Extremely large grain-boundary particles have previously been observed in Type 316 steel after creeping for short times at 625°C. These features have been identified as consisting of numerous plates of M23C6 carbides precipitated on partial dislocations and stacking faults emitted from high-angle grain boundaries. No wholesale phase transformation to produce large intermetallic particles occurs in longerterm tests, and the large particles do not, of themselves, appear to weaken the boundaries and cause cracking.
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