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A new methodology for nitride characterisation in stainless steels, and its application on duplex 2205 and superduplex 2507
RISE, Swerea, Swerea KIMAB.
2012 (English)Report (Refereed)
Abstract [en]

Duplex and superduplex stainless steel, 2205 and 2507, have been examined with the aim of finding a methodology for nitride characterisation. LOM, SEM/STEM (SED, BSED, TED) and TEM (STEM) were used extensively for microscopy investigations to characterise microstructures and nitride contents. 2507 was heat treated for 10 minutes at 1050°C, 1100°C, 1150°C and also one longer heat treatment for 7 days at 1100°C. This longer treatment also included 2205. The purpose of the 7 days heat treatment was to achieve a larger austenite spacing and thus higher probability for nitride precipitation. Hexagonal chromium nitrides, Cr2N, were found in all specimens. Higher heat treatment temperatures and longer heat treatment times gave larger areas of ferrite and consequently more nitrides. The nitrides were needle shaped and seemed to be constituted as a mixture of two populations, one with larger and one with smaller nitrides. The nitride precipitates were found in the centre of the ferrite grains and they seem to form with a certain orientation relation towards the ferrite matrix.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2012. , 50 p.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2011-108
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13007OAI: oai:DiVA.org:ri-13007DiVA: diva2:973201
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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