镧、铈、钕在722M24钢离子氮化中的作用

将纯稀土金属镧、铈、钕分别放入离子氮化炉中作为溅射源，对722M24钢进行离子氮化，用扫描电镜进行了氮化代表层物相的二次电子象观察，并用能谱仪、二次离子质谱仪、X射线衍射仪和辉光放电光谱仪对氮化表层进行了元素分析及物相结构分析，显微硬度计测量了加不同稀土氮化后沿氮化层的分布，稀土元素在不同程度上影响辉光发电特笥，稀土金属离子氮化时部分溅射并沉积在钢的表面，从而影响了氮化效果,不同稀土元素在离子氮化中的作用有所不同。

Plasma Nitriding of 722M24 Steel with Pure Lanthanum, Cerium and Neodymium as Sputter Sources

The influence of pure rare earth addition on the plasma nitriding response of low alloy steel was investigated. For this purpose, pure rare earth metals, La, Ce and Nd were put into the plasma nitriding furnace as a sputter source during nitriding of 722M24 steel. A variety of experimental and analytical techniques were employed to evaluate the structures and hardening response of the nitrided layers. These include metallography for structural examination, glow discharge spectrometry and secondary ion mass spectrometry for chemical composition profile analysis, X ray diffraction for phase identification and microhardness testing for hardness profile measurements. The results show that the incorporation of rare earth metals in the glow discharge during plasma nitriding not only influences the discharge characteristics but also results in the deposition of rare earth atoms and their compounds onto the specimen surface. These significantly affect the response of the investigated steel to plasma nitriding. The extent of influence on plasma nitriding varies with different rare earth metals.