Thermodynamic Calculation and Experimental Research on Nitrogen Solubility in Austenite Stainless Steel

Special Steel ›› 2010, Vol. 31 ›› Issue (5): 1-4.

Thermodynamic Calculation and Experimental Research on Nitrogen Solubility in Austenite Stainless Steel

Shen Chunfei^1,2 , Jiang Xingyuan² , Li Yang¹ , Li Shuangjiang¹ , Yin Shiyou¹ , Jiang Zhouhua¹

1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110004；
2. Stainless Steel Business Unit, Baoshan Iron and Steel Co Ltd, Shanghai 200431；

Received:2010-04-19 Online:2010-10-01 Published:2022-11-10

奥氏体不锈钢中氮溶解度的热力学计算和实验研究

沈春飞^1,2，蒋兴元²，李阳¹，李双江¹，尹世友¹，姜周华¹

1. 东北大学材料与冶金学院，沈阳 110004 ；
2. 宝钢股份有限公司不锈钢事业部，上海 200431 ；

作者简介:沈春飞(1968-)，男，博士研究生,高级工程师，1991年北京科技大学毕业，不锈钢冶炼技术研究和产品质量控制。

Abstract

Abstract: The solubility of nitrogen in solid stainless steel 304, 304L, 301S and 301L (γ-phase) and in melts of austenite stainless steel has been calculated by using thermodynamic analysis method to get computational model for solubility of nitrogen in the steels, and the experimental research on nitriding behavior in four austenite stainless steels has been carried out by 1 kg MoSi electric resistance furnace with 33-100 kPa at 1520 ~1580 ℃. Results show that the solubility of nitrogen in y- phase in solid austenite stainless steels is highest; in cooling and solidifying process at normal pressure there is a transformation process from liquid phase, δ-phase to γ-phase; the nitrogen content in austenite steel shall decrease if supersaturated nitrogen to 8- phase in melt of stainless steel precipitates as gas bubble, so it is available to melt high nitrogen austenite stainless steel by using quick cooling at normal pressure or pressurized casting.

Key words: Austenite Stainless Steel, Nitroge Solubility, Themodynamic Calculation, Nitriding Experiment

摘要： 采用热力学分析方法,对固态不锈钢304、304L、301S和301L(γ-相)以及奥氏体不锈钢熔体中氮溶解度进行了计算,得出了氮溶解度的计算模型;同时通过1 kg MoSi电阻炉对4种奥氏体不锈钢在1520～1580℃和33～100 kPa压力下的渗氮行为进行了实验研究。结果表明,氮在固态奥氏体不锈钢的γ-相中的溶解度最高;在常压冷却、凝固过程中存在的液相、δ-相至γ-相的转变;当不锈钢熔体中相对于δ-相过饱和的氮在钢中以气泡形式析出,则降低了奥氏体钢的氮含量,所以采用常压快速冷却或加压浇注有利于冶炼高氮奥氏体不锈钢。

关键词: 奥氏体不锈钢, 氮溶解度, 热力学计算, 渗氮试验

Shen Chunfei , Jiang Xingyuan , Li Yang , Li Shuangjiang , Yin Shiyou , Jiang Zhouhua. Thermodynamic Calculation and Experimental Research on Nitrogen Solubility in Austenite Stainless Steel[J]. Special Steel, 2010, 31(5): 1-4.

沈春飞, 蒋兴元, 李阳, 李双江, 尹世友, 姜周华. 奥氏体不锈钢中氮溶解度的热力学计算和实验研究[J]. 特殊钢, 2010, 31(5): 1-4.

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