Effect of radial hydride fraction on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between ambient and 300 °C temperatures

Sharma, Rishi K.; Bind, A.K.; Avinash, G.; Singh, R.N.; Tewari, Ashish; Kashyap, B.P.

doi:10.1016/j.jnucmat.2018.06.003

Cited by 34 publications

(8 citation statements)

References 15 publications

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“…The CCL values of Zr-2.5%Nb alloy pressure tube material depends on the temperature, hydrogen content and hydride orientation [56]. The values of CCL for Zr-2.5Nb pressure tubes manufactured from quadruple melted ingots is reported to be greater than 70 mm under reactor operating condition and reduces to 50 mm for the material containing 100 wppm hydrogen with hydrides having circumferential orientation.…”

Section: Pressure Tube Failure Modementioning

confidence: 98%

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Murty

Singh

Ståhle

2019

Journal of Nuclear Materials

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In Fig. 1(a) and (b) plot of KJ as a function of aspect ratio of oxide nodules for different depths using unirradiated and irradiated material properties is shown. Also depicted in this figure are the reported values of threshold stress intensity factors above which crack growth by Delayed Hydride Cracking is possible. It is evident form figures that in cases of unirradiated material, oxide nodules having aspect ratios less than two and depths more than 350 mm can initiate DHC whereas nodules having aspect ratios less than 2.5 and depths more than 200 mm can initiate DHC in irradiated material.

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Section: Pressure Tube Failure Modementioning

confidence: 98%

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Murty

Singh

Ståhle

2019

Journal of Nuclear Materials

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“…As mentioned above, circumferential hydrides can seriously damage the mechanical properties of the matrix only at high hydrogen concentrations or with localized precipitation [ 147 ]. In particular, the fractographs of Zircaloy materials containing circumferential hydrides and radial hydrides are quite different ( Figure 12 a,b) [ 154 , 155 , 156 , 157 , 158 , 159 , 160 ]. The fracture surface displayed in Figure 12 a has a quasi-cleavage fracture of micropores, cavities, and facets [ 155 ].…”

Section: Hydride-induced Embrittlementmentioning

confidence: 99%

Mechanisms of Hydride Nucleation, Growth, Reorientation, and Embrittlement in Zirconium: A Review

Jia

Han

2023

Materials

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Zirconium (Zr) hydrides threaten the reliability of fuel assembly and have repeatedly induced failures in cladding tubes and pressure vessels. Thus, they attract a broad range of research interests. For example, delayed hydride cracking induced a severe fracture and failure in a Zircaloy-2 pressure tube in 1983, causing the emergency shutdown of the Pickering nuclear reactor. Hydride has high hardness and very low toughness, and it tends to aggregate toward cooler or tensile regions, which initiates localized hydride precipitation and results in delayed hydride cracking. Notably, hydride reorientation under tensile stress substantially decreases the fracture toughness and increases the ductile-to-brittle transition temperature of Zr alloys, which reduces the safety of the long-term storage of spent nuclear fuel. Therefore, improving our knowledge of Zr hydrides is useful for effectively controlling hydride embrittlement in fuel assembly. The aim of this review is to reorganize the mechanisms of hydride nucleation and growth behaviors, hydride reorientation under external stress, and hydride-induced embrittlement. We revisit important examples of progress of research in this field and emphasize the key future aspects of research on Zr hydrides.

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“…Hydride formation at preexisting crack tips leads to further fracture growth after a delay due to the steadily increasing presence of the formed hydrides at the crack tip. Sharma et al 15 investigated the fracture behavior of hydrided zirconium alloy tubing material using mechanical testing. They were able to change the hydride morphology by annealing a system with 100% radial hydrides.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the fracture toughness of predominantly radially hydrided material was approximately three times lower than that of the circumferentially hydrided material at room temperature. 15 . These experiments clearly indicate that microstructural characteristics, such as texture and dislocation-densities, need to be quantified to understand how they specifically affect fracture nucleation and evolution.…”

Section: Introductionmentioning

confidence: 99%

A machine learning microstructurally predictive framework for the failure of hydrided zirconium alloys

2023

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Hydride precipitation within zirconium alloys affects ductility and fracture behavior. The complex distribution of hydrides and their interaction with defects, such as dislocations, have a significant role in crack nucleation and failure. Hence, there is substantial variability in the microstructural behavior of hydrided zirconium. A deterministic fracture model coupled to a dislocation-density based crystalline plasticity approach was used to predict failure. Deterministic simulations were used to develop a database of crack initiation for representative microstructural characteristics, such as texture, crystalline structure, hydride orientations and spacing, and hydride geometry. The machine learning (ML) analysis is based on Extreme Value Theory (EVT) and a Bayesian based Gaussian Process Regression (GPR). Fracture probability is significantly influenced by hydride orientation and dislocation-density interactions. Furthermore, surrogate reduced order models (ROM) models were used to predict the likelihood of failure. This approach provides a ML framework to predict failure at different physical scales.

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Effect of radial hydride fraction on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between ambient and 300 °C temperatures

Cited by 34 publications

References 15 publications

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Mechanisms of Hydride Nucleation, Growth, Reorientation, and Embrittlement in Zirconium: A Review

A machine learning microstructurally predictive framework for the failure of hydrided zirconium alloys

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Effect of radial hydride fraction on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between ambient and 300 °C temperatures

Cited by 34 publications

References 15 publications

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

Mechanisms of Hydride Nucleation, Growth, Reorientation, and Embrittlement in Zirconium: A Review

A machine learning microstructurally predictive framework for the failure of hydrided zirconium alloys

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Product

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Effect of radial hydride fraction on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between ambient and 300 °C temperatures