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The evolution of primary and secondary niobium carbonitrides in AISI 347 stainless steel during manufacturing and long-term ageing
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2006 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 54, no 1, 67-76 p.Article in journal (Refereed) Published
Abstract [en]

Nb(C,N) precipitates were studied in a niobium-stabilised stainless steel (AISI 347) statically aged at 700 degrees C. Scanning electron microscopy and energy filtered transmission electron microscopy were used to determine the volume fraction and precipitate size of primary and secondary Nb(C,N) after ageing times between 0 and 70,000 h. The experimental data were correlated with simulations of Nb(C,N) formation based on the assumption that the process is controlled by diffusion. These simulations provide a rationale for the existence of two sets of mobium carbonitrides in commercial tubes of AISI 347. Growth of primary Nb(C,N) occurred essentially during manufacturing, with no significant growth at 700 degrees C. Rapid dissolution and re-precipitation of secondary Nb(C,N) occurred during manufacturing. Coarsening at 700 degrees C of secondary particles was modelled using the Lifshitz-Slyozov-Wagner theory, which overestimated the coarsening rate. These problems were overcome with a model developed by the authors. This model takes both growth and coarsening into account.

Place, publisher, year, edition, pages
2006. Vol. 54, no 1, 67-76 p.
Keyword [en]
AISI 316 stainless steel, niobium carbonitrides, growth, coarsening, long-term ageing, precipitation
URN: urn:nbn:se:kth:diva-15350DOI: 10.1016/j.actamat.2005.08.028ISI: 000233784500007ScopusID: 2-s2.0-27744587337OAI: diva2:333391
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Ågren, John
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Physical Metallurgy
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