论文部分内容阅读
亚包晶钢连铸过程中常出现表面纵裂质量问题,与其在结晶器内较大高温相变收缩引起的初生坯壳不均匀生长密切相关,其纵裂纹敏感性可由包晶特征点计算出的包晶转变率判定。利用Factsage热力学计算软件研究钢种常见合金元素对Fe-C二元平衡相图中包晶特征点的影响,回归得到包晶特征点的预测公式。基于预测公式,可准确判断一定成分钢种的亚包晶范围,从而指导实际连铸生产中保护渣的选择。研究表明,通过合理的成分微调可有效降低包晶转变率,降低亚包晶钢高温相变收缩程度,甚至改变凝固模式变为过包晶模式,从而大大降低连铸坯纵裂纹敏感性。
Subgrain ingot casting process often appear longitudinal surface cracking quality problems, and its high temperature in the mold phase shrinkage caused by the uneven growth of the primary shell is closely related to the longitudinal crack susceptibility can be calculated from the peritectic features Percavity change rate judgment. Factsage thermodynamic calculation software was used to study the influence of common alloying elements on the peritectic characteristic points in the Fe-C binary equilibrium phase diagram, and the prediction formula of the peritectic characteristic points was obtained by regression. Based on the prediction formula, the sub-peritectic range of certain steel grades can be accurately judged so as to guide the choice of mold flux in the actual continuous casting. The results show that the fine-tuning of the composition can effectively reduce the rate of peritectic transformation, reduce the degree of high temperature transformation and shrinkage of sub-peritectic steel, and even change the solidification mode to over-peritectic mode, which can greatly reduce the longitudinal crack susceptibility of slab.