Microstructure and Failure Processes of Reactor Pressure Vessel Austenitic Cladding
| Autor: | Jan Štefan, Jan Siegl, Radim Kopřiva, Jan Adamek, Michal Falcník |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mining engineering. Metallurgy Metals and Alloys TN1-997 Fractography Microstructure Cladding (fiber optics) fractography Pressure vessel weld overlay nuclear reactor pressure vessel fracture toughness test metallography Brittleness Fracture toughness austenitic cladding General Materials Science Composite material Failure mode and effects analysis Reactor pressure vessel |
| Zdroj: | Metals, Vol 11, Iss 1676, p 1676 (2021) Metals Volume 11 Issue 11 |
| ISSN: | 2075-4701 |
| Popis: | This paper is dedicated to an experimental program focused on the evaluation of microstructure and failure mechanisms of WWER 440 type nuclear reactor pressure vessel cladding made from Sv 08Kh19N10G2B stainless steel. Static fracture toughness tests performed on standard precracked single edge bend specimens revealed extreme variations in fracture toughness values, J0.2. Fractured halves of test specimens were subject to detailed fractographic and metallographic analyses in order to identify the causes of this behavior and to determine the relationship between local microstructure, failure mode and fracture toughness. Results indicated that fracture toughness of the cladding was adversely affected by the brittle cracking of sigma particles which caused a considerable decrease in local ductile tearing resistance. Extreme variations in relative amounts of sigma phase, as well as the extreme overall structural heterogeneity of the cladding determined in individual specimens, provided a reasonable explanation for variations in fracture toughness values. |
| Databáze: | OpenAIRE |
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