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薄板坯連鑄連軋流程試制含釩鈦取向硅鋼中氮化物析出相

Nitride precipitates in grain-oriented silicon steel containing vanadium and titanium elements produced by thin slab casting and rolling process

  • 摘要: 通過熱力學計算與模擬試驗研究了含釩鈦取向硅鋼中氮化物析出相的析出規律與析出行為,并探討了含釩鈦元素的氮化物析出相作為薄板坯連鑄連軋流程制備取向硅鋼中輔助抑制劑的可行性.研究表明,在所冶煉的含釩鈦取向硅鋼的成分范圍內,TiN在鋼液凝固末期便具備析出的熱力學條件,而AlN與VN只可能在凝固后的α+γ或α+Fe3C兩相區內析出.含釩鈦取向硅鋼中氮化物析出相以成分復雜的復合析出相為主,且隨著釩鈦加入量的增加,鋼中抑制劑析出相總的分布密度由于含釩鈦元素的氮化物析出相的增加而明顯提高,使抑制劑抑制初次再結晶晶粒正常長大的能力得以加強,最終成品的磁感應強度值B8由1.857 T提升至1.898 T.同時,加入不高于0.007%的Ti與不高于0.005%的V不會影響中間脫碳退火工序的脫碳效果以及高溫退火凈化階段硫、氮的脫除效果,其形成的含釩鈦元素的納米級氮化物析出相適合作為薄板坯連鑄連軋流程制備取向硅鋼的輔助抑制劑.

     

    Abstract: The precipitation behavior of nitride precipitates in grain-oriented silicon steel containing vanadium and titanium elements produced by thin slab casting and rolling process was studied by thermodynamic calculation and simulation experiment. The feasibility of nitride precipitates containing V and Ti elements as auxiliary inhibitors was also investigated. It is found that TiN is likely to precipitate at the final stage of solidification in the grain-oriented silicon steel, but VN and AlN can precipitate only in the two-phase region after solidification. Nitride precipitates in the grain-oriented silicon steel are mostly compound precipitates with complex chemical composition. Meanwhile, with increasing V and Ti contents, the distribution density of total inhibitors is significantly improved due to the increase in amount of nitride precipitates containing V and Ti elements. The inhibiting ability of inhibitors which restrain the normal growth of primary recrystallization grains is strengthened, and the magnetic induction value of final product is upgraded from 1.857 T to 1.898 T. Moreover, the addition amount of V and Ti, which is not more than 0.005% and 0.007%, respectively, does not affect the decarburization effect and the removal of S and N elements; the formed nano-sized nitride precipitates containing V and Ti elements are suitable as auxiliary inhibitors in the grain-oriented silicon steel produced by thin slab casting and rolling process.

     

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