Formation of lamellar M23C6 on and near twin boundaries in austenitic stainless steels
Thin foil electron microscopy studies were made on the precipitation of lamellar M23C6 during aging at 973 K and 1073 K in water-quenched specimens of two austenitic stainless steels. After the precipitation on incoherent twin boundaries M23C6 formed on coherent twin boundaries and in the regions adjacent to incoherent twin boundaries. These precipitates showed lamellar morphology and were aligned in a specific manner with respect to the twin boundaries. Such lamellar precipitates were absent in the specimens which were isothermally treated at 1073 K after being transferred from the solution treatment temperature. The lamellar morphology of M23C6 is suggested to be developed by the influence of residual specific stress field around twin boundaries resulted from quenching.
Volume 43, 2020
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