介绍了快速压力渗碳工艺，并对其机理进行了分析。
Rapid carburizing process by increasing furnace pressure is introduced and its mechanism is analysed.
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.
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