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Controlled nitrocarburizing experiments  were performed at 823 K and 853 K in order to systematically investigate the influence of the chemical potentials of carbon and nitrogen imposed by NH 3 /H 2 /CO/CO 2 /H 2 O-containing gas mixtures on the microstructural and compositional evolution of the compound layer formed on pure α-Fe substrates. The morphological evolution of the compound layer was investigated by optical microscopy. The nitrogen and carbon concentration-depth profiles in the layer were determined by electron-probe microanalysis (EPMA). Layer-growth kinetics was analysed on the basis of compound layer-thickness measurements. For a fixed chemical potential of nitrogen it was found that the microstructure and the layer-growth kinetics are strongly dependent on the chemical potential of carbon.

htm journal of heat treatment and materials

Influence of the chemical potential of carbon on the microstructural and compositional evolution of the compound layer developing upon nitrocarburizing of α-iron *