对渗碳和离子注入两种工艺方法和作用进行了介绍，并对两种工艺方法进行了一定的比较，重点对近年来广泛应用的离子注入技术进行了推介。
Introducing the technics and effect of cementite and ion implantation, comparing the two technics, and recommending the ion importation techniques specially being widely used in recent years.
研究了渗碳后深冷处理对20钢机械性能的影响，分析讨论了深冷处理的作用机理。
The effect of deep cooling treatment after carburizing on properties of 20 steel is studied and the effect mechanism of the deep cooling treatment is analyzed.
在渗碳过程中，稀土元素对介质的分解，吸收和碳原子的扩散都起到了促进作用。
In the carburizing process, rare earth elements could promote the decomposition and absorption of medium and the diffusion of carbon atom.
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