Scanning Microscopy


Several ferritic-martensitic laboratory melts with a varying chromium content of 9-14 wt.% and delta-ferritic quantities ranging from 0-25% were investigated by means of impact-testing. The negative influence of delta-ferrite (>0.5%) on the mechanical properties can be explained by the formation of dendritic M23C6-precipitates around the delta-ferrite grains. The development of these dendrites was studied as a function of the cooling kinetics using dilatometric and metallographic measurements and by SEM (scanning electron microscopy) and TEM (transmission electron microscopy) investigations.

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