Precipitation of sigma-phase and creep-fatigue behavior of 308L steel weldment

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The creep-fatigue properties of a 308L steel weldment after different post-weld heat treatments (PWHT) are investigated. The microstructure and phase transformation of the as-welded and PWHT weldments are examined using scanning and transmission electron microscopy. Special attention is paid to the decomposition of delta-ferrite and the precipitation of sigma-phase. Energy dispersive spectroscopy is also used for detecting the elements distribution. The results show that PWHT promotes the creep-fatigue resistance of the weldment. delta-Ferrite mainly transforms into secondary austenite and sigma-phase. The decomposition ratio of delta-ferrite shows a tendency to decrease after high temperature PWHT. This can be attributed to the reduction of silicon segregation near the delta/gamma interface. (C) 2007 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2008-06
Language
English
Article Type
Article; Proceedings Paper
Keywords

AUSTENITIC STAINLESS-STEELS

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.483-84, pp.418 - 421

ISSN
0921-5093
DOI
10.1016/j.msea.2006.08.141
URI
http://hdl.handle.net/10203/86696
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