Application of advanced master curve approaches on WWER-440 reactor pressure vessel steels

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The master curve (MC) approach used to measure the transition temperature, T0, was standarised in the ASTM Standard Test Method E 1921 in 1997. The basic MC approach for analysis of fracture test results is intended for macroscopically homogeneous steels with a body centred cubic (ferritic) structure only. In reality, due to the manufacturing process, the steels in question are seldom fully macroscopically homogeneous. The fracture toughness values measured on Charpy size SE(B) specimens of base metal from the Greifswald Unit 8 rector pressure vessel (RPV) show large scatter. The basic MC evaluation following ASTM E1921 supplies a MC with many fracture toughness values which lie below the 5% fracture probability line. It is therefore suspected that this material is macroscopically inhomogeneous. In this paper, two recent extensions of the MC for inhomogeneous materials are applied to these fracture toughness data.


Original languageEnglish
Pages (from-to)584-592
JournalInternational Journal of Pressure Vessels and Piping
Issue number8
Publication statusPublished - Jul 2006


  • Reactor pressure vessel steel, Fracture toughness, Master curve approach, Inhomogeneous material, Random inhomogeneity, Maximum likelihood procedure, SINTAP procedure

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