| Popis: |
Tensile, burst, and creep tests have been conducted at 320 to 400°C on Zircaloy tubing. The main emphasis was placed on moderately stress-relieved tubing although tubing ranging from cold worked to fully recrystallized conditions also was investigated. Refined test techniques have been utilized to determine creep and burst loci. The anisotropy, which is not pronounced for standard tubing at elevated temperatures, is compared with texture measurements. The results are fitted with the Hill equation for anisotropic generalized stress. Creep rates are smaller under compressive stresses than under tensile stresses. Primary creep decreases steadily as the final annealing temperature is increased. The steady state creep rate, however, shows a minimum for moderately stress-relieved material. Burst elongation increases and yield strength decreases just at the onset of primary recrystallization while the uniform burst elongation increases at slightly higher annealing temperatures. |
