Abstract
Thermal exposure tests were carried out at the same temperature and duration as those of creep tests. Growth of γ′ either in the matrix or in the interdendritic regions was observed during high temperature thermal exposure. The growth of γ′ caused an isolated γ island in the γ/γ′ eutectics within which fine HfC particles precipitated. Some directional coarsening of γ′ was found in the specimens exposed at 1050°C. MC carbide reaction with the y matrix was observed in crept and thermally exposed specimens. Needle-like precipitate, a kind of TCP, was found in the specimen crept at 1050°C for 400 hours.
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