A local approach incorporating the measured statistics of microcrack to assess the temperature dependence of cleavage fracture for a reactor pressure vessel steel

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Abstract

This work describes a local approach to cleavage fracture (LAF) incorporating the statistics of microcracks to characterize the cleavage fracture toughness distribution in structural steels. Fracture toughness testing conducted on standard compact tension
C(T) specimens for a 22NiMoCr37 pressure vessel steel provides the cleavage fracture resistance data needed to determine the measured toughness distribution. Metallographic examination of etched surfaces for the tested steel also provides the distribution of carbides, which are assumed as the Griffith fracture-initiating particles, dispersed in the material from which the cleavage fracture toughness distribution is predicted. Overall, the analyses conducted in the present work show that LAFs incorporating the statistics of microcracks are a viable engineering procedure to describe the dependence of fracture toughness on temperature in the DBT region for ferritic steels.

Bibliographical metadata

Original languageEnglish
Pages (from-to)28-35
Number of pages8
JournalProcedia Structural Integrity
Volume18
Early online date9 Sep 2019
DOIs
Publication statusPublished - 15 Sep 2019

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