45钢离子氮氧共渗与离子渗氮动力学对比研究  

Kinetics of plasma oxynitriding and plasma nitriding for 45 steel

作　　者：刘晗[1,2] 杨星梅[1] 潘太军[1,2] 宋仁国[1,3] 胡静[1,2] 

机构地区：[1]常州大学江苏省材料表面科学与技术重点实验室,江苏常州213164 [2]常州大学江苏省光伏科学与工程协同创新中心,江苏常州213164 [3]常州赛斐斯新材料科技有限公司,江苏常州213164

出　　处：《材料热处理学报》2016年第2期208-211,234,共5页Transactions of Materials and Heat Treatment

基　　金：江苏省研究生创新基金(SCZ100431322);江苏高校优势学科建设工程(JS-2012-173)

摘　　要：在783～843 K温度范围和不同保温时间（30～240 min）对45钢进行了离子氮氧共渗和离子渗氮表面改性处理,对比研究了两种处理方法的动力学。离子氮氧共渗是在离子渗氮的基础上添加流量为0.2 L/min的空气实现的。利用光学显微镜和X射线衍射仪对化合物层显微组织、厚度及物相组成进行了测试和分析。结果表明,添加适量空气可显著促进活性氮原子在基体内的扩散,离子氮氧共渗的扩散系数比普通离子渗氮显著提高,扩散激活能从227.25 k J/mol降低到138.57 k J/mol,从而可达到降低温度或缩短保温时间的效果。同时,计算得到了45钢在783~843 K温度范围内离子氮氧共渗时化合物层厚度与温度T（K）和保温时间t（s）的动力学关系式。The kinetics of plasma oxynitriding and plasma nitriding for 45 steel was investigated. The nitriding processes with and without air addition of 0.2 L/min were carried out at the temperatures ranging from 783 K to 843 K with holding time ranging from 30 min to 240 min in nitriding furnace. The mierostructure, thickness and phases of the layers were analyzed by means of optical microscope and X-ray diffraction. The results show that appropriate air addition can promote the diffusion of active nitrogen atoms in the substrate, thus the nitriding efficiency is improved. In other words, plasma oxynitriding can shorten the holding time and decrease the treating temperature to get the expected thickness comparing with plasma nitriding. The diffusion coefficient of nitrogen in 45 steel by plasma oxynitriding is much higher than that of plasma nitriding. In addition, comparing with plasma nitriding, activation energy for the nitrogen diffusion in 45 steel is reduced from 227.25 kJ/mol to 138.57 kJ/mol by air addition, which leads to the increase of the layer thickness. And the kinetics of plasma oxynitriding in the temperature range of 783 K to 843 K is obtained.

关 键 词：45钢 空气 离子氮氧共渗 动力学 扩散 

分 类 号：TG178.1[金属学及工艺—金属表面处理]