氮碳共渗对4Cr10Si2Mo钢渗层组织和表面粗糙度的影响

Influence of nitrocarburizing on microstructure and roughness of 4Cr10Si2Mo steel

对4Cr10Si2Mo钢试样进行快速氮碳共渗,在560℃保温30 min渗层可达15μm。电子探针成分分析结果表明,氮浓度分布较为均匀,碳浓度在接近表面处最高,随后在渗层中迅速降低,而Cr、Si、Mo在距渗层的表面一定距离处产生聚集。样品共渗层的表面粗糙度受温度和时间两方面的影响,共渗温度提高到570℃或共渗时间超过35 min,样品表面粗糙度变差。

A nitrocarburing layer with 15 μm thickness on 4Cr10Si2Mo steel was obtained by rapid treating at 560 ℃ for 30 min.The result of analysis by electron microprobe shows that the distribution of nitrogen concentration in the layer is uniform,while the carbon concentration is the maximum near the layer surface and then quickly decreases in the nitrocarburizing layer.Cr,Si,Mo in the layer gathered at a certain distance from the layer surface.The surface roughness of the steel can be affect by both nitrocarburizing temperature and time.The surface roughness is rapidly deteriorated with increasing the temperature up to 570 ℃ or prolonging the nitrocarburizing time to more than 35 min.