本文用200CX电子显微镜研究780℃热处理后的20Cr钢的C—N渗层精细结构。因为20Cr钢的共渗温度正好处于(α+γ)两相区,所以共渗层的组织状态与单相奥氏体共渗时组织状态有很大差别。 20Cr钢用于制造轻工机械另件,由于尺寸小,精度要求高,常规的860℃奥氏体单相区C—N共渗难以保证另件的热处理形变不超出设计规范,考虑到这类另件一般承载荷不大,故渗层可以较浅(0.2～0.4毫米),热处 In this paper, 200CX electron microscopy 780 ℃ heat-treated 20Cr steel C-N layer fine structure. Because 20Cr steel co-infiltration temperature just in the (α + γ) two-phase region, so the co-diffusion layer of the microstructure and single-phase austenite microstructure at the time there is a big difference. 20Cr steel for the manufacture of light industrial machinery parts, due to small size, high precision, the conventional 860 ℃ austenite single-phase C-N co-infiltration is difficult to ensure that the other pieces of the heat treatment deformation does not exceed the design specifications, taking into account this type The other part of the general bearing load is small, so the infiltration layer can be shallow (0.2 ~ 0.4 mm), heat