Microstructural transformations of heat affected zones in duplex steel welded joints
- Szczecin Unversity of Technology, Institute of Materials Science and Engineering, Al. Piastow 19, 70-310 Szczecin (Poland)
The influence of the welding thermal conditions exemplified by heat input and heat treatment after welding on the structure of the heat affected zone (HAZ) UNS S31803 has been analysed. The post weld treatment was used to create the precisely defined thermal conditions for the decomposition of primary phases in the HAZ, by a multi-layer welding thermal cycle stimulation. Detailed analyses of the microstructure and chemical composition of the phases in the different post welded conditions were performed by scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDS) and transmission electron microscopy (TEM). Three types of secondary precipitates have been observed: secondary austenite ({gamma}{sub 2}), carbides: M{sub 23}C{sub 6} and M{sub 7}C{sub 3}. The dependence of the secondary austenite volume fraction and morphology in the HAZ on thermal cycle have been interpreted. The eutectoid decomposition of the primary phases in the analysed thermal conditions was confirmed.
- OSTI ID:
- 20889832
- Journal Information:
- Materials Characterization, Vol. 56, Issue 4-5; Conference: 9th ECSIA and 7th STERMAT: Stereology and image analysis in materials science, Zakopane (Poland), 10-13 May 2005; Other Information: DOI: 10.1016/j.matchar.2006.02.007; PII: S1044-5803(06)00066-0; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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