用透射电镜研究了高温镀铁离子氮碳共渗处理后渗层的微观组织结构,高温镀铁层晶粒比较大,多为垂直于表面的柱状晶组织,有明显择优取向。经离子氮碳共渗处理形成的组织也与普通钢铁材料经同样工艺处理后的组织不同。柱状晶形成了扩散通道,因此其他合物层较薄,而扩散层相对来说比较厚。对它们逐层进行了形貌与电子衍射分析。最表面的化合物层是由致密的块状ε-Fe_(2-3)N相和γ′-Fe_4N相组成(图a)。块状晶体内无层状析出,这是因为最表层冷却速度快,冷却过程中来不及转变,而保留渗扩中形成的组织。次表成的化合 The microstructure of the infiltrated layer after high-temperature iron-plating nitrocarburizing was studied by transmission electron microscopy. The grain of high-temperature ferriferous layer was relatively large, mostly of columnar crystal structure perpendicular to the surface and had obvious preferential orientation. The structure formed by ion nitrocarburizing is also different from that of ordinary steel after the same process. The columnar crystals form diffusion channels, so other compound layers are thinner and the diffusion layers are relatively thicker. They were layer by layer morphology and electron diffraction analysis. The outermost compound layer is composed of a dense blocky ε-Fe_ (2-3) N phase and a γ’-Fe_4N phase (Fig. A). Layered crystals within the layer-free precipitation, it is because the outermost surface cooling rate, too late in the cooling process, while retaining infiltration in the organization formed. Sub-table into the compound