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以国内某厂65Mn矩形坯为研究对象,建立了矩形坯的传热和热弹塑性模型,模拟矩形坯凝固过程的温度场,以及在进行单点矫直时矫直点处的应力场分布情况;分析温度场及热应力的分布对铸坯质量的影响,为优化连铸工艺提高矩形坯的质量提供了理论依据。模拟结果表明:采用普碳钢工艺浇铸65Mn钢时,在矫直点还存在大量液芯,高拉速下铸坯处于带液芯矫直,较全凝固矫直而言,其应力云图出现了不规则分布,且应力梯度增大,大大增加了内裂的产生几率。通过对工艺优化前后的铸坯低倍进行对比分析发现,本研究所提出优化工艺方向合理,铸坯质量大幅提高,取得较好的实践效果。
Taking a 65Mn rectangular billet of a domestic factory as the research object, the heat transfer and thermo-elastic plastic model of the rectangular billet was established to simulate the temperature field during the solidification of the rectangular billet and the distribution of the stress field at the straightening point during single-point straightening The influence of temperature field and thermal stress distribution on slab quality was analyzed, which provided a theoretical basis for optimizing the continuous casting process to improve the quality of rectangular slab. The simulation results show that there is still a large number of liquid cores at the straightening point when the 65Mn steel is cast by the general carbon steel process. The straightening of the slab at the high pulling speed is straightened with the liquid core. Compared with the full coagulation straightening, the stress cloud image appears Irregular distribution, and the stress gradient increases, greatly increasing the probability of occurrence of internal fissures. By comparing and analyzing the low times before and after the process optimization, it is found that the optimization process direction proposed in this study is reasonable, the quality of the slab greatly improved, and achieved good practical results.