Microstructure and Failure Processes of Reactor Pressure Vessel Austenitic Cladding

• Published in: Metals (Basel ) Vol. 11; no. 11; p. 1676
• Main Authors: Štefan, Jan, Siegl, Jan, Adámek, Jan, Kopřiva, Radim, Falcník, Michal
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2021
• Subjects: austenitic cladding; Cladding; Compliance; Crack initiation; Crack propagation; Cracking (fracturing); Failure mechanisms; Failure modes; fractography; Fracture toughness; fracture toughness test; Heterogeneity; metallography; Microstructure; Nuclear power plants; Nuclear reactor components; nuclear reactor pressure vessel; Nuclear reactors; Pressure vessels; Sigma phase; Solidification; Stainless steel; Stainless steels; weld overlay
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met11111676

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.