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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和拉断试样,借助金相显微镜对断口微观组织进行分析表征,研究不同冷却制度下试样的热延展性,明确冷却制度对连铸坯角部横裂纹的影响。结果表明:传统冷却制度下,试样在800℃时断面收缩率低于40%,断口呈脆性断裂,热塑性差,抗裂纹敏感性低,铁素体和珠光体组织分布不均匀,晶粒粗大析出物沿晶界产生并呈链状分布。热循环冷却制度条件下,试样在800℃时的断面收缩率为53.30%,并且微观组织均匀,晶粒细小,无链状析出物。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。
Taking AH36 steel as the research object, the Gleeble-3800 thermal simulator was used to simulate the slab cooling system and pull off the specimen. The microstructure of fracture was analyzed by metallographic microscope to study the hot ductility of the specimen under different cooling regimes. Clarifying the Influence of Cooling System on Corner Cracks in Continuous Casting Billet. The results show that under the traditional cooling regime, the specimen has a reduction of fracture area of less than 40% at 800 ℃, brittle fracture at fracture, poor thermoplasticity, low susceptibility to cracking, uneven distribution of ferrite and pearlite, coarse grains Precipitates are produced along the grain boundaries and are distributed in chains. Thermal cycling cooling system conditions, the sample at 800 ℃ when the cross-section shrinkage was 53.30%, and the microstructure uniform, fine grain, no chain-like precipitates. Thermal cycle cooling system can effectively improve the surface of the slab hot ductility and reduce the crack sensitivity to eliminate the corner crack.