Abstract
The urea nitrocarburizing of nodular and compacted graphite cast irons has been investigated. Optical microscopy, EDAX analysis and hardness measurements have shown that a thick compound layer with high contents of nitrogen and silicon is formed, and a greater hardness in the area around the graphite beneath the surface is observed. The compacted cast iron with interconnected graphite has been found to exhibit a smaller effective diffusion zone, and formed Si3N4 precipitates within the hardened area. The nitrided nodular cast iron exhibited a higher fatigue strength increment and a smaller elongation decrement than that of compacted cast iron. Most fracture surfaces of compacted cast iron were found to be granular whereas the nodular cast iron was characterized as transgranular cleavage.
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