Local approach to fracture based prediction of the ΔT56J and shifts due to irradiation for an A508 pressure vessel steel

Tanguy, B.; Bouchet, Charlotte; Bugat, Stéphane; Besson, Jacques

doi:10.1016/j.engfracmech.2005.05.006

Cited by 34 publications

(34 citation statements)

References 49 publications

(70 reference statements)

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“…It predicts also that an increase of the yield strength (produced for instance by neutron irradiation or an increase in strain rate) leads to a reduction of the fracture toughness, K IC , for a given test temperature and a given specimen thickness. It has been shown that this prediction is in good agreement with experimental results (see Tanguy et al 2006;Pineau and Pardoen 2007).…”

Section: Figsupporting

confidence: 75%

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Pineau

2008

Int J Fract

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Both scientists and engineers are very much concerned with the study of ductileto-brittle transition (DBT) in ferritic steels. For historical reasons the Charpy impact test remains widely used in the industry as a quality control tool to determine the DBT temperature. The transition between the two failure modes, i.e. brittle cleavage at low temperature and ductile fracture at the upper shelf occurs also at low loading rate in fracture toughness tests. Recent developments have been made in the understanding of the micromechanisms controlling either cleavage fracture in BCC metals or ductile rupture by cavity nucleation, growth and coalescence. Other developments have also been made in numerical tools such as the finite element (FE) method incorporating sophisticated constitutive equations and damage laws to simulate ductile crack growth (DCG) and cleavage fracture. Both types of development have thus largely contributed to modeling DBT occurring either in impact tests or in fracture toughness tests. This constitutes the basis of a modern methodology to investigate fracture, which is the so-called local approach to fracture. In this study the micromechanisms of brittle cleavage fracture and ductile rupture are firstly shortly reviewed. Then the transition between both modes of failure is investigated. It is shown that the DBT behavior observed in impact tests or in fracture toughness specimens can be reasonably well predicted using modern theories on brittle and ductile fracture in conjunction with FE numerical simulations. The review includes a detailed study of a number of metallurgical parameters contributing to the variation of the DBT temperature. Two main types of steels are considered : (i) quenched and tempered bainitic and martensitic steels used in the fabrication of pressurized water reactors, and (ii) modern high-toughness line-pipe steels obtained by chemical variations and optimized hot-rolling conditions. An attempt is also made to underline the research areas which remain to be explored for improving the strength-toughness compromise in the development of steels.

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Section: Figsupporting

confidence: 75%

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Pineau

2008

Int J Fract

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“…According to previous studies [35,39], Young's modulus E and Poisson's ration m were assumed to be independent of temperature and irradiation, and equal to 200 GPa and 0.3, respectively. Viscous parameters fk 1 ; n 1 g and fk 2 ; n 2 g aim at reproducing strain rate effects for both low and high strain rate, respectively.…”

Section: Identification Of the Constitutive Lawmentioning

confidence: 99%

“…Considering the thermomechanical history encountered in WPS cycles, an adaptation of the original model to account for the temperature dependence of the model parameters proposed in [39] will be used in this study. The rupture probability of a volume element is then no longer represented by r Ip but by x ¼ ðr Ip =r u Þ m where both r u and m may be temperature dependent.…”

Section: Cleavage Fracture Modelmentioning

confidence: 99%

Warm PreStress effect on highly irradiated reactor pressure vessel steel

Hure

Vaille

Wident

et al. 2015

Journal of Nuclear Materials

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“…In conclusion, non-metallic inclusions, second-phase particles, and grain boundaries are considered to be the best candidate sites for void nucleation and ductile failure. Tanguy et al (2006) have also reported that the presence of second-phase particles, such as lamellar cementite or martensite, are a source of void nucleation. Chen et al (2002) showed that lamellar cementite has a delayed deformation rate as compared to ferrite.…”

Section: Void Nucleation Mechanism At the Grain Boundaries And The Sementioning

confidence: 94%

Internal ductile failure mechanisms in steel cold heading process

Sabih

Nemes

2009

Journal of Materials Processing Technology

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Local approach to fracture based prediction of the ΔT56J and shifts due to irradiation for an A508 pressure vessel steel

Abstract: Local approach to fracture based prediction of the ∆T56J and ∆TKIc 100 shifts due to irradiation for an A508 pressure vessel steel. Engineering Fracture Mechanics, Elsevier, 2006, 73, pp.

Cited by 34 publications

References 49 publications

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Warm PreStress effect on highly irradiated reactor pressure vessel steel

Internal ductile failure mechanisms in steel cold heading process

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