Abstract
The influence of β-heat treatment in temperatures 1,000–1,200°C on the microstructure and mechanical anisotropy of Zircaloy-4 fuel cladding was investigated. Morphology of second phase particles and α-grain were markedly changed by the heat treatment. However, they were not much varied by the treatment conditions because of the constant cooling rate of 25°C/s. Heat treated Zircaloy tubes exhibited texture changes but the preferred orientation of grains was still remained. With increasing heat treatment temperatures, the 0.2% yield strength decreased but the hoop strength was not changed due to the texture effect and α-plate width. The texture parameter, f values of Zircaloy tubes were influenced by the heat treatment conditions. In particular, a linear relationship between the 0.2% yield strength and the f value in longitudinal direction was derived.
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