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Experimental and numerical investigation of sub-clad and surface cracks in cladded components

 
: Hohe, J.; Brand, M.; Siegele, D.

Rodery, C.D. ; American Society of Mechanical Engineers -ASME-, Pressure Vessels and Piping Division:
ASME Pressure Vessels and Piping Conference 2008. Proceedings. Vol.3: Design and analysis : Presented at 2008 ASME Pressure Vessels and Piping Conference, July 27 - 31, 2008, Chicago, Illinois, USA
New York/NY.: ASME, 2009
ISBN: 978-0-7918-4826-5
S.267-272
Pressure Vessels and Piping Conference <2008, Chicago/Ill.>
Englisch
Konferenzbeitrag
Fraunhofer IWM ()
residual stress; surface crack; austenitic cladding; sub-clad

Abstract
The present study is concerned with the fracture behavior of sub-clad and surface cracks in components consisting of ferritic steels with an austenitic welded cladding. For this purpose, two tests on large scale specimens have been performed. The residual stress field has been determined by means of a numerical simulation of the welding and heat treatment processes. Based on the results, a numerical simulation of the component tests was performed in order to enable a fracture mechanics assessment of the conditions leading to crack initiation and arrest in the ferritic and austenitic regions. It was observed that in the present tests failure was initiated in the ferritic material whereas the austenitic cladding remained stable even in the case of a limited crack extension in the ferritic ba se metal.

: http://publica.fraunhofer.de/dokumente/N-89660.html