Short review: Potential impact of delamination cracks on fracture toughness of structural materials
The current energy policy envisages extended lifetime for the current nuclear power plants (GEN II NPP). This policy imposes a large research effort to understand the ageing of power plant components. In this goal, it is necessary to improve knowledge about safety, reliability and components’ inte...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-02-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero35/numero_35_art_57.pdf |
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| Summary: | The current energy policy envisages extended lifetime for the current nuclear power plants (GEN
II NPP). This policy imposes a large research effort to understand the ageing of power plant components. In
this goal, it is necessary to improve knowledge about safety, reliability and components’ integrity for more than
forty years of operation. In Central and Eastern Europe, the majority of NPPs are VVER types, where some of
the components are produced from austenitic steel 08Ch18N10T. Irradiated 08Ch18N10T may exhibit brittle
behavior, namely delamination cracks are found in some cases on the fracture surface of irradiated
08Ch18N10T with elongated δ-ferrite. Delamination cracks have also been observed on the fracture surface of
high-strength steels or aluminum-lithium alloys. This article presents a state-of-the art review to provide a
detailed analysis of the influence of delamination cracks on the toughness of metal alloys. In general, the
delamination cracks are present in metal alloys having a high texture and microstructure anisotropy. Three types
of delamination cracks have been observed and are classified as crack arrester delamination, crack divider
delamination and crack splitting delamination. The microscopy characterization, 3D fracture theories and
computational studies explaining possible causes and effects of delamination cracks on the mechanical
properties of metal alloys are presented. |
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| ISSN: | 1971-8993 1971-8993 |