Microstructure evolution and its influence on thermoplasticity of wide and thick continuous casting slab with heavy reduction

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外文摘要：After the heavy reduction(HR)process was carried out at the solidification end of the continuous casting slab,the austenite grains were refined by recrystallization,which improved the thermoplasticity of the slab.However,the reduction in deformation during the HR process initiated stress concentration at the slab surface,and the crack risk increased.To effectively evaluate the risk of slab surface cracks under these complex conditions,the effect of the HR on the austenite recrystallization and thermoplasticity of a microalloyed slab surface was investigated by 15-pass reduction thermal sim-ulation according to the wide and thick slab continuous casting process.The softening fraction was introduced as a global internal variable to quantitatively analyze various recrystallized re-refined grains.After the critical strain reaches the critical strain of dynamic recrystallization,a variety of recrystallization modes alternately occur.Among them,the contribution rate of dynamic crystallization to the later refinement reaches more than 50%.The contribution rates of static recrystallization and metadynamic recrystallization to grain refinement are almost the same.The thermoplasticity of the slab surface first increases and then decreases with increasing reduction pass.It was verified by transmission electron microscopy that the main reason for the decrease in thermoplasticity is that the dislocation multiplication rate increases,resulting in a sharp increase in stress and a decrease in thermoplasticity.

外文关键词：

Solidification end reductionContinuous castingWide and thick slabAustenite recrystallizationThermoplasticity

作者：

Tian-ci Chen、Xin Hu、Tan Zhao、Cheng Ji、Miao-yong Zhu

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作者单位：

State Key Laboratory of Metal Material for Marine Equipment and Application,Angang Steel Co.,Ltd.,Anshan 114021,Liaoning,China

School of Metallurgy,Northeastern University,Shenyang 110816,Liaoning,China

基金：

National Natural Science Foundation of ChinaApplied Basic Research Program of Liaoning ProvinceApplied Basic Research Program of Liaoning ProvinceApplied Basic Research Program of Liaoning ProvinceState Key Laboratory of Metal Material for Marine Equipment and Application Project

项目编号：

519740782022JH2/1013000022022JH25/10200003SKLMEA-K202204

出版年：

2024

DOI：

10.1007/s42243-024-01188-4

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(9)