale surface show that the any aluminum,hafnium and yttrium sulfides were found in the formed scale layer, however small amounts of Al2S3was detected in scale/steel interface. Also internal sulphidation was observed. A phase analysis ofthe formed scale revealed that it is composed mainly of an FeS, Fe7S8 phases and CrS, Cr5S6. Resultwere compared with data obtained on the pure Fe and Cr samples
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.595-598.763.pdf
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