用透射电镜（ＴＥＭ）观察离子氮碳共渗层横截面显微组织，结果表明：化合物层由柱状晶ε相及γ′相构成，且γ′相具有层错亚结构，并伴有晶格畸变。ε柱状晶中析出薄片状γ′相，柱状晶晶界上分布有岛状铁素体。扩散层与化合物层交界处为紊乱细晶γ′相。 The microstructure of the cross-section of the ion nitrocarburized layer was observed by transmission electron microscopy (TEM). The results show that the compound layer is composed of columnar ε phase and γ ’phase, and the γ’ phase has a layered fault sub-structure with lattice distortion. In the ε columnar crystal, a flaky γ ’phase is precipitated, and island-shaped ferrite is distributed on the columnar crystal grain boundary. Diffusion layer and compound layer at the junction of disordered fine crystal γ ’phase.