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分别选取西钢某厂实际生产中易发生内部角裂缺陷的40Cr和45钢连铸坯为研究对象,通过对缺陷采用热酸浸低倍试验、金相法和探针能谱分析,发现缺陷处不存在明显的组织异常和质点沉淀。运用ANSYS软件对连铸结晶器凝固过程进行热模拟。研究结果表明,缺陷形成于结晶器内的凝固过程,根本原因是铸坯在结晶器中凝固传热不均导致出现铸坯偏角区热节区效应,从而诱导产生热应力,致使沿柱状晶晶间铁素体开裂,并伴随一定量的铸坯鼓肚现象。通过重新设定结晶器铜管圆角半径和优化生产部分工艺后,最终使连铸坯内部角裂评级在1.0级以上的比例下降到10.42%。
The 40Cr and 45 steel slabs which are easy to produce internal corner crack defects in the actual production of a certain plant in XiGang Iron and Steel were selected as the research objects. By using hot dip leaching test, metallographic method and energy dispersive spectroscopy analysis, it was found that the defects were not There are obvious tissue abnormalities and sedimentation. ANSYS software was used to simulate the solidification process of continuous casting mold. The results show that the fundamental reason that the defects are formed in the mold during the solidification process is due to the uneven heat transfer in the casting slab due to the uneven heat transfer in the mold, which induces the thermal stress, Intergranular ferrite cracking, and accompanied by a certain amount of slab bulging. By re-setting the corner radius of the mold copper tube and optimizing the production process, the ratio of the internal fissure in the continuous casting slab to grade 1.0 or above is finally reduced to 10.42%.