Failure behaviour of cladding made from Sv 07Kh25N13 austenitic stainless steel

0536631 - ÚT 2022 RIV GB eng J - Journal Article
Štefan, Jan - Siegl, J. - Adámek, J. - Kopřiva, R. - Kytka, M.
Failure behaviour of cladding made from Sv 07Kh25N13 austenitic stainless steel.
International Journal of Pressure Vessels and Piping. Roč. 189, February (2021), č. článku 104275. ISSN 0308-0161. E-ISSN 1879-3541
R&D Projects: GA MŠMT(CZ) EF15_003/0000493
Institutional support: RVO:61388998
Keywords : nuclear reactor pressure vessel * austenitic cladding * fracture toughness testing * fractography * metallography
OECD category: Applied mechanics
Impact factor: 2.560, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0308016120302507

Sv 07Kh25N13 is austenitic stainless steel used in nuclear industry. Due to its excellent corrosion resistance in the environment of WWER type nuclear reactor primary circuit, it is applied as anticorrosive cladding of the reactor pressure vessel. In this paper, results of detailed experimental research of failure behaviour of the cladding are presented. Static fracture toughness values J0.2 exhibited an extreme scatter. Metallographic analysis performed on the fractured specimens revealed large variations of structure within every single cladding layer. Fractographic analysis performed on fracture surfaces revealed considerable variations of micromechanisms taking place during ductile crack propagation. Conclusions on the relationship between the local microstructure, the failure mode and the fracture toughness of the cladding were drawn. Results indicate that the fracture toughness of the cladding was primarily determined by local amount of sigma phase in the area of crack propagation.
Permanent Link: http://hdl.handle.net/11104/0319564