Effect of cyclic recovery heat treatment on surface recrystallization of a directionally solidified superalloy

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Abstract

Microstructural evolution and micro-hardness of a directionally solidified Ni-base superalloy subjected to shot-peening during cyclic recovery heat treatment was studied. It was found that γ' dissolved and dislocation annihilation occurred during heating, while γ' re-precipitated when temperature dropped. Due to the formation of a stable dislocation network at γ/γ' interface, full recovery and therefore complete elimination of the surface recrystallization are difficult by the present cyclic recovery heat treatment.

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Xie, G., Zhang, J., & Lou, L. H. (2011). Effect of cyclic recovery heat treatment on surface recrystallization of a directionally solidified superalloy. Progress in Natural Science: Materials International, 21(6), 491–495. https://doi.org/10.1016/S1002-0071(12)60088-4

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