Abstract
The effect of preoxidation on the tensile property of Cr-coated Zr-4 alloy was investigated. Under tensile stress, cracks rarely occurred in the Cr coating preoxidized at 900 °C, which benefited from recrystallization transforming columnar grains into equiaxial grains. In contrast, when preoxidized at 1000 °C or higher temperature, microcracks were initiated in the interfacial diffusion layer and penetrated into both Cr coating and Zr-4 substrate under tension, resulting in premature failure of the sample. The earlier failure was triggered by multiple factors, including grain coarsening in the coating, Zr-Cr interdiffusion, transportation of oxygen, and phase transformation in the Zr-4 substrate.
Published Version
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