通过数值模拟研究连铸过程中大尺寸圆形 Bloom 的还原行为

Peng Lan, Liang Li, Yifan Lu, Haijie Wang, Hao Geng, Jiaquan Zhang
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摘要

凝固末端减薄是控制圆坯连铸过程中中心气孔的一种有效方法,但相关报道并不多。本研究针对 φ690 mm 连铸圆坯建立了传热和机械变形耦合的三维有限元模型,并通过表面温度、收缩区宽度、减径裂纹位置和变形轮廓形状进行了验证。研究发现,轧辊与大方坯的接触宽度随着减薄量的增加而增加,并近似呈抛物线关系。要覆盖整个收缩区范围,总减薄量不应小于 25 毫米,因为收缩区的宽度约为 120 毫米。随着总缩减量的增加,缩减过程中沿水平方向的隆起宽度也会增加,这种关系可以用抛物线方程来拟合。减薄量越大,收缩区的减薄厚度也越大,同样遵循抛物线关系。在陨石坑末端之前进行减径时,收缩区的变形更为明显。凝固前,φ690 毫米圆形大方坯的还原效率在 20-30% 之间,而凝固后大致在 12-20% 之间。它随着表观减薄量的增加而增加,这主要与应变速率的增加有关。比较了连铸和热轧表观减薄量为 30 mm 的 φ690 mm 圆形大方坯收缩区的变形。连铸中圆坯收缩区的等效应变约为 0.047 至 0.052,而热轧中的等效应变约为 0.031 至 0.036,表明前者的减薄效率约为后者的 1.5 倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reduction Behavior in Large-Sized Round Bloom During Continuous Casting by Numerical Simulation

Reduction Behavior in Large-Sized Round Bloom During Continuous Casting by Numerical Simulation

Solidification end reduction is an effective approach to control the central porosity during continuous casting of round bloom, although it is not widely reported. In the present work, a three-dimensional finite element model has been developed with coupling heat transfer and mechanical deformation for a φ690 mm continuously cast round bloom, and verified by the surface temperature, shrinkage zone width, reduction crack location, and deformed contour shape. It is found that the contact width between roller and the bloom increases with the increase of reduction amount and approximately in a parabolic relationship. To cover the whole range of the shrinkage zone, the total reduction amount should not be smaller than 25 mm as the width of the shrinkage zone is about 120 mm. The bulge width along the horizontal direction during reduction increases as the total reduction amount increases, and the relationship can be fitted by a parabolic equation. The reduction thickness in the shrinkage zone is larger when the reduction amount is higher, and it also follows parabolic relationship. The deformation in the shrinkage zone is more obvious when the reduction is conducted before crater end. The reduction efficiency for φ690 mm round bloom before solidification is between 20 and 30 pct, while after solidification is roughly between 12 and 20 pct. It increases with the increase of apparent reduction amount, mainly related to the increase of the strain rate. The deformation of the shrinkage zone in φ690 mm round bloom with 30 mm apparent reduction in continuous casting and hot rolling has been compared. The equivalent strain in the shrinkage zone of the round bloom in continuous casting is about 0.047 to 0.052, while that in hot rolling is about 0.031 to 0.036, indicating the reduction efficiency of the former is about 1.5 times higher than the latter.

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