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Orientation relationships of intragranular austenite in duplex stainless steel weld metals
University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering. (PTW)ORCID iD: 0000-0001-8822-2705
ESAB AB, PO Box 8004, Göteborg.
2014 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 19, no 4, 318-323 p.Article in journal (Refereed) Published
Abstract [en]

Formation and characteristics of fine intragranular austenite were studied for low energy input duplex stainless steel welds. Microstructures were largely ferritic with some allotriomorphic grain boundary austenite, Widmanstätten type austenite, fine intragranular austenite and nitrides. Electron backscattered diffraction analysis revealed that grain boundary austenite had a random orientation relationship (OR) with one of the adjacent ferrite grains and was close to Kurdjumov-Sachs (KS) with the other, whereas Widmanstätten austenite always showed an OR near KS. The finest intragranular austenite was mainly randomly oriented, whereas coarser austenite more often was close to KS. It is argued that the OR of intragranular austenite with the ferritic matrix is governed by a combination of composition, determining driving force for nucleation at temperature, cooling rate and the availability of nitrides acting as nucleation sites. A random OR is most likely for higher cooling rates and compositions promoting nucleation at lower temperatures. © 2014 Institute of Materials, Minerals and Mining.

Place, publisher, year, edition, pages
2014. Vol. 19, no 4, 318-323 p.
Keyword [en]
Cooling, Ferrite, Grain boundaries, Nitrides, Nucleation, Stainless steel, Duplex stainless steel, EBSD, Orientation relationship, References, Weld metal
National Category
Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6226DOI: 10.1179/1362171813Y.0000000192ISI: 000337135100005Scopus ID: 2-s2.0-84897456345OAI: oai:DiVA.org:hv-6226DiVA: diva2:716150
Available from: 2014-05-08 Created: 2014-05-08 Last updated: 2016-02-10Bibliographically approved

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