Title
<tex>$Fe_{3}Nb_{3}N$</tex> precipitates of the <tex>$Fe_{3}W_{3}C$</tex> type in Nb stabilized ferritic stainless steel
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Chemistry
Source (journal)
Journal of alloys and compounds. - Amsterdam
Volume/pages
509(2011) :40 , p. 9583-9588
ISSN
0925-8388
ISI
000294458100004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A Nb stabilized ferritic stainless steel with 0.45 wt.%Nb, 82 ppm C and 170 ppm N is investigated to reveal the nature of the precipitates present at 950 °C. In particular, Fe3Nb3X precipitates of the Fe3W3C type are analyzed with WDS and EELS to determine the light elements X stabilizing this phase in the steel. According to WDS on large precipitates after 500 h at 950 °C, the Fe3Nb3X phase contains 10.4 at.% N, 1.2 at.% O and 1.0 at.% C. Auger Electron Spectroscopy on the same precipitates confirms the presence of N. In addition, it is revealed that the C and O peaks observed with WDS result from surface contamination as they disappear after Ar sputtering. The presence of a N peak in the EELS spectra of small Fe3Nb3X precipitates which have formed after 6 min at 950 °C indicate that N stabilizes this phase already from the initial precipitation stage. With this analysis it is demonstrated that N is an effective stabilizer of Fe3Nb3X precipitates in ferritic stainless steels. The formation of this phase should therefore be considered when predicting the precipitation behavior of Nb in industrial Nb stabilized ferritic stainless steels containing residual N.
E-info
https://repository.uantwerpen.be/docman/iruaauth/a4f5a8/50c8583ddff.pdf
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