Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets,Steel Research International

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Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets
Steel Research International ( IF 1.9 ) Pub Date : 2021-03-27 , DOI: 10.1002/srin.202100035
Lidong Xing ₁ , Zefeng Zhang _{1,

2} , Yanping Bao ₁ , Botao Chen ₃ , Fanzheng Zheng ₃ , Min Wang ₁

Affiliation

Due to the development of continuous casting technology, the incidence of cracks in the continuous casting process has been significantly reduced. However, a few small cracks still appear during the continuous casting of special steel. For instance, cracks often appear at the corner of the billet during the production of hypoperitectic microalloyed steel. Most research on the causes of corner cracks in hypoperitectic microalloyed steel has focused on investigating the hot ductility of steel and not considered the shrinkage characteristics during solidification. Herein, the hot ductility behavior show that cracks are not related to the hot brittleness of steel. The effects of alloy composition on the phase evolution and shrinkage of steel during solidification are focused. Uneven solidification leads to excessive shrinkage of the corners in the billet, and an air gap is generated between the billet and the mold. The return of temperature in the corner of the billet results in the coarseness of the corner grain. Abnormal solidification also results in the severe deformation of the billet, leading to severe wear with the mold, causing Cu to infiltrate into the billet, and further increasing the crack sensitivity of the steel.

中文翻译：

亚包晶微合金钢坯角裂的成因

由于连铸技术的发展，连铸过程中裂纹的发生率已显着降低。但是，在特钢连铸过程中仍会出现一些小裂纹。例如，在亚包晶微合金钢生产过程中，钢坯边角处经常出现裂纹。大多数关于亚包晶微合金钢角部裂纹原因的研究都集中在研究钢的热延展性上，而没有考虑凝固过程中的收缩特性。在此，热延性行为表明裂纹与钢的热脆性无关。重点研究了合金成分对钢在凝固过程中的相变和收缩的影响。凝固不均导致坯料角部收缩过大，坯料与模具之间产生气隙。坯料角部的温度回升导致角部晶粒粗大。异常凝固还会导致钢坯剧烈变形，导致与模具严重磨损，导致Cu渗入钢坯中，进一步增加钢的裂纹敏感性。

更新日期：2021-03-27

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