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Precipitation reactions caused by nitrogen uptake during service at high temperatures of a niobium stabilised austenitic steel
KTH, Superseded Departments, Materials Science and Engineering.
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2004 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 52, no 14, 4337-4350 p.Article in journal (Refereed) Published
Abstract [en]

Precipitation phenomena in type 347 austenitic stainless steels have been investigated after long-term heat treatment and creep in air at 700 and 800 degreesC. Nitrogen uptake was observed during long-term creep testing at 800 degreesC. No such effect was observed at 700 degreesC although times up to about 70,000 h were used. The major phases precipitated after long time exposure at 800 degreesC were primary Nb(C,N), Z-phase, Cr2N and M23C6, while primary Nb(C,N), secondary Nb(C,N) and sigma-phase were the major phases at 700 degreesC. Z-phase precipitated in both intragranular and intergranular form at 800 degreesC. Large precipitates exhibiting a core/rim structure showed a rim of Z-phase surrounding undissolved primary Nb(C,N). The microstructural evolution during creep deformation in air at 800 degreesC was modelled thermodynamically. The model satisfactorily predicts nitrogen uptake and the essential features of the evolution of the microstructure with time. The precipitation sequence could be qualitatively described, although it was not possible to model the formation of all precipitates.

Place, publisher, year, edition, pages
2004. Vol. 52, no 14, 4337-4350 p.
Keyword [en]
transmission electron microscopy, electron probe microanalysis, atom probe field ion microscopy, CALPHAD, Z-phase, stainless-steels, phase, instabilities
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-23657DOI: 10.1016/j.actamat.2004.06.001ISI: 000223389800025ScopusID: 2-s2.0-3242681516OAI: diva2:342356
QC 20100525 QC 20110923Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-23Bibliographically approved

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