Samples were taken for failure analysis from a defective component of the material quality 1.4832 from a residual wood combustion furnace. The examination involved wet chemical, optical microscopic, and scanning electron microscopic methods as well as electron beam micro-analytical investigations. Precipitations found to exist in the material were examined for their composition.The results allow to conclude that the material failed because of its carburization, nitridation, sulfidizing and selective oxidation as a consequence of thermal overstress and because of sulfur-containing and alkali-containing additives that were integrated in the process.This damage mechanism was untypical for the use of 1.4832 in the residual wood combustion plant and permits to conclude a short-timed and simultaneous effect of sulfur, sodium and potassion.
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