Microstructural changes during creep and aging of a heat resistant MARBN steel and their effect on the electrochemical behaviour

The high creep strength of advanced boron alloyed 9 wt% Cr steels results from a precipitate stabilised martensitic microstructure. Grain boundaries and sub-boundaries are effectively pinned by boron stabilised precipitates. However, during creep exposure several degradation mechanisms with regards to precipitates are active such as, particle coarsening, phase transformations, dissolution of precipitates and precipitation of new phases. This...