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Vol.39, No.1, 1 ~ 9, 2001
Title
Grain Boundary Characterization and the Precipitation Behavior of Grain Boundary Chromium Carbides in Alloy 690TT
임연수Yun Soo Lim,한정호Jung Ho Han,조해동Hai Dong Cho,김정수Joung Soo Kim
Abstract
The correlation between grain boundary type characterized by the coincidence site lattice(CSL) model and precipitation behavior of grain boundary chromium carbides in the thermally treated Alloy 690 (Alloy 690TT) was investigated through transmission electron microscopy. The chromium carbides precipitated in Alloy 690TT were identified as chromium-rich M_(23)C_6. They were not observed on the coherent twin boundaries (Σ3_c), and their precipitation was suppressed on nearly exact CSL boundaries such as Σ11 and Σ15. Small and faceted ones were found at the low angle boundaries with less than 15 degrees of misorientation angle. On the other hand, coarse and discrete carbides were precipitated along the random high angle grain boundaries, and needle-like ones grown parallel to the coherent twin boundary evolved on the incoherent twin boundaries (Σ3i). The grain boundary dislocations on some special boundaries were also examined to elucidate the small deviations from the exact lattice site coincidence.
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