Numerical simulation of the deformation risk in thin slab continuous casting process with liquid core reduction  

作　　者：Zhida Zhang Jize Chen Cheng Ji Yutang Ma Miaoyong Zhu Wenxue Wang 

机构地区：[1]Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education,Shenyang 110819,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,China [3]China National Heavy Machinery Research Institute Co.,Ltd.,Xi’an 710018,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第5期1114-1127,共14页矿物冶金与材料学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52474355);the Liaoning Province Science and Technology Plan Joint Program(Key Research and Development Program Project),China(Nos.2022JH25/10200003 and 2023JH2/101800058).

摘　　要：The application of liquid core reduction(LCR)technology in thin slab continuous casting can refine the internal microstruc-tures of slabs and improve their production efficiency.To avoid crack risks caused by large deformation during the LCR process and to minimize the thickness of the slab in bending segments,the maximum theoretical reduction amount and the corresponding reduction scheme for the LCR process must be determined.With SPA-H weathering steel as a specific research steel grade,the distributions of tem-perature and deformation fields of a slab with the LCR process were analyzed using a three-dimensional thermal-mechanical finite ele-ment model.High-temperature tensile tests were designed to determine the critical strain of corner crack propagation and intermediate crack initiation with various strain rates and temperatures,and a prediction model of the critical strain for two typical cracks,combining the effects of strain rate and temperature,was proposed by incorporating the Zener-Hollomon parameter.The crack risks with different LCR schemes were calculated using the crack risk prediction model,and the maximum theoretical reduction amount for the SPA-H slab with a transverse section of 145 mm×1600 mm was 41.8 mm,with corresponding reduction amounts for Segment 0 to Segment 4 of 15.8,7.3,6.5,6.4,and 5.8 mm,respectively.

关 键 词：thin slab continuous casting liquid core reduction three-dimensional thermal-mechanical critical strain crack risk maxim-um theoretical reduction amount 

分 类 号：TF777[冶金工程—钢铁冶金]