Formation and Control of Transverse Corner Cracks in the Continuous Casting Slab of a Microalloyed Steel,Steel Research International

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Formation and Control of Transverse Corner Cracks in the Continuous Casting Slab of a Microalloyed Steel
Steel Research International ( IF 1.9 ) Pub Date : 2021-01-13 , DOI: 10.1002/srin.202000649
Yadong Wang ₁ , Qiang Ren ₂ , Lifeng Zhang ₃ , Xiaogang Yang ₄ , Wen Yang ₁ , Ying Ren ₁ , Haijie Zhang ₅

Affiliation

To investigate transverse corner cracks for a microalloyed steel continuous casting slab, the metallography, microtopography, and three-dimensional (3D) morphology of cracks are studied, respectively. High-temperature mechanical properties are investigated and compared from two positions where samples are extracted from both the slab corner and surface of the slab center. The thermal history of the slab is simulated and optimized experiments are conducted. Transverse corner cracks are generated on the valley of oscillation marks. Mold powder and wear elements of the mold are not detected. Microstructures are refined near the cracks. Cracks are generated in secondary cooling zones and the cracking temperature is higher than Ar₃ temperature. The extension path of cracks is not linear and cracks extend along the grain boundary. The third brittle temperature ranges (TBTR) are 764–832 °C and 793–808 °C in the two positions, respectively. The temperature at the slab corner in the bending and straightening zone falls into the brittle zone during the original water cooling condition, leading to the formation of cracks. The secondary cooling scheme is optimized to prevent the temperature at the slab corner in the bending and straightening zone from entering the TBTR, significantly reducing the occurrence of transverse corner cracks.

中文翻译：

微合金钢连铸板坯横向角裂纹的形成及控制

为了研究微合金钢连铸板坯的横向角裂纹，分别研究了裂纹的金相、显微形貌和三维 (3D) 形态。从板坯角部和板坯中心表面提取样品的两个位置对高温力学性能进行了研究和比较。模拟了板坯的热历史并进行了优化实验。在振荡痕迹的谷处产生横向角裂纹。未检测到模具的模具粉末和磨损元素。裂纹附近的微观结构被细化。二冷区产生裂纹，开裂温度高于Ar ₃温度。裂纹的扩展路径不是线性的，裂纹沿晶界延伸。第三脆性温度范围 (TBTR) 在两个位置分别为 764–832 °C 和 793–808 °C。弯曲矫直区板坯角部温度在原水冷条件下落入脆性区，导致裂纹的形成。优化二次冷却方案，防止弯曲矫直区板坯角部温度进入TBTR，显着减少横向角部裂纹的发生。

更新日期：2021-01-13

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