热芯大压下轧制厚板坯缩孔及表面开裂的数值模拟

doi:10.12068/j.issn.1005-3026.2021.07.001

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (7): 913-919.DOI: 10.12068/j.issn.1005-3026.2021.07.001

• 材料与冶金 • 下一篇

热芯大压下轧制厚板坯缩孔及表面开裂的数值模拟

李天祥，李海军，王昭东，王国栋

(东北大学轧制技术及连轧自动化国家重点实验室，辽宁沈阳110819)

修回日期:2020-12-04 接受日期:2020-12-04 发布日期:2021-07-16
通讯作者: 李天祥
作者简介:李天祥(1990-)，男，河北唐山人，东北大学博士研究生；王昭东(1968-)，男，安徽淮南人，东北大学教授，博士生导师；王国栋(1942-)，男，辽宁大连人，东北大学教授，博士生导师，中国工程院院士.
基金资助:
国家重点研发计划项目(2017YFB0304603).

Numerical Simulation of Shrinkage Porosities and Surface Cracks of Slab with Hot-Core Heavy Reduction Rolling

LI Tian-xiang， LI Hai-jun， WANG Zhao-dong， WANG Guo-dong

State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.

Revised:2020-12-04 Accepted:2020-12-04 Published:2021-07-16
Contact: LI Hai-jun
About author:-
Supported by:
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摘要/Abstract

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.

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

Abstract: 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.

Key words: hot-core heavy reduction rolling; conventional hot rolling; void closure; rolling crack; numerical simulation

中图分类号:

TG335.5⁺1

李天祥，李海军，王昭东，王国栋. 热芯大压下轧制厚板坯缩孔及表面开裂的数值模拟[J]. 东北大学学报（自然科学版）, 2021, 42(7): 913-919.

LI Tian-xiang， LI Hai-jun， WANG Zhao-dong， WANG Guo-dong. Numerical Simulation of Shrinkage Porosities and Surface Cracks of Slab with Hot-Core Heavy Reduction Rolling[J]. Journal of Northeastern University(Natural Science), 2021, 42(7): 913-919.

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热芯大压下轧制厚板坯缩孔及表面开裂的数值模拟

Numerical Simulation of Shrinkage Porosities and Surface Cracks of Slab with Hot-Core Heavy Reduction Rolling

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