AISI440C钢氧-氮-碳三元共渗渗层显微组织与硬度研究  

Study on Microstructure and Hardness of AISI440C Steel by Oxynitrocarburizing Treatment

作　　者：陈仁德[1] 郑贺[1] 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、宁波市海洋防护材料与工程技术重点实验室,浙江宁波315201

出　　处：《热加工工艺》2012年第18期130-132,136,共4页Hot Working Technology

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

摘　　要：以空气、丙烷、氨气等作为气源,利用低温气体多元共渗技术在AISI4400C钢表面进行低温气体氧-氮-碳三元共渗处理,以提高其表面硬度。借助光学金相显微镜、X射线衍射仪、显微硬度计和扫描电镜,对渗层形貌、物相、显微硬度梯度变化趋势以及元素分布进行检测分析。结果表明,在基材表面共渗层形成了厚且均匀致密的化合物层,该化合物层以氮化物、碳化物和氧化物为主;三元共渗过程中氧的加入可促进化合物层的形成,缩短共渗时间,获得的三元共渗层表面硬度最高可达1170 HV。Gas oxynitrocarburizing at low-temperature of AISI4400C steel was carried out by gas multi-component permeation technique with the mixed gas of air,C3H8 and NH3.The morphology,microstructure and hardness of the composite layer were analyzed by microscopy,XRD,microhardness apparatus testers and SEM,respectively.The experimental results show that a thick,dense and uniform compound layer is formed on the surface of AISI4400C steel which can consist of nitrides,carbide and oxide.The introduction of oxygen can promote the formation of the compound layer during the oxynitrocarburizing process to short the permeation time significantly,and the maximum hardness of the penetrated layer is 1170HV.

关 键 词：AISI440C钢 氧-氮-碳三元共渗 化合物层 相结构 硬度 

分 类 号：TG156.8[金属学及工艺—热处理]