| 1 | An Electron Microscopy Study of Vein-like Grain Boundary Microstructure in Nitrocarburized Low Carbon Steels显示文摘The coarsened grain boundaries(GBs) with vein-like morphology frequently appear in the nitrogen diffusion layer of nitrocarburized carbon steels.The electron probe X-ray microanalysis shows that such vein-like GBs are rich in nitrogen and carbon atoms.Transmission electron microscopy and scanning electron microscopy further reveal that the coarsened GBs consist ofγ'-nitrocarbide(Fe_4(C,N)) andε-nitrocarbide lamellas that are formed during nitrocarburizing due to high nitrogen concentration at GBs.It is shown that many of {111}<112> micro twins exist in the y'-phase lamellas and thin e-phase slices prefer to nucleate at their twin boundaries with the orientation relationship of {0001}_ε//{111}_γ'.Upon growing large y'-lamellas may become faceted and thin e-lamellas may grow thicker and become the main portions in the vein-like GBs.The microstructure evolution occurring in the vein-like GBs can be depicted as:α+[N]/[C]→>γ' +[C,N]→ε-nitrocarbides. | Wanglin Chen Cuilan Wu Jianghua Chen Aigui He | 2013 | Journal of Materials Science & Technology2013，29，7： | 1 |
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