Transformation of (Cr,M)7C3-type carbides during nitriding of chromium alloyed steels |
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Authors: | C Leroy H Michel M Gantois |
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Affiliation: | (1) Laboratoire de Genie Metallurgique, (UA CNRS 159-Science et Génie des Matériaux Métalliques)-Ecole des Mines, Parc de Saurupt, 54042 Nancy-Cedex, France |
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Abstract: | Thein situ rearrangement of (Cr, M)7C3-type carbides has been observed during ion nitriding of a commercial chromium-carbon alloyed steel (Z160CDV12). The mass
balance concerning nitrogen, carbon and substitutional elements proves that carbides undergo a total transformation into substitutional
(Cr, M) N-type nitrides with a simultaneous release ofα-iron from the very nitride phase. A detailed transmission electron microscopy microstructural study confirms the analytical
results. There are no crystallographic relations between the carbides and their corresponding transformation products. The
rejection of carbon from the carbides into the ferrite matrix leads to the precipitation of a network of cementite along the
prior austenite grain boundaries. |
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