| Abstract |
| Thermal creep properties of the zirconium tube which was developed for high burnup application were evaluated. The creep test of cladding tubes was carried out by the internal pressurization method in the temperature range from 350℃ to 400℃ and from 100 MPa to 150 MPa in the hoop stress. Creep tests were lasted up to 900 days, which showed the steady-state secondary creep rate. The creep resistance of zirconium claddings was higher than that of Zircaloy-4. Factors that affect creep resistance, such as alloying element, applied stress, activation energy, and solute impurities were discussed. Tin as an alloying element was more effective than niobium due to solute hardening. Viscous glide where mobile dislocation was interacted and hindered by the diffusion of solute atoms was the most dominant deformation mechanisms in advanced cladding tube. (Received December 2, 2004) |
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| Key Words |
| Creep, Zirconium, Cladding, Niobium, Tin |
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