空气与C3H8含量对气体氧-氮-碳三元共渗化合物层结构的影响  

Effect of Air and C_3H_8 Content on Microstructure of Compound Layer During Gas Oxynitrocarburising Process

作　　者：郑贺 陈仁德 杨巍 柯培玲 汪爱英[1] 

机构地区：[1]中国科学院宁波材料技术与工程研究所宁波市海洋防护与应用技术重点实验室,浙江宁波315201

出　　处：《热加工工艺》2013年第10期145-147,共3页Hot Working Technology

基　　金：浙江省自然科学基金项目(Y4100156);宁波市工业重大(重点)择优委托科技攻关项目(2011B1016);宁波市江北区科技计划工业科研攻关项目(2010A0203)

摘　　要：以NH3、空气、C3H8与N2混合气体作为气源,采用两段式气体氧-氮-碳三元共渗方法,在580℃加热2 h,随后降温至540℃继续加热1.5 h,实现对S20C钢的表面强化。保持通入气体总流量、空气与C3H8添加比例不变,改变空气与C3H8的总含量,研究不同气氛组成处理后S20C钢表面渗层的厚度、形貌以及相结构变化趋势。结果表明,经过处理后的样品表面形成了具有良好耐摩擦、耐腐蚀性能的亮白色化合物层,该化合物层具有单一ε-Fe2-3(N,C)物相,其厚度随空气与C3H8的总含量的增加而增大。The effects of air and C3H8 addition on the oxynitrocarburising characteristics of S20C steels in an atmosphere of NH3-air-C3H8-N2 gas system were investigated. The results show that, with the increase of total flow rate of air and hydrocarbon reactive gases, the thickness of compound layer of S20C steels increases due to the increased carbon activity in the atmosphere. According to the X-ray diffraction analysis, the compound layer is composed of high purity single a-phase, the thickness of compound layer increases with the increase of air and C3H8 content.

关 键 词：氧-氮-碳三元共渗 空气 C3H8 化合物层厚度 ε-Fe2-3(N C)相 

分 类 号：TG156.8[金属学及工艺—热处理]