摘要
为了研究连铸坯热芯大压下轧制工艺对铸坯内部缩孔和表面开裂的影响,以EH47船板钢为研究对象,利用数值模拟方法,对比研究了热芯大压下轧制和常规热轧的工艺效果.结果表明,热芯大压下铸坯厚向温度梯度更大,芯部应变水平和厚向变形均匀性提高;当压下量为50 mm时,热芯大压下轧后残余孔隙体积比常规工艺小18.4%;由于热芯大压下铸坯表面的应变速率和变形温度较低,导致其侧表面和角部的开裂风险大于常规轧制,但不会造成表面裂纹缺陷.
To study the effect of hot-core heavy reduction rolling(HHRR)process on internal shrinkage porosities and surface cracks of the slab,EH47 ship-plate steel was taken as a research material,and the processes of the HHRR and conventional hot rolling were analyzed and compared through numerical simulation.The results show that the temperature gradient along the thickness direction of slab becomes larger,and the strain level in the core region and the deformation uniformity along the thickness direction are improved in the HHRR process.When the reduction amount is 50 mm,the residual void volume after HHRR is 18.4%smaller than the conventional one.Due to the lower strain rate and deformation temperature on the slab surface during the HHRR,the cracking risk on the side surfaces and the corners is higher than the conventional one,however,it could not lead to the surface cracks.
作者
李天祥
李海军
王昭东
王国栋
LI Tian-xiang;LI Hai-jun;WANG Zhao-dong;WANG Guo-dong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第7期913-919,共7页
Journal of Northeastern University(Natural Science)
基金
国家重点研发计划项目(2017YFB0304603).
关键词
热芯大压下轧制
常规热轧
孔隙压合
轧制裂纹
数值模拟
hot-core heavy reduction rolling
conventional hot rolling
void closure
rolling crack
numerical simulation
