摘要
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.
An industrial experiment was carried out to study the evolution of billet surface porosity in hot rolling of round steel.Holes were drilled at the head of a billet. Linear cracks were spot at the surface of rolled round steel in parallel. Slight decarburization appears around these cracks,which can be seen from the metallograph. Crack measurement results show that the crack depth is mainly influenced by the hole depth. When the hole depth exceeds 4 mm,serious cracks will be generated on the round steel. The crack length is mainly dependent on the hole diameter. When the hole diameter ranges from 1 to 2. 5 mm,the crack length limits to 2 to 8 cm.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2014年第S1期10-14,共5页
Chinese Journal of Engineering
基金
中央高校基本科研业务费资助项目(FRF-TP-13-004A)
关键词
钢坯
热轧
表面缺陷
多孔性
裂纹
钻孔实验
steel billets
hot rolling
surface defects
porosity
cracks
drilling experiment
