原材料与组织对42CrMo钢离子氮化的影响

Effect of Raw Material and Microstructure on Plasma Nitriding of 42CrMo Steel

研究并解决了中碳合金钢42CrMo经离子氮化处理后存在氮化物或疏松级别超差的问题。结果发现,相比原材料硬度,原始组织对离子氮化产生的影响更大一些。若调质组织粗大、不均匀,则离子氮化组织中白亮层不均匀,白亮层内侧易析出严重的网状氮化物,且扩散层存在较多的脉状氮化物。长时间库存的工件表面容易发生难以发现的微观氧化,会导致离子氮化处理后白亮层略厚以及表面疏松层。

The problem about out of tolerance of nitride level and loose levels of 42 Cr Mo medium carbon alloy after plasma nitriding has been investigated and solved. The results show that compared with the haedness of raw material,the original structure for the effect of ion nitriding is greater. If the quenched and tempered microstructure is coarse and uneven,the white bright layer in ion nitriding structure is not uniform,the inner inside of white bright layer is easy to precipitate serious network nitride,and there are more nervation nitride in diffusion layer. The workpiece surface of the long time inventory is prone to hard to find the micro oxidation which will cause white bright layer slightly thick and surface loose layer after ion nitriding.