Abstract
In this study the composition of a Ni–Cr–Co based superalloy was modified with silicon additions in order to observe its effects on the microstructure. The evolution of the microstructure was investigated by electron microscopy of as-cast samples containing various amounts of Si ranging from 0.48 to 5.43 wt.%. The precipitated phases were identified through electron diffraction to be σ (sigma), χ (chi), and M 23C 6. The σ precipitates of blocky morphology appeared to enclose the precipitates of χ phase. Lamellar regions consisting of σ and M 23C 6 were observed to form along the boundaries between the σ particles and the neighboring phases. These lamellar cells were observed to have grown into the intermetallic phases σ and χ. A crystallographic relationship was also found to exist between the σ and M 23C 6.
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