高氮奥氏体钢中氮析出和溶解的热力学与动力学研究

常压下氮在钢中的溶解度遵循Sieverts定律,溶解度较低(通常低于0.3%),因此,在高氮钢的冶炼中,如何提高氮含量成为了研究的焦点。本文介绍了氮在高氮奥氏体钢中的作用,分析了氮在高氮钢中析出和溶解的热力学原理,为增压提高氮含量的措施提供了理论基础;同时分析了其动力学原理,探讨了钢液吸氮和脱氮的限制性环节。此外,本文还从微观角度,即从形核机理阐述了高氮奥氏体钢氮析出和溶解的新的研究方向。

THERMODYNAMIC AND DYNAMIC RESEARCH ON NITROGEN PRECIPITATION FROM AND SOLUTION INTO THE HIGH NITROGEN AUSTENITE STEEL

The solubility of nitrogen sure, and is relatively low （generally in the steel follows the Sieverts principle in the atmospheric pres- speaking, lower than 0.3% ）, therefore, in the process of melting the high nitrogen steel, how to increase the nitrogen content becomes the focus. This paper has introduced the effects of the nitrogen in the high nitrogen austenite steel, analyzed the thermodynamic principle of the nitrogen precipitation from and solution into the high nitrogen austenite steel, which will provide theoretical foundations for the pressuring measures to increase the nitrogen content. The dynamic principle has also been analyzed, including the restricted links of the nitrogen absorption and desorption in the molten steel. Furthermore, from a microcosmic view, i.e. nucleation principle, this paper has expounded a new orientation of researching the nitrogen precipitation from and solution into the high nitrogen austenite steel.