Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (7): 913-919.DOI: 10.12068/j.issn.1005-3026.2021.07.001

• Materials & Metallurgy •     Next Articles

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   

  1. 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
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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

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