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为了解决37Mn5连铸圆坯皮下裂纹问题,采用FCA方法和全程间接耦合法建立了连铸圆坯热力耦合模型,并结合现场数据,模拟分析了铸坯传热行为和应力分布,揭示了铸坯缺陷产生的原因,提出了相应的改进措施,为优化生产工艺提供了理论依据。结果表明,将原二冷各段水量分配比例调整为18∶28∶30∶24后,铸坯表面最大回温由原来的185℃降至8℃,铸坯表面的最大总应变较优化前降低了0.00067,消除了连铸坯皮下裂纹缺陷,铸坯质量得到明显改善。
In order to solve the sub-surface crack problem of 37Mn5 continuous casting round billet, the thermal coupling model of continuous casting round billet was established by FCA method and the whole indirect coupling method. Combined with the field data, the heat transfer behavior and stress distribution of the billet were simulated and analyzed. The reasons for the defects, put forward the corresponding improvements to provide a theoretical basis for optimizing the production process. The results showed that after the proportion of water in the first cooling section was adjusted to 18:28:30:24, the maximum temperature of the slab decreased from 185 ℃ to 8 ℃, and the maximum total strain on the slab surface was lower than that before optimization 0.00067, eliminating the sub-surface slab crack defects, slab quality has been significantly improved.