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

Claudio Ruggieri; Andrey Jivkov

doi:10.1016/j.prostr.2019.08.137

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

Claudio Ruggieri, Andrey Jivkov

Mechanical and Aeronautical Engineering Division L5

University of Sao Paulo

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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.

Original language	English
Pages (from-to)	28-35
Number of pages	8
Journal	Procedia Structural Integrity
Volume	18
Early online date	9 Sept 2019
DOIs	https://doi.org/10.1016/j.prostr.2019.08.137
Publication status	Published - 15 Sept 2019

Keywords

cleavage fracture
fracture toughness
Local approach
carbide distribution
RPV steel

Research Beacons, Institutes and Platforms

Advanced materials
Energy
Manchester Energy

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10.1016/j.prostr.2019.08.137

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A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel
Ruggieri, C. & Jivkov, A. P., 1 Sept 2022, In: Engineering Fracture Mechanics. 272, 15 p., 108702.
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Incorporation of obstacle hardening into local approach to cleavage fracture to predict temperature effects in the ductile to brittle transition regime
Yankova, M., Jivkov, A. & Patel, R., 5 Mar 2021, In: Materials. 14, 5, p. 1-12 12 p., 1224.
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Observations of cleavage initiation in ferritic steel
Ford, M., Jivkov, A. & James, P., 1 Dec 2020, In: Procedia Structural Integrity. 28, p. 1787–1794 8 p.
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Cite this

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

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 tensionC(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.",

keywords = "cleavage fracture, fracture toughness, Local approach, carbide distribution, RPV steel",

author = "Claudio Ruggieri and Andrey Jivkov",

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language = "English",

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T1 - A local approach incorporating the measured statistics of microcrack to assess the temperature dependence of cleavage fracture for a reactor pressure vessel steel

AU - Ruggieri, Claudio

AU - Jivkov, Andrey

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Y1 - 2019/9/15

N2 - 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 tensionC(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.

AB - 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 tensionC(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.

KW - cleavage fracture

KW - fracture toughness

KW - Local approach

KW - carbide distribution

KW - RPV steel

U2 - 10.1016/j.prostr.2019.08.137

DO - 10.1016/j.prostr.2019.08.137

M3 - Article

SN - 2452-3216

VL - 18

SP - 28

EP - 35

JO - Procedia Structural Integrity

JF - Procedia Structural Integrity

ER -

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

Abstract

Keywords

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Research output

A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel

Incorporation of obstacle hardening into local approach to cleavage fracture to predict temperature effects in the ductile to brittle transition regime

Observations of cleavage initiation in ferritic steel

Cite this