Abstract
The precipitation and aging characteristics of MC and M23C6 in a Ti-stabilized austenitic stainless steel with a balanced Ti and C content have been investigated for aging times of up to 5000 h at 750°C. It was found that MC precipitated on dislocations and stacking faults while M23C6 initially precipitated intergranularly. Quantitative measurements made by transmission electron microscopy showed that, after 5000 h aging, MC which had initially precipitated on dislocations partially transformed to intragranular M23C6. The MC precipitates on stacking faults were found to be more stable than those on dislocations so that denuded zones developed around the sheets of stacking fault precipitate at long aging times. Although the partial transformation of MC precipitated on dislocations resulted in a reduction in the volume fraction of this type of precipitate, it was found that the number density of these particles increased. These results are discussed in terms of expected changes in the composition of the MC precipitates as a function of aging time.
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