稀土Ce和C原子对20CrMnTi钢渗氮层的影响

Effect of Rare Earth Ce and C Atom on Nitriding Layer of 20Cr Mn Ti Steel

通过在离子渗氮炉的阴极盘上放置少量的稀土Ce和椰壳活性炭C,采用循环变温工艺对调质后的20Cr Mn Ti钢进行离子渗氮。设计了几种渗氮工艺作为对比,经过试验和检测发现:同时加入稀土Ce和活性炭的离子渗氮工艺处理后的试样渗氮层厚度和表层硬度明显高于单独加稀土Ce或活性炭的工艺;稀土Ce能够同时促进C和N原子在20Cr Mn Ti钢中的扩散速度;C原子的加入有助于20Cr Mn Ti钢中ε相的增多,而稀土Ce的加入却阻碍了ε相的增多;

The ionitriding for 20 Cr Mn Ti steel after quenching and tempering is done by cycle heterotherm technology,though a small amount of rare earth Ce and coconut shell activated carbon placed on the cathode plate of ion nitriding furnace. Several kinds of nitriding processes are designed as a comparison.Through experiments and testing,we found that nitriding layer thickness and surface hardness of the specimens after ion nitriding while adding rare earth Ce and activated carbon ion are significantly higher than the single adding rare earth Ce or activated carbon. Rare earth Ce can also promote the diffusion velocity of C and N atoms in 20 Cr Mn Ti steel. Adding C atom can help to increase ε phase in 20 Cr Mn Ti steel,and adding rare earth Ce has hindered ε phase increasing.