Intergranular stress distributions in polycrystalline aggregates of irradiated stainless steel

Hure, Jérémy; Shawish, S. El; Cizelj, Leon; Tanguy, B.

doi:10.1016/j.jnucmat.2016.04.017

Cited by 49 publications

(46 citation statements)

References 28 publications

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“…Finite strain FCC crystal plasticity constitutive equations derived and calibrated for austenitic stainless steels are used. Details about the equations as well as finite strain framework, numerical implementation and parameters can be found in [43]. Simulations are performed with AMITEX FFTP solver which is based on the Fast Fourier Transform method [44].…”

Section: Numerical Simulations: Polycrystalline Aggregatementioning

confidence: 99%

“…• Surface tension γ at the void/matrix interface, and crystal plasticity constitutive equations for the matrix [43] Surface tension is assumed to be constant and independent of the interface orientation. The parameters of the crystal plasticity constitutive equations should be calibrated for the irradiated matrix material.…”

Section: Numerical Simulations: Surface Tensionmentioning

confidence: 99%

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Assessing size effects on the deformation of nanovoids in metallic materials

2020

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An experimental methodology is developed to evaluate size effects in nanovoids deformation under macroscopic uniaxial stress loading conditions. Quantitative evaluation of voids deformation as a function of voids size shows both a crystallographic effect, albeit small compared to the scatter, and no evidence of size effects for voids diameter larger than 10nm, while a slight effect is present for smaller voids. Critical assessment of the data in light of theoretical models indicates that these results may be compatible with the presence of a hardened layer at the void/matrix interface, which is illustrated through finite element simulations accounting for surface tension.

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Section: Numerical Simulations: Polycrystalline Aggregatementioning

confidence: 99%

Section: Numerical Simulations: Surface Tensionmentioning

confidence: 99%

Assessing size effects on the deformation of nanovoids in metallic materials

2020

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“…Constitutive equations have been implemented in the MFront code generator [74], using a implicit discretization solved with a Newton-Raphson algorithm. Details of the numerical implementation can be found in [75]. Young's modulus and Poisson ratio have been set arbitrarily to Y = 200GPa and ν = 0.3.…”

Section: Numerical Limit-analysismentioning

confidence: 99%

A coalescence criterion for porous single crystals

Hure¹

2019

Journal of the Mechanics and Physics of Solids

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Voids can be observed at various scales in ductile materials, frequently of sizes lower than the grain size, leading to porous single crystals materials. Two local deformation modes of porous ductile (single crystals) materials have been identified and referred to as void growth and void coalescence, the latter being characterized by strong interactions between neighboring voids. A simple semi-analytical coalescence criterion for porous single crystals with periodic arrangement of voids is proposed using effective isotropic yield stresses associated with a criterion derived for isotropic materials. An extension of the coalescence criterion is also proposed to account for shear with respect to the coalescence plane. Effective yield stresses are defined using Taylor theory of single crystal deformation, and rely ultimately on the computation of average Taylor factors. Arbitrary sets of slip systems can be considered. The coalescence criterion is assessed through comparisons to numerical limit-analysis results performed using a Fast-Fourier-Transform based solver. A good agreement is observed between the proposed criterion and numerical results for various configurations including different sets of slip systems (Face-Centered-Cubic, Hexagonal-Close-Packed), crystal orientations, void shapes and loading conditions. The competition between void growth and void coalescence is described for specific conditions, emphasizing the strong influence of both crystal orientation and void lattice, as well as their interactions.

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“…The chemical composition and the presence of carbides in the GB was likely decisive, but further observation and analyses are necessary for predictive models. In parallel, GB cohesive strength (intergranular normal stress) lower than 100 MPa (lower than the yield strength) resulted from recent modeling of the IG fracture process in the irradiated steels and the value was decreasing with increasing dose [52], suggesting a tendency of decohesion.…”

Section: Type 1-brittle Intergranular Fracturementioning

confidence: 99%

Overview of Intergranular Fracture of Neutron Irradiated Austenitic Stainless Steels

Hojná

2017

Metals

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Austenitic stainless steels are normally ductile and exhibit deep dimples on fracture surfaces. These steels can, however, exhibit brittle intergranular fracture under some circumstances. The occurrence of intergranular fracture in the irradiated steels is briefly reviewed based on limited literature data. The data are sorted according to the irradiation temperature. Intergranular fracture may occur in association with a high irradiation temperature and void swelling. At low irradiation temperature, the steels can exhibit intergranular fracture at low or even at room temperatures during loading in air and in high temperature water (~300 • C). This paper deals with the similarities and differences for IG fractures and discusses the mechanisms involved. The intergranular fracture occurrence at low temperatures might be correlated with decohesion or twinning and strain martensite transformation in local narrow areas around grain boundaries. The possibility of a ductile-to-brittle transition is also discussed. In case of void swelling higher than 3%, quasi-cleavage at low temperature might be expected as a consequence of ductile-to-brittle fracture changes with temperature. Any existence of the change in fracture behavior in the steels of present thermal reactor internals with increasing irradiation dose should be clearly proven or disproven. Further studies to clarify the mechanism are recommended.

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Intergranular stress distributions in polycrystalline aggregates of irradiated stainless steel

Cited by 49 publications

References 28 publications

Assessing size effects on the deformation of nanovoids in metallic materials

Assessing size effects on the deformation of nanovoids in metallic materials

A coalescence criterion for porous single crystals

Overview of Intergranular Fracture of Neutron Irradiated Austenitic Stainless Steels

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