稀土与碳氮原子共渗及其微合金化创新理论  

Diffusion and micro-alloying mechanism of rare earth(RE) and carbon/nitrogen atoms permeated into surface layer of steel during RE-carburizing,-nitriding and-nitrocarburizing

作　　者：刘志儒[1] 闫牧夫[1] 罗群[1] 郑特强[1] 陈扬[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料热处理学报》2011年第7期121-129,共9页Transactions of Materials and Heat Treatment

基　　金：哈尔滨工业大学纳米材料及纳米表面工程创新团队;国家自然科学基金(51071061)项目

摘　　要：根据作者的研究成果,在经典化学热处理理论基础上把固体物理学新成就中的缺陷理论与扩散理论及析出相固溶析出理论和晶粒细化超细化理论相融合,首次提出了以稀土、间隙碳、氮原子Cottrell气团为核心的稀土化学热处理创新理论,在该领域开创出一种全新的扩散模式。创建了钢中新的稀土渗碳、稀土渗氮及稀土氮碳共渗工艺体系。新体系不仅显著提高了扩散速度,同时又能显著改善微观组织和大幅度提高使用性能,使齿轮类零件的使用寿命显著提高。According to the authors＇ achievements in RE thermochemical treatment field,the defect theory of solid physics,the diffusion theory,the precipitation theory of secondary phase and the grain refining and ultra-refining theory were combined together based on the classical thermochemical treatment theory.A novel RE thermochemical treatment theory including a new diffusion model has firstly put forward resulting from an establishment of Cottrell atmosphere composed mainly of RE atoms and interstitial atoms such as carbon and nitrogen.A new technical system about new RE-carburizing,-nitriding and-nitrocarburizing of steels was constructed.The application of the new system not only obviously increases the diffusion rate,but also significantly improves the microstructure and service performances.Thus the service life of the parts such as gears treated by the new technologies mentioned above can be prolonged remarkably.

关 键 词：稀土共渗 化学热处理 创新理论 

分 类 号：TG156.8[金属学及工艺—热处理]