论文部分内容阅读
连铸坯角部横向裂纹是连续铸钢过程中经常出现的缺陷,直接影响钢材质量和生产成本。以AH36钢为研究对象,采用Gleeble-3800热模拟机模拟连铸坯冷却制度对连铸坯的影响。借助金相显微镜对断口微观组织进行分析表征,研究不同冷却温度下试样的热延展性,明确冷却温度对连铸坯角部横裂纹的影响。结果表明:以10℃/s的冷速冷却至650℃后,回温至Ac3温度以上随后再缓慢冷却至825℃时的试样断面收缩率为67.02%,并且微观组织均匀,晶粒细小。热循环冷却制度能够有效提高连铸坯表面热延展性,降低裂纹敏感性,消除角部裂纹的产生。
The transverse cracks in the corner of the continuous casting slab are the defects that often appear in the process of continuous casting, which directly affects the quality of the steel and the production cost. Taking AH36 steel as the research object, the influence of slab cooling system on slab was simulated by Gleeble-3800 thermal simulator. The microstructure of the fracture was characterized by metallographic microscope. The hot ductility of the specimens at different cooling temperatures was investigated. The influence of cooling temperature on the transverse crack in the corner of continuous casting slab was clarified. The results show that after the system is cooled to 650 ° C at a cooling rate of 10 ° C / s, the cross-sectional area shrinkage of the sample is 67.02% when the temperature is raised to above the Ac3 temperature and then slowly cooled to 825 ° C. The microstructure is even and the crystal grains are fine. Thermal cycle cooling system can effectively improve the surface of the slab hot ductility and reduce the crack sensitivity to eliminate the corner crack.