CAJ | 학술논문

系统研究了 Ti- IF 钢冶炼过程和铸坯中含 Ti 夹杂物的组成、分布与微观形貌,揭示了含 Ti 夹杂物的衍变规律。热力学分析和实验结果表明：在 IF 钢冶炼过程中无 TiN 生成,含 Ti 夹杂物的存在形式是以 TiO2为主的钛氧化物结合其他氧化物的复合夹杂；而在连铸凝固过程中,由于钢液温度降低和元素的偏析作用,TiN 夹杂以异质形核的方式生成。 IF 钢铸坯中非金属夹杂物主要是大尺寸 Al2 O3颗粒和存在中间过渡层的 TiN- Al2 TiO5- Al2 O3复合夹杂物,其形核长大过程是[Al]、[Ti]和[O]先在细小的 Al2 O3颗粒上反应生成一层 Al2 TiO5,然后 TiN 在 Al2 TiO5表面形核长大。根据连铸过程和铸坯中含钛夹杂物的研究得出,Ti- IF 钢铸坯中 TiN 夹杂难以去除,但是可以使其变性以实现对钢中含钛夹杂物的控制。
계통연구료 Ti- IF 강야련과정화주배중함 Ti 협잡물적조성、분포여미관형모,게시료함 Ti 협잡물적연변규률。열역학분석화실험결과표명：재 IF 강야련과정중무 TiN 생성,함 Ti 협잡물적존재형식시이 TiO2위주적태양화물결합기타양화물적복합협잡；이재련주응고과정중,유우강액온도강저화원소적편석작용,TiN 협잡이이질형핵적방식생성。 IF 강주배중비금속협잡물주요시대척촌 Al2 O3과립화존재중간과도층적 TiN- Al2 TiO5- Al2 O3복합협잡물,기형핵장대과정시[Al]、[Ti]화[O]선재세소적 Al2 O3과립상반응생성일층 Al2 TiO5,연후 TiN 재 Al2 TiO5표면형핵장대。근거련주과정화주배중함태협잡물적연구득출,Ti- IF 강주배중 TiN 협잡난이거제,단시가이사기변성이실현대강중함태협잡물적공제。
The composition, distribution and microtopography of titaniferous inclusions in Ti- IF steel during steelmaking and in the casting billets were investigated systematically, and the evolution of the titaniferous inclusions was described subsequently. Both thermodynamic analysis and experimental results indicate that TiN could not precipitate in the steelmaking process, while the titanifer-ous inclusions exist in the form of a combination of titanium oxides which mainly consists of TiO2 and other oxides. In the solidification process of continuous casting, TiN inclusions precipitate in the heterogeneous nucleation way due to the decrease of liquid steel temper-ature and the segregation effect. The main non-metallic inclusions in the casting billets are large size Al2 O3 particles and TiN- Al2 TiO5-Al2 O3 triple-layer complex inclusions with the middle layer of Al2 TiO5 . The nucleation and growth process of TiN- Al2 TiO5- Al2 O3 complex inclusions is that [Al], [Ti] and [N] form the middle layer of Al2 TiO5 firstly on the Al2 O3 core surface, then TiN nucleates and grows up on the Al2 TiO5 surface. Since TiN inclusions in the casting billets are difficultly removed during the steelmaking process, it is feasible to control titaniferous inclusions in the steel by inclusion modification.