An Electron Microscopy Study of Vein-like Grain Boundary Microstructure in Nitrocarburized Low Carbon Steels
An Electron Microscopy Study of Vein-like Grain Boundary Microstructure in Nitrocarburized Low Carbon Steels
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氮碳共渗低碳钢脉状晶界显微组织的电子显微镜研究
DOI：
10.1016/j.jmst.2013.03.027
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
He, Aigui
中科院分区：
文献类型：
--
作者：
Chen, Wanglin;Wu, Cuilan;Chen, Jianghua;He, Aigui
碳钢氮碳共渗层中经常出现脉状粗化晶界。电子探针X射线显微分析表明，这种脉状的GB富含氮和碳原子。透射电子显微镜和扫描电子显微镜进一步揭示了粗化晶界由γ′-氮碳化物（Fe 4（C，N））和ε-氮碳化物层组成，这些层是在氮碳共渗过程中由于晶界处的高氮浓度而形成的。结果表明，<112>γ′相片层中存在大量的{111}微孪晶，ε相薄片优先在孪晶边界形核，取向关系为{0001}ε//{111}γ′。大的γ′-片层在生长过程中可能变成小面状，而薄的ε-片层可能变厚并成为脉状晶界的主要部分。脉状晶界的显微组织演化为：α + [N]/[C] → γ′ + [C，N] → ε-氮碳化物。
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 of γ′-nitrocarbide (Fe4(C,N)) and ε-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 γ′-phase lamellas and thin ε-phase slices prefer to nucleate at their twin boundaries with the orientation relationship of {0001}ε//{111}γ′. Upon growing large γ′-lamellas may become faceted and thin ε-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.
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