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<p>The three-dimensional geometry and distribution characteristic of oscillation mark(OM) on continuously cast slab surface for hypo-peritectic steel was experimentally measured. The width of OM ranged from 2.15 to 6.91 mm, and the depth ranged from 0.19 to 0.93&#xa0;mm. A positive relationship was found between OM depth and width. The OM spacing was within the range of 9.0 to 10.8 mm, fitting the theoretical value of 10 mm well. A thermal elastoplastic finite element model was established to analyze the deformation behavior during the straightening process in slab continuous casting, and it was verified by temperature from plant and critical strain from hot tensile test. The simulation results show that the tensile strain indeed concentrates at the bottom of OM, and it is around 5.64 pct in the valley of OM when the average value is achieved in the smooth matrix with a concentration index of 4.62 for the OM with 3 mm in width, 0.8 mm in depth, and 10 mm in spacing. The impact of OM width, depth, and spacing on the notch effect was numerically discussed. The strain concentration index decreases nonlinearly from 6.10 to 2.58 as OM width increases from 1 mm to 11 mm, and it increases from 1.63 to 5.36 as OM depth increases from 0.2mm to 1.2mm, while it decreases from 5.03 to 4.13 as OM spacing increases from 6 mm to 18 mm. The critical strain for the onset of the crack in hypo-peritectic microalloyed steel by hot tensile test was measured to be from 4.8 to 7.2 pct, with an enlargement factor between 4 and 6 to the theoretical straightening strain. It indicates that the formation of corner transverse crack in the slab is dominantly attributed to the strain concentration effect by OM.</p>

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Straightening Strain Concentration in Oscillation Mark During Slab Continuous Casting for Hypo-peritectic Microalloyed Steel

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Wenhao Chen,
  • Peng Lan,
  • Yingchun Wang,
  • Jiaquan Zhang

摘要

The three-dimensional geometry and distribution characteristic of oscillation mark(OM) on continuously cast slab surface for hypo-peritectic steel was experimentally measured. The width of OM ranged from 2.15 to 6.91 mm, and the depth ranged from 0.19 to 0.93 mm. A positive relationship was found between OM depth and width. The OM spacing was within the range of 9.0 to 10.8 mm, fitting the theoretical value of 10 mm well. A thermal elastoplastic finite element model was established to analyze the deformation behavior during the straightening process in slab continuous casting, and it was verified by temperature from plant and critical strain from hot tensile test. The simulation results show that the tensile strain indeed concentrates at the bottom of OM, and it is around 5.64 pct in the valley of OM when the average value is achieved in the smooth matrix with a concentration index of 4.62 for the OM with 3 mm in width, 0.8 mm in depth, and 10 mm in spacing. The impact of OM width, depth, and spacing on the notch effect was numerically discussed. The strain concentration index decreases nonlinearly from 6.10 to 2.58 as OM width increases from 1 mm to 11 mm, and it increases from 1.63 to 5.36 as OM depth increases from 0.2mm to 1.2mm, while it decreases from 5.03 to 4.13 as OM spacing increases from 6 mm to 18 mm. The critical strain for the onset of the crack in hypo-peritectic microalloyed steel by hot tensile test was measured to be from 4.8 to 7.2 pct, with an enlargement factor between 4 and 6 to the theoretical straightening strain. It indicates that the formation of corner transverse crack in the slab is dominantly attributed to the strain concentration effect by OM.