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Abstract
The evolution of morphological characteristics associated with creep induced cavities in a cast polycrystalline superalloy under various hot isostatic pressing conditions was investigated. Concentrically oriented N type γ′ rafting structures near the sintering cavities were formed during sintering. The stress gradient causing a chemical potential gradient around the cavity plays a dominant role in solute diffusion, resulting in the nucleation and continuous growth of the solid solution on the cavity surface to achieve healing.
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The financial support of the university–industry cooperation project (grant no. 201110026-01), sponsored by the Aviation Industry Corporation of China, is gratefully acknowledged.