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对低镍奥氏体不锈钢201在糊状区分别在氮气环境中保温0、5、10、15 min,探究保温时间对氮含量和气孔率的影响。结果表明:随着保温时间的增长,氮含量显著提高。糊状区保温可在避开凝固过程中的铁素体区,促进液相中的氮向奥氏体扩散。经过热力学分析,化学势差提供了氮从液相向奥氏体扩散驱动力。因此,糊状区保温是一种有效的不锈钢增氮方法,为生产高氮不锈钢提供了新思路。
The low nickel austenitic stainless steel 201 was kept in nitrogen atmosphere for 0, 5, 10 and 15 min respectively in the mushy zone. The effect of holding time on nitrogen content and porosity was investigated. The results showed that with the increase of holding time, the nitrogen content increased significantly. Mushy zone insulation can be avoided in the solidification process of the ferrite zone, to promote liquid nitrogen to austenite diffusion. After thermodynamic analysis, the chemical potential difference provides a driving force for the diffusion of nitrogen from the liquid phase to the austenite. Therefore, the mushy zone insulation is an effective stainless steel nitrogen method for the production of high nitrogen stainless steel provides a new idea.