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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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csp变形过程中碳化铌析出的动力学模型
Abstract:
？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2s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57nm.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27nm,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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