Mechanical Properties Degradation at Room Temperature in ZRY-4 by Hydrogen Brittleness

Bertolino, G.; Meyer, G.; Ipiña, Juan E. Perez

doi:10.1590/s1516-14392002000200007

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…This is a very powerful toughening mechanism, because the fracture toughness of the zirconium matrix can be as high as 58-70 MPa m 1/2 (52?8-63?7 ksi in. 1/2 ), [76][77][78][79][80] compared to a K IC close to 1 MPa m 1/2 (0?91 ksi in. 1/2 ) for the hydrides.…”

Section: Ligament Toughening By Zirconium Grainsmentioning

confidence: 93%

An assessment of delayed hydride cracking in zirconium alloy cladding tubes under stress transients

Chan

2013

International Materials Reviews

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Zirconium alloy cladding tubes used in nuclear fuel rods are susceptible to delayed hydride cracking, which is a time dependent crack growth process resulting from the stress assisted diffusion of hydrogen to the crack tip, followed by the formation of radial hydrides and the subsequent fracture of the hydrides in the crack tip region. This article reviews the current understanding of the delayed hydride cracking behaviour of zirconium alloy cladding tubes for fuel rods, focusing on the degradation mechanisms in high burnup fuel rods and transient loading scenarios, which could potentially lead to substantial changes in the hydride microstructure and cladding failure by delayed hydride cracking following removal from the reactor and during storage and disposal of spent nuclear fuel rods in a waste repository. A brief summary of the general characteristics of delayed hydride cracking in zirconium alloy cladding is presented first. Relevant information on the cladding stresses under various usage conditions is then compiled and categorised into several characteristic stress transients that can be anticipated during reactor operation. Delayed hydride cracking in cladding tubes under stress transients is then examined under various temperatures, cooling rates, burnup levels and loading conditions.

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Section: Ligament Toughening By Zirconium Grainsmentioning

confidence: 93%

An assessment of delayed hydride cracking in zirconium alloy cladding tubes under stress transients

Chan

2013

International Materials Reviews

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“…Such a woven fabric composite can be approximated as an orthotropic material with weak anisotropy. T,X 365 [39], 80 [38] 460 [39], 468 [38] 522 [39], 541 [38] 510 [39], 515 [38] 1162-0.5437 l+exp[0.008025(T-861.7)] (MPa)…”

Section: Sicjvsic Compositesmentioning

confidence: 99%

Stress Analysis and Structural Optimization of a Three-Layer Composite Cladding Tube Under Thermo-Mechanical Loads

Zhou

Gao

Griffith

2012

Journal of Engineering Materials and Technology

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A general solution for the stress and strain fields in a three-layer composite tube subjected to internal and external pressures and temperature changes is first derived using thermo-elasticity. The material in each layer is treated as orthotropic, and the composite tube is regarded to be in a generalized plane strain state. A three-layer ZRY4-SiC/SiC-SIC composite cladding tube under a combined pressure and thermal loading is then analyzed and optimized by applying the general solution. The effects of temperature changes, applied pressures, and layer thickness on the mechanical behavior of the tube are quantitatively studied. The von Mises' failure criterion for Isotropie materials and the Tsai-Wu's failure theory for composites are used, respectively, to predict the failure behavior of the monolithic ZRY4 (i.e., Zircaloy-4) inner layer and SiC outer layer and the composite SiCjISiC core layer of the three-layer tube. The numerical results reveal that the maximum radial and circumferential stresses in each layer always occur on the bonding surfaces. By adjusting the thickness of each layer, the effective stress in the three-layer cladding tube under the prescribed thermal-mechanical loading can be changed, thereby making it possible to optimally design the cladding e.

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“…As hydrides are brittle, their formation in zirconium alloy do degrade its mechanical properties. The presence of hydrides reduces ductility and resistance to brittle fracture [1][2][3][4]. Therefore, knowing of mechanical properties under different levels of hydrogen concentration in zirconium alloy is important.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of mechanical properties of zirconium alloy with hydrides using finite element method

Janulionis¹,

Dundulis²,

Kriūkienė³

et al. 2018

energetika

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During nuclear power plant (NPP) operation, degradation effects like ageing, corrosion, fatigue, and others may significantly impact component integrity. One of the degradation mechanisms is hydrogen absorption. High levels of hydrogen in zirconium alloys can lead to the formation of zirconium hydrides and that can influence material properties. Therefore, determination of material properties under different levels of hydrogen concentration in zirconium alloys is important. It is not always possible to conduct an experimental testing. Therefore, there is a need for alternative methods for determination of material properties. This article presents the numerical prediction of material properties of zirconium 2.5% niobium alloy with hydrides.According to the objective of the work, numerical prediction was performed using the finite element (FE) method. This was done by creating a finite element model of zirconium hydride embedded in zirconium alloy. The geometry and size of hydride were measured from a real specimen. The size of zirconium alloy surrounding the hydride was selected in such a way that hydride volume part in the model would match experimental measurements. The prognosis results were compared with the experimental data.

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Mechanical Properties Degradation at Room Temperature in ZRY-4 by Hydrogen Brittleness

Cited by 8 publications

References 2 publications

An assessment of delayed hydride cracking in zirconium alloy cladding tubes under stress transients

An assessment of delayed hydride cracking in zirconium alloy cladding tubes under stress transients

Stress Analysis and Structural Optimization of a Three-Layer Composite Cladding Tube Under Thermo-Mechanical Loads

Numerical prediction of mechanical properties of zirconium alloy with hydrides using finite element method

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