【作者】 童婷婷；

【导师】 马杰；

【作者基本信息】 西安建筑科技大学 ， 化学工艺， 2007， 硕士

【摘要】 长期以来，由于氮与各种脆性现象的不良效果有关，所以一直被炼钢工作者视为不利因素。但是近年来由氮与合金元素相互作用产生的一些有效效果受到极大重视，从而开发出许多高氮的钢种。本文结合我国微合金化资源的特点，根据近年来国内外在钒氮微合金化技术方面的研究成果，介绍了钒氮微合金化技术的研究及其在实际生产中的应用。高强度微合金钢中，氮与钒间的交互作用对提高钢材性能具有重要意义，为了准确控制钢中氮和钒的含量，多以氮化钒或氮化钒铁来实现合金化。本文用热力学方法，分析和讨论了以碳质和氢为还原剂还原钒氧化物制备金属钒和碳化钒，及其氮化过程的热力条件；对三元系几何模型进行了评价，利用统一溶液模型推导出三元系中组元活度相互作用系数预测的公式，并建立了CaO-FeO-SiO₂-V₂O₃四元渣系的活度模型。通过钒在钢中的热力学行为的分析，确定了钒微合金钢中碳氮化钒固溶量及化学组成。得出了影响钒收得率的因素主要是冶炼钢种成分、炉渣成分和渣量。并在钒微合金钢生产热轧三级钢筋中得到验证。为以后的生产提供有效的理论依据。更多还原

【Abstract】 For the relevancy of N to unfavored brittleness effects, it has being seen as ill factors by metallurgical circle for a long period, while this is changed by the development of high N steels on the basis of the understanding and focus on desired interacition of N with alloy-making elements. With a comprehensive overview on the status quo and the worldwide evolution of VN microalloying as introduction, this thesis deals with the study and application of VN microalloying.Interactive effects of Vanadium and Nitrogen plays an important role in improve performances of high strength low alloy steels （HSLAS）. The forms of VN, VCN, FeVN are introduced into HSLAS for accurate content control of V and N. Taking dynamics as main tools, the article is dedicated to the analyze and discussion of the preparation of V and VC from vanadium oxide with carbon and hydrogen as reduction reagents, and the themodynamics conditions for the nitrification of the sequent productions （V and VC）. New formulae for the calculations of AIC of components in ternary system the paper are established by uniform solution modeling on the basis of evaluations of geometric modeling for ternary system, which leads to the conclusion of the prominent feasibility of uniform solution modeling for analyze thermodynamic performance of ternary system. To expand the study, activity modeling for quaternary system of CaO-FeO-SiO₂-V₂O₃ of steel slag is deduced and main V recovery influencing factors is found in components of steel and slag, the slag ratio. The VCN content of solid solution form and chemical formula in vanadium microalloy steel is determined, and is verified in the production of the 3^rd class steel made of vanadium microalloy steel. The work will eventually facilitate practical production.更多还原