Some issues on structural integrity analysis of P91 welds in power plants subjected to high temperature creep

ABSTRACT Welds are metallurgically complex, with heterogeneous structures within the weld metal and heat‐affected zones. In order to carry out a structural integrity assessment, it is important to have knowledge of the initial metallurgical features and the associated material property variations so...

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Published in:Fatigue & fracture of engineering materials & structures Vol. 32; no. 11; pp. 926 - 935
Main Authors: HYDE, T. H., SUN, W., YAGHI, A. H., LEEN, S. B.
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01-11-2009
Blackwell
Wiley Subscription Services, Inc
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Summary:ABSTRACT Welds are metallurgically complex, with heterogeneous structures within the weld metal and heat‐affected zones. In order to carry out a structural integrity assessment, it is important to have knowledge of the initial metallurgical features and the associated material property variations so that it is possible to accurately model all the possible failure modes of welds using, for example, numerical techniques. This paper describes some fundamental issues concerning a holistic process for high temperature performance and failure prediction assessment of power plant welds. This includes welding process simulation and residual stress determination, microstructural evolution and the formulation of creep damage mechanics constitutive equations including weld metal anisotropy. Typical examples, from specific case studies for P91 welds, are used to illustrate the application. Future requirements for development of high temperature assessment methods for welds are suggested.
Bibliography:ark:/67375/WNG-RB8RJKS1-9
ArticleID:FFE1397
This paper is based on a presentation at the ESIA9 Conference in Beijing, October 2007.
istex:D89D4CA88F284D345C3DCDF7E7400038ED598535
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:8756-758X
1460-2695
DOI:10.1111/j.1460-2695.2009.01397.x