高氮奥氏体不锈钢氮含量影响因素研究及预测  

Study on Factors Influencing Nitrogen Content in High Nitrogen Austenitic Stainless Steel and Prediction

作　　者：房菲 李鑫 侯彬 李静媛[2] Fang Fei;Li Xin;Hou Bin;Li Jingyuan(China Nuclear Power Engineering Co. , Ltd. , Beijing 100840, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]中国核电工程有限公司,北京100840 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《上海金属》2018年第3期64-68,72,共6页Shanghai Metals

基　　金：国家自然科学基金(No.51174026)

摘　　要：通过高频感应炉冶炼试验研究了冶炼工艺、合金元素对铸钢中氮含量的影响。结果表明,冶炼工艺和合金元素含量对铸钢中氮含量影响较大。氮化铬铁合金呈颗粒状且尺寸为2~4 mm时,氮气溢出量小;增加高温相变区冷却速率可减小氮气逸出,增加铸钢中氮含量;减少搅拌和熔炼时间可增加铸钢中氮含量。通过修正合金元素对铸钢中氮的相互作用系数,建立了常压熔炼Mn-Cr系高氮奥氏体不锈钢的氮含量预测模型(w_(Mn)=11.8%~20.7%,w_(Cr)=16.5%~27.5%,w_C≤0.330%;常压熔炼,熔炼温度为1 550~1 600℃),氮含量的预测结果与实测值吻合较好。The effects of smelting process and alloying elements on the nitrogen content of cast steel were investigated. It was suggested that the nitrogen content is determined by both smelting process and alloying element content of the steel. The emission of nitrogen gas lessened when the nitride ferrochrome alloy exsited in granular form and in the size of 2 mm to 4 mm during smelting process. With the increase in cooling rate during high temperature phase transformation,the emission of nitrogen gas lessened,so the nitrogen content of cast steel increased. With the decrease in stirring and smelting time,the nitrogen content increased too. The coefficients of interaction between alloying elements such as Cr,Ni,Mn and nitrogen were analyzed in cast steel. A predictive model about nitrogen content was established for the cast high nitrogen Mn-Cr austenitic stainless steel under normal atmosphere state,i. e.,（ the mass fraction of Mn was 11. 8% to 20. 7%,that of Cr was16. 5% to 27. 5%,and that of C was equal to or less than 0. 330%; the melting temperature was from 1 550 ℃ to 1 600 ℃ for atmospheric melting）. The predicted results of nitrogen content were in good agreement with the measured values.

关 键 词：高氮奥氏体不锈钢 预测模型 冶炼工艺 合金元素 

分 类 号：TF764.1[冶金工程—钢铁冶金]