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Microstructural evolutions during thermal exposure and their effects on the mechanical properties of GTD 111 have been investigated. After standard heat treatment, polycrystalline GTD 111 specimens were thermally exposed up to 10000 hours in the temperature range of 871-982 o C. Distribution and composition of the existing phases have been analyzed both quantitatively and qualitatively using electron microscopy, EDS and image analyses. The activation energy calculated for J' coarsening was similar to that for self diffusion. In this alloy eta(K ) phase may form during casting, standard heat treatment and thermal exposure at and below 927 o C. MC carbides decomposed into K + M23C6 during thermal exposure at 871 o C and 927 o C rather than M23C6 + J'. Precipitation of sigma(V ) phase was observed in the vicinity of MC or M23C6 carbides, especially in the specimen exposed at 871 o C. During thermal exposure at 982 o C, both precipitation of continuous J' + M23C6 film along the grain boundary and dissolution of fine K within J-J' eutectic have occurred. Tensile tests and constant load creep tests with thermally exposed GTD 111 have been conducted to understand the effect of thermal exposure and grain boundary structure on mechanical properties. Formation of intergranular K phase reduces the room temperature ductility, but does not affect creep rupture life and high temperature ductility in the present study.

ETA Phase Formation During Thermal Exposure and Its Effect on Mechanical Properties in Ni-Base Superalloy GTD 111