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对圆钢轧制过程中铸坯表面孔类缺陷演变规律进行了工业实验研究.实验中采用钻孔法在铸坯头部钻取一定直径和深度的孔的方法来模拟铸坯表面气孔缺陷.钻孔铸坯经轧制后在圆钢的对应位置发现了呈平行分布的表面直线型裂纹,裂纹处的金相组织发现裂纹四周有轻微的脱碳现象.裂纹测量结果表明,圆钢表面直线型裂纹深度主要受钻孔深度影响,当钻孔深度大于4mm时,会导致深度明显的裂纹.裂纹长度主要受钻孔直径影响,对于孔径在1.0~2.5mm的孔,形成的裂纹长度大都分布在2~8cm之间.
The experimental study on the evolution of the hole defects in the surface of the billet during the round bar rolling process was carried out.In the experiment, the hole diameter at the head of the billet was drilled to simulate the blowhole defects on the surface of the slab. After the rolling, the billets of the billets were found to be linearly cracked at the corresponding positions of the round bar, and the surface of the billets were found to be slightly decarburized around the cracks.The results of the crack measurements showed that the straight line The depth of crack is mainly affected by the depth of the hole, which will lead to obvious deep cracks when the drilling depth is more than 4mm. The crack length is mainly affected by the diameter of the hole. For the holes with the diameter of 1.0-2.5mm, the crack lengths are mostly distributed Between 2 ~ 8cm.