Effect of Stress on Hydride Precipitation Behavior in Zircaloy-2

Maki, Hideo

doi:10.3327/jnst.10.470

Cited by 2 publications

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“…In addition to the effect of thermal cycling [27][28][29], Hong and Lee [4] and Chen et al [30] have concluded that the formation of radial hydrides was also a time-dependent process because an increase in annealing time also raised the amount of radial hydrides in an isothermal heat treatment. In order to compare the difference between isothermal annealing and thermal cycling heat treatments, a cladding tube of 320 ppm H were solution treated at 400°C for 24 h for one cycle.…”

Section: Comparison Between Thermal Cycling and Isothermal Treatmentmentioning

confidence: 99%

Hydride reorientation in Zircaloy-4 cladding

Chu

Kuo

2008

Journal of Nuclear Materials

106

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Section: Comparison Between Thermal Cycling and Isothermal Treatmentmentioning

confidence: 99%

Hydride reorientation in Zircaloy-4 cladding

Chu

Kuo

2008

Journal of Nuclear Materials

106

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“…Assuming that hydrogen diffuses along a stress gradient at a given temperature, it becomes possible to explain the behavior observed on hydride platelets in zircaloy of tending to orient themselves perpendicularly to the tensile and parallel to the compressive stress axes. Maki (14) has observed that the hydride precipitated preferentially in the zones subjected to large residual tensile stress. As referred to in Chap.…”

Section: Effects Of Stressmentioning

confidence: 99%

Thermal Diffusion of Hydrogen in Zircaloy-2 Containing Hydrogen beyond Terminal Solid Solubility

Maki

Satô

1975

J. Nucl. Sci. Technol.

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The thermal diffusion of hydrogen is one of causes of uneven hydride precipitation in zircaloy fuel cladding tubes that are used in water reactors. In the diffusion model of hydrogen in zircaloy, the effects of the hydride on the diffusibility of hydrogen has been regarded as negligibly small in comparison with that of hydrogen dissolved in the matrix. Contrary to the indications given by this model, phenomena are often encountered that cannot be explained unless hydride platelets have considerable ostensible diffusibility in zircaloy.In order to determine quantitatively the diffusion characteristics of hydrogen in zircaloy, a thermal diffusion experiment was performed with zircaloy-2 fuel cladding tubes containing hydrogen beyond the terminal solid solubility. In this experiment, a temperature difference of 20"-30"C was applied between the inside and outside surfaces of the specimen in a thermal simulator.T o explain the experimental results, a modified diffusion model is presented, in which the effects of stress are introduced into Markowitz's model with the diffusion of hydrogen in the hydride taken into account. The diffusion equation derived from this model can be written in a form that ostensibly represents direct diffusion of hydride in zircaloy. T h e apparent diffusion characteristics of the hydride a t around 300°C are D,=2.3 ~10~exp(-32,000/RT), (where R : gas constant, T : temperature) and the apparent heat of transport Qp*= -60,000 cal/mol. The modified diffusion model well explains the experimental results in such respects a s reaches a steady state after several hours.

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Effect of Stress on Hydride Precipitation Behavior in Zircaloy-2

Cited by 2 publications

References 0 publications

Hydride reorientation in Zircaloy-4 cladding

Hydride reorientation in Zircaloy-4 cladding

Thermal Diffusion of Hydrogen in Zircaloy-2 Containing Hydrogen beyond Terminal Solid Solubility

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