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在高循环应力和接触载荷不大的磨损条件下工作的零件广泛地应用低温渗氮。这种工艺在600℃以下(低于共析转变温度)于不同的扩渗介质(液体的和气体的,其中也包括添加含碳气体的气氛)中进行。低温渗氮时,不论用何种扩渗介质,总是要优先发生氮的扩散,扩散层的组织决定于铁-氮状态图。碳(氧)参与形成表面氮化物层,并能促进碳氮化物(碳氧氮化物)的形成。对渗氮工艺虽有了很多的研究,但有些问题仍需继续探讨,如: 1)生产结构强度高并能获得满足使用性能要求的新型渗氮钢; 2)寻找能得到规定的相成分和组织的渗氮工艺控制方法; 3)渗氮层形成过程的强化;
Low temperature nitriding is widely used for parts that operate under high cycling stress and wear conditions with low contact loads. This process is performed at 600 ° C (below the eutectoid transformation temperature) in different expansion media (liquid and gas, including atmosphere with addition of carbon-containing gas). At low temperature nitriding, regardless of the type of media used, diffusion of nitrogen is always preferentially occurring. The structure of the diffusion layer is determined by the iron-nitrogen state diagram. Carbon (oxygen) participates in the formation of surface nitride layers and promotes the formation of carbonitrides (carbon oxynitrides). Although a lot of research has been done on the nitriding process, some problems still need to be further explored, such as: 1) new nitriding steel with high structural strength and performance requirements; 2) looking for the phase composition and Organization nitriding process control method; 3) nitriding layer strengthening process;