摘要
通过喷嘴性能测试、重熔凝固冷却实验和计算机仿真软件计算,研究了攀钢不同断面板坯角部冷却情况对铸坯角部横裂纹的影响.研究表明:对于1 160、1 080和1 250mm三个断面尺寸的铸坯,较强的冷却使角部温度较早低于A3温度,矫直前沿奥氏体晶界形成大量膜状先共析铁素体,矫直时容易沿奥氏体晶界形成角部横裂纹.为解决角部横裂纹问题,通过改变铸坯表层组织来控制铸坯角部横裂纹的产生,并将其应用于攀钢现场生产.
The effect of cooling conditions on the corner transverse cracks of slabs with different section dimensions was studied by nozzle performance measurements, remehing and solidification cooling experiments and numerical simulations. The results show that the corner temperature is lower than the A3 temperature earlier for slabs with section dimensions of 1000, 1 160 and 1 250 mm during a stronger cooling. There is a large number of film-like proeutectoid ferrite along grain boundaries, and transverse cracks form along prior austenite grain boundaries when straightening. To prevent from these transverse cracks, a process to control the surfaee mierostrueture of a slab was adopted and applied to actual production at Pansteel.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第3期296-301,共6页
Journal of University of Science and Technology Beijing
关键词
连铸
二次冷却
裂纹
微观组织控制
continuous casting
secondary cooling
cracks
microstructure control
