Experimental investigation of the behavior and the low cycle fatigue life of a welded structure

Strain controlled low cycle fatigue tests are performed at 300°C under tension compression on an 18%Cr ferritic stainless steel using base metal and welded specimens. Changes in the microstructure and geometry of the weld bead have a negative impact on the specimens’ lifetime. Digital image correlat...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-02, Vol.595, p.64-76
Main Authors: Benoit, A., Rémy, L., Köster, A., Maitournam, H., Oger, F.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Elasticity and anelasticity
Elasticity. Plasticity
Engineering Sciences
Exact sciences and technology
Fatigue
Ferritic stainless steel
Fractures
Lifetime model
Low cycle fatigue
Materials
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
Welded structure
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Summary:Strain controlled low cycle fatigue tests are performed at 300°C under tension compression on an 18%Cr ferritic stainless steel using base metal and welded specimens. Changes in the microstructure and geometry of the weld bead have a negative impact on the specimens’ lifetime. Digital image correlation is used to get information on strain gradient in specimens. Potential drop measurements as metallographic observations are used to monitor micro-cracking. The significance of the results is discussed using finite element computations of welded specimens and observations of fracture surfaces. A tentative rationale is proposed using an energy based micro-crack growth model.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.11.082