快速离子氮化渗氮层相组成和微观组织形貌研究

渗氮件的性能与渗氮层的化合物相组成和扩散层的微观结构密切相关。本文基于渗氮温度和氮势对渗氮层形成与分解的影响规律，借助X射线衍射分析和透射电子显微技术，对循环氮势快速离子氮化渗氮层相组成和微观组织形貌进行了深入研究，探讨了其快速渗氮的机理。结果表明，与常规离子渗氮工艺相比，通过周期地控制渗氮温度和氮势变化，快速离子渗氮不仅能显著地提高渗氮速度和增加材料的渗氮层深，而且使合金氮化物种类明显增多，扩散层中的沉淀硬化物也更细小弥散，有利于改善渗氮层质量和提高渗氮工件性能。

Research on Phase Composition and Microstructure of Rapid Ion Nitriding Layer

Properties of nitrided parts have close relation to phase composition of their compound layer and microstructure of their diffusion layer.Based upon the influence of nitriding temperature and nitrogen potential on formation and decomposition of ion nitriding layer,the phase compositions and microstructures of ion nitrided layer under cyclic nitrogen potential are studied with X ray diffraction analysis and TEM,and mechanism of rapid ion nitriding is also discussed is that the rapid ion nitriding,by controlled thermal cycling and nitrogen potential cycling can not only increase the nitriding speed and nitriding layer depth of materials compared with conventional ion nitriding technique, but also the kinds of alloy nitrides,and give more fine and spread precipitation hardness phases of diffusion layer.It is very helpful to improve quality of the nitriding layer and to enhance properties of nitrided parts.