Effect of the bainitic and martensitic microstructures on the hardening and embrittlement under neutron irradiation of a reactor pressure vessel steel

Marini, B.; Averty, X.; Wident, P.; Forget, P.; Barcelo, Françoise

doi:10.1016/j.jnucmat.2015.05.023

Cited by 25 publications

(18 citation statements)

References 20 publications

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“…5) Marini et al found that the yield stress of 16MND5 increased by more than 14% after irradiation, and the ultimate tensile stress increased by more than 12%. 8) In Pawel's study, the fracture toughness of various materials all decreased after irradiation to 3 dpa. 9) It was shown that the dislocation density in thin foils of RPV steel weld increased after years of neutron irradiation, 10) and Cu, Mn, Ni, and Si atoms were enriched at dislocations, 11) which resulted in Cu-, Mn-, and Ni-rich clusters and decreased the toughness.…”

Section: Introductionmentioning

confidence: 92%

Manipulating Dislocations Using Electric Field to Repair Embrittlement Damage

Zhou

Zhang

et al. 2020

ISIJ Int.

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Section: Introductionmentioning

confidence: 92%

Manipulating Dislocations Using Electric Field to Repair Embrittlement Damage

Zhou

Zhang

et al. 2020

ISIJ Int.

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“…So, to evaluate this risk, it is essential to understand formation, distribution, development of micro-cracks, which can be at the origin of the brittle fracture of the component. Moreover, the detailed information about the modifications of stress and strain distributions in each steel grain when exposed to radiation is very important and the microstructure is the key of these evolutions [2][3]. In this study, we derive this information by means of a physics-based model which includes the following elements:…”

Section: Introductionmentioning

confidence: 99%

Identification of crystal plasticity parameters for a non-irradiated and irradiated A508 bainite steel

Nguyen

Cailletaud

Barbe

et al. 2021

Metall. Res. Technol.

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This paper presents the identification of dislocation-density-based crystal plasticity parameters for a A508 Cl3 bainite steel in non-irradiated and irradiated states and at different temperatures. The representative volume element for the identification process is a cube containing 1000 steel grains represented by a Voronoi mosaic discretized by finite elements. The grains are assigned crystallographic orientations corresponding to an isotropic texture. The crystal constitutive model is based on a plastic flow law, a hardening law, and a law of evolution of dislocation densities. Modeling parameters are determined by a two-step calculation with two different crystal structures: (1) using a simple structure with 343 identical grains to identify 7 parameters, (2) using a Voronoi tessellation of 1000 grains to refine the parameters. Thereafter, the calculated stress-strain curves are compared with experimental stress-strain curves. The results show that the simulated stress-strain curves are in good agreement with those of experiments, highlighting the reliability of the proposed procedure to account for the significant effects of irradiation and temperature.

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“…Marini et al . 15 investigated the effect of bainitic and martensitic microstructures on the embrittlement of an A508 steel subjected to neutron irradiation. The results revealed that, compared with the fully bainitic microstructures, the martensitic microstructures are more susceptible to non-hardening embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on the impact toughness and temper embrittlement of SA508Gr.4N steel for advanced pressure vessel materials

Yang

Liu

et al. 2018

Sci Rep

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The effect of microstructure on the impact toughness and the temper embrittlement of a SA508Gr.4N steel was investigated. Martensitic and bainitic structures formed in this material were examined via scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and Auger electron spectroscopy (AES) analysis. The martensitic structure had a positive effect on both the strength and toughness. Compared with the bainitic structure, this structure consisted of smaller blocks and more high-angle grain boundaries (HAGBs). Changes in the ultimate tensile strength and toughness of the martensitic structure were attributed to an increase in the crack propagation path. This increase resulted from an increased number of HAGBs and refinement of the sub-structure (block). The AES results revealed that sulfur segregation is higher in the martensitic structure than in the bainitic structure. Therefore, the martensitic structure is more susceptible to temper embrittlement than the bainitic structure.Reactor pressure vessels (RPV) are generally considered to be the most critical components in the nuclear plant beside the reactor core 1,2 . The RPV should serve for 40 years under high-temperature, high-pressure, and neutron-irradiation conditions. Therefore, to ensure safe operation of the reactor, the RPV should be fabricated from material with high strength, high fracture toughness, and high resistance to irradiation embrittlement 3-5 .The RPV is typically fabricated from ASME SA508 Class 3 steel [6][7][8] . With the development of generation IV reactors, larger and higher-power nuclear power plants (compared with those housing generation III reactors) are being built. However, the low strength (620 MPa) of the SA508 Class 3 steel renders this material unsuitable for generation IV reactors and, hence, new materials must be developed. Many countries have considered SA508Gr.4N steel as a candidate material 9,10 .The RPVs are large forgings and with wall thickness of more than 200 mm 11 . Generally, the forged RPVs are quenched and tempered, as result, the through-thickness microstructure vary significantly because of the differential cooling rates during quenching. These differing microstructures will lead to heterogeneous mechanical properties along the thickness direction of the RPV. Therefore, an understanding of the microstructure and mechanical properties of RPV steels with different quenched microstructures is essential.The microstructure of the initial quenched martensite is a key factor in determining the performance of RPVs. Park et al. 12 reported that the strength of a quenched Ni-Cr-Mo low alloy steel with a fully martensitic microstructure is significantly higher than that of the quenched microstructure composed of bainite. Similarly, compared with bainite, tempered martensite is more susceptible to temper embrittlement. Raoul et al. 13 found that, in high-P (0.017%) A533 steel, P segregation in martensite is considerably higher than that in bainite. Furthermore, Lee et al. 14 dete...

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Effect of the bainitic and martensitic microstructures on the hardening and embrittlement under neutron irradiation of a reactor pressure vessel steel

Cited by 25 publications

References 20 publications

Manipulating Dislocations Using Electric Field to Repair Embrittlement Damage

Manipulating Dislocations Using Electric Field to Repair Embrittlement Damage

Identification of crystal plasticity parameters for a non-irradiated and irradiated A508 bainite steel

Effect of microstructure on the impact toughness and temper embrittlement of SA508Gr.4N steel for advanced pressure vessel materials

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