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MICROMECHANICS OF THE DAMAGE-INDUCED CELLULAR MICROSTRUCTURE IN SINGLE CRYSTAL Ni-BASED SUPERALLOYS

Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 361-368页

作者： M.Sakaguchi M.Okazaki Department of Mechanical Engineering Nagaoka University of Technology Tomioka Nagaoka 1603-1JapanDepartment of Mechanical Engineering Nagaoka University of Technology Tomioka Nagaoka 1603-1Japan

An analytical method to investigate the morphological evolution of the cellular mi-crostructure is explored and proposed. The method is essentially based on the Es-helby 's micromechanics theory, and it is extended so as to be applied for a material system containing inclusions with high volume fraction, by employing the average stress field approximation by Mori and Tanaka. The proposed method enables us to discuss a stable shape of precipitate in the material system, which must be influenced by many factors: e.g., volume fraction of precipitate; Young's modulus ratio and lattice misfit between matrix and precipitate; external stress field in multiaxial state; and heterogeneity of plastic strain between matrix and precipitate. A series of numerical calculations were summarized on stable shape maps. The application of the method to predict the γ' rafting in superalloys during creep showed that the heterogeneity of plastic strain between matrix and precipitates may play a significant role in the shape stability of the precipitate. Furthermore, it was shown that the method was successfully applied to estimate the morphology of the cellular microstructure formed in CMSX-4 single crystal Ni-based superalloy.

关键词： single crystal Ni-based superalloy cellular microstructure mi-cromechanics average field approximation stable shape of precipitate heterogeneity of plastic strain rafting

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