In this paper the influence of carbon in the nitrocarburized layers is evaluated. The nitrocarburized layer can be obtained by various processes (salt and gaseous methods), that produce layers with different carbon content percentages. By the simple test method that consists in calculating the numbers and lengths of cracks generated by Vickers indentations, it has been possible to classify the various processes of nitrocarburizing. The tests have demonstrated the importance of carbon percentages on the fracture toughness of nitrocarburized layers.
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