| 摘要: |
| 用RE–N–C–S–V–Nb盐浴多元共渗的方法对H13钢表面进行改性处理，形成了含有钒铌碳氮化物的高性能复合层。以多元共渗渗层厚度和显微硬度作为正交实验的参考指标，对多元共渗配方成分进行优化。根据正交实验中各因素水平对指标的影响结果得到最优的成分为：硼砂盐浴中，稀土含量5%，V2O5含量6%，Nb2O5含量6%；盐浴回火中，稀土含量1%，CNO-含量为34%。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对多元共渗层的组成和显微结构进行了分析和研究，结果表明：共渗后试样表面形成了NbN、VN、NbC、V8C7等高性能物相和组织，渗层厚度达100～120 μm且组织致密并呈弥散性分布；与常规氮化处理的试样比较，高温氧化增重速率缓慢仅为氮化处理的1/4，微裂纹出现在热疲劳循环2 000次以上。 |
| 关键词: H13钢 多元共渗 正交试验 成分优化 |
| DOI： |
| 分类号: |
| 基金项目:广西自然科学基金项目( 2010GXNSFA013020) |
|
| Formula Optimization on RE–N–C–S–V–Nb Multielements Penetrating for H13 Steel |
|
PANG Zu–gao, SHAN Zhao–jun, WEI Fu–dan
|
|
School of Materials Science and Engineering, Guangxi University, Nanning 530004
|
| Abstract: |
| A new R–E–N–C–S–V–Nb multielements salt penetrating method was carried out to improve the surface properties of H13 steel. Highperformance vanadium and niobium carbonitride composite coatings were formed on the surface. Thickness and microhardness of R–E–N–C–S–V–Nb multielements penetrating infiltration layer for H13 steel samples were analyzed by orthogonal experiment method. According to the effect of various levels of factors on the indices, optimum composition in borax saltbath is obtained, that is, RE: 5%, V2O5: 6%, Nb2O5: 6%; in saltbath tempering, RE: 1%, CNO-: 34%. The microstructure and composition of the composite coatings were analyzed by means of scanning electron microscopy and Xray diffraction. The results show that highperformance NbN，VN，NbC，V8C7 phases and organizations are prepared in the infiltration layer. The thickness of permeation layer is up to 100~120 μm and the microstructure shows compact and diffuse distribution. Its hightemperature oxidation rate of weight gain is 0.25 times slower than that of the conventional nitrided sample, and microcracks appear in more than 2 000 times thermal fatigue cycles. |
| Key words: H13 steel multielements penetrating orthogonal experiment formula optimization |
