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以201不锈钢为原材料,采用在糊状区保温的方法,保温时间分别取0、5、10、15 min,探究保温时间对氮含量的影响。结果表明,随着保温时间的增长,氮含量显著提高。分析发现,糊状区保温可以在避开凝固过程中的铁素体区的同时,促进液相中的氮向奥氏体扩散,以此来增加氮含量。通过对氮含量与微观组织关系的分析,可以通过控制糊状区保温时间,来获得适宜的组织,适用于不同的工况。因此,糊状区保温是一种有效的不锈钢增氮方法,为不锈钢增氮提供了一个新思路。
Using 201 stainless steel as the raw material, the method of keeping warm in the mushy zone was adopted, and the holding time was taken for 0, 5, 10 and 15 min respectively to investigate the effect of the holding time on the nitrogen content. The results showed that with the increase of holding time, the nitrogen content increased significantly. It is found that the mushy zone can increase the nitrogen content while avoiding the ferrite zone in the solidification process and promote the diffusion of nitrogen in the liquid phase to austenite. Through the analysis of the relationship between nitrogen content and microstructure, the proper organization can be obtained by controlling the holding time of the mushy zone, which is suitable for different working conditions. Therefore, the mushy zone insulation is an effective method of increasing nitrogen in stainless steel, which provides a new idea for increasing nitrogen in stainless steel.