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Formation of Chromium Nitride and Intragranular Austenite in a Super Duplex Stainless Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Swerim AB, Isafjordsgatan 28A, S-16440 Stockholm, Sweden.ORCID iD: 0000-0001-5040-2399
Swerim AB, Isafjordsgatan 28A, S-16440 Stockholm, Sweden..
Swerim AB, Isafjordsgatan 28A, S-16440 Stockholm, Sweden..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-7656-9733
2019 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 50, no 12, p. 5594-5601Article in journal (Refereed) Published
Abstract [en]

Precipitation of chromium nitrides and formation of intragranular austenite were studied in detail for the super duplex stainless steel grade 2507 (UNS S32750). The situation of multipass welding was simulated by heat treatment at 1623 K (1350 degrees C) and quenching followed by short heat treatments at 1173 K (900 degrees C). The microstructural evolution was characterized using transmission and scanning electron microscopy, electron backscatter, and transmission Kikuchi diffraction, and it was observed that the interior of the ferrite grains contained chromium nitrides after quenching. The nitrides were predominantly of CrN with a cubic halite-type structure and clusters of CrN-Cr2N where rod-shaped trigonal Cr2N particles had nucleated on plates of CrN. After heat treatment for 10 seconds at 1173 K (900 degrees C), the nitride morphology was transformed into predominantly rod-shaped Cr2N, and finely dispersed intragranular secondary austenite idiomorphs had formed in the nitride-containing areas within the ferrite grains. After 60 seconds of heat treatment, both the Cr2N nitrides and the secondary austenite were coarsened. Analysis of electron diffraction data revealed an inherited crystallographic relationship between the metastable CrN and the intragranular austenite. The mechanism of chromium nitride formation and its relation to secondary austenite formation in duplex stainless steels are discussed.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 50, no 12, p. 5594-5601
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-263672DOI: 10.1007/s11661-019-05489-2ISI: 000492465700013Scopus ID: 2-s2.0-85074296846OAI: oai:DiVA.org:kth-263672DiVA, id: diva2:1368730
Note

QC 20191108

Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-12-20Bibliographically approved

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Holländer Pettersson, NiklasBorgenstam, Annika

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