Abstract
Grain boundary serration is studied as a function of cooling rate in a number of Ni-based superalloys, e.g. IN 738, Nimonic 115 and Nimonic 105. The mechanism is related to γ′ precipitation in these alloys and a higher γ′ solvus temperature than the M 23C 6 solvus temperature appears to be a prerequisite for the development of serrations. A model based on the grain boundary primary γ′ particle movement causing the displacement of the local grain boundary segment and initiating serrated grain boundary formation has been proposed.
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