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作者们以往已经报告了球墨铸铁盐浴软氮化基础研究的结果。根据该结果可以了解到,经570℃处理在最表面上形成ε碳氮化合物(Fe_(2-3)N 基体)、γ′(Fe_4N)及 Si_3N_4的氮化物,内部扩散层析出 Si_3N_4的细小氮化物,Si_3N_4的存在大大地有助于提高硬度。并且弄清了,Fe-Si(Si1～4%)二元合金也形成同样的氮化物,增加含 Si 量时,氮化物层和氮化深度由于氮向αFe 的扩散速度降低而变小,因而表面硬度提高。由于球墨铸铁的离子氮化处理具有下列优点:无公害,由于低温处理故零件变形
In the past, the authors have reported the results of the fundamental research on ductile iron salt bath nitrocarburizing. According to the results, it can be understood that nitrides of ε carbonitride (Fe_ (2-3) N), γ ’(Fe_4N) and Si_3N_4 are formed on the outermost surface by the treatment at 570 ° C, and Si_3N_4 is precipitated in the internal diffusion layer The presence of nitride, Si_3N_4, contributes greatly to the increase of hardness. Furthermore, it has been clarified that the same nitride is also formed in the Fe-Si (Si1 to 4%) binary alloy. When the content of Si is increased, the nitride layer and the depth of nitriding become smaller as the diffusion rate of nitrogen into αFe decreases, Surface hardness increased. Due to the ductile iron ion nitriding treatment has the following advantages: pollution-free, as a result of low-temperature processing of the parts so deformed