Abstract
The effect of morphological change in microstructure called by ‘rafting’ on fatigue crack growth (FCG) behavior of a directionally solidified Ni-base superally has been investigated. The FCG tests have been conducted in the rafted and non-rafted CT specimens. The anisotropic characteristics in the FCG rate were also explored. The crack growth rate of the rafted specimens was lower than that of non-rafted specimens at room temperature. At 600°C, the difference in crack growth behavior got significant. These results were discussed in relation to the crack propagation mode.
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