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材料研究学报  2007, Vol. 21 Issue (3): 250-254    
  论文 本期目录 | 过刊浏览 |
CSP变形过程中碳化铌析出的动力学模型
向嵩  刘国权  韩庆礼  王安东
引用本文:

向嵩; 刘国权; 韩庆礼; 王安东 . CSP变形过程中碳化铌析出的动力学模型[J]. 材料研究学报, 2007, 21(3): 250-254.

全文: PDF(635 KB)  
摘要: 本文在经典形核和长大理论模型的基础上,建立了适用于薄板坯连铸连轧(CSP)变形过程中NbC析出的动力学模型.该模型考虑了不同扩散速率原子的质量守恒、软撞击及毛细管效应,并假设碳化物主要在位错上析出,位错密度按照Atsuhiko模型计算.计算结果表明,在不发生软化行为的情况下,按照某实际CSP生产线生产工艺六道次变形后,Fe-0.046Nb-0.053C%(质量分数)钢的平均位错密度为3×1013m-2,开轧2 s后NbC开始析出.随着轧制过程的进行,NbC的最大半径逐渐增大,六道次轧制后最大半径为57 nm.随着轧制过程的进行、变形量的增大以及温度的降低,NbC的平均半径逐渐增大.轧制完成的瞬时钢中析出的NbC粒子的平均半径为27 nm,体积分数为0.0011%,后者远低于对应的平衡体积分数0.0496%.
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收稿日期: 1900-01-01     
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