Abstract
In the present study a method suitable for evaluation of the particle ― boundary distance using fully automatic image analysis has been described. The method has been demonstrated in the case of three different microstructural states of the tempered martensite ferritic steel P91. The following results were obtained: In the state before creep (as-received) 70% of the M 23 C 6 carbides are situated near the subgrain boundaries. The distance from the subgrain boundary where statistically relevant population of carbides can be found is less than 0.1 μm. The influence of creep at 600° C, 130 MPa on the microstructure of the as-received state is relatively weak what is reflected by a very limited subgrain growth and by almost the same statistical distribution of the carbide-subgrain boundary distances
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