Abstract
Nitrogen, which is generated using the membrane or PSA method, contains caused by the generation process higher oxygen contaminations as cryogenic produced nitrogen. The investigations presented in this paper were done in order to find out if there is an influence of this remaining oxygen on the heat-treatment results particularly on the internal oxidation after carburizing. The tests were done on four different steel grades with a chromium content between 0,5-5,1% and a manganese content between 0,4 and 1,2%. The applied carburizing atmosphere was based on a 60 vol. % methanol and 40 vol. % nitrogen mixture. For the treatments with increased oxygen content, oxygen in the order of 0,5 and 1,0% was added to the nitrogen. The quantitative characterization of the internal oxidation was done by help of a scanning electron microscope and an image analysis system. The influence of the oxygen content on the microstructure and the microhardness was determined. Moreover, carbon and oxygen depth profiles were measured using the optical glow discharge spectroscopy and the results were compared with the ones from the image analysis system.
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