连铸坯角部横向裂纹的形成机理与定量评估
MECHANISM OF THE INITIATION OF THE TRANSVERS CRACKS AND THEIR QUANTITY EVALUATION
摘 要
综述了连铸坯角部横向裂纹的产生及与其相关的因素。轧材表面纵向裂纹多数由连铸坯的横向裂纹引起的，研究认为，连铸坯的横向裂纹是结晶器温度在1 300℃左右时形成的超大原始奥氏体晶粒(直径>1mm)造成的。给出了断裂的定量判定公式。
表面裂纹
晶粒度
Continuous casting billet
Surface cracks
Grain size
Abstract
It is summarized in this paper the initiation of transvers carcks on continuous casting billet angles and its relative factors. Normally the longitudinal cracks were caused by transvers cracks on the angles. The study showed that the transvers cracks were caused by large prior-austenite grains (diameter >1mm) formation at about in 1 300℃. The quantity evaluation formula is also introduced in this paper.
中图分类号 TG260
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收稿日期 2006/5/30
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备注赵晗(1958-)，男，高级工程师，学士。
引用该论文: ZHAO Han,REN Yi-feng. MECHANISM OF THE INITIATION OF THE TRANSVERS CRACKS AND THEIR QUANTITY EVALUATION[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2006, 42(11): 565～568
赵晗,任一峰. 连铸坯角部横向裂纹的形成机理与定量评估[J]. 理化检验－物理分册, 2006, 42(11): 565～568
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参考文献
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【2】Rian Dippenaar, Suk-Chun Moon, Szekeres E S. Strand Surface Cracks -The Role of Abnormally Large Prior Austenite Grains[J］. Iron & Steel Technology Conference Proceedings AISTech, 2006,Ⅰ:833-845.
【3】McPherson N A, Mercer R E. Continuous casting of slabs at BSC Ravenscraig Works[J］. Ironmaking and Steelmaking, 1980,(4):167-179.
【4】Szekeres E S. A Review of Strand Casting Factors Affecting Transverse Cracking[A］. Proceedings of the 6th International Conference on Clean Steel, Balatonfüred, Hungary[C］. Ombke: Budapest, 2002.324-338.
【5】Wolf M. Intergranular Surface Cracks in Bloom Casting[J］. Trans ISIJ, 1984,24.
【6】Brian G Thomas. Simulation of Longitudinal off Corner Depressions on Continuously Cast Steel Slabs[J］. Iron and Steelmaker (ISS Transactions), 1996,23(4):57-70.
【7】周有预.宽板坯高拉速连铸的特点及铸坯缺陷的预防[J］.钢铁研究, 2003,135(6):35-37.
【8】蔡开科,程士富.连续铸钢原理与工艺[M］.北京:冶金出版社, 2005.263.
【9】蔡开科.连铸坯表面裂纹的控制[J］.鞍钢技术, 2004.3:1-8.
【10】Schmidt L, Josefsson A. On the Formation and Avoidance of Transverse Cracks in Continuously Cast Slabs from Curved Mould Machines[J］. Sc and J Metallurgy, 1974,5.
【11】Alvarez de Toledo G, Arteaga A, Laraudogoitia J J. Continuous casting of microalloyed steels. Influence of composition and operational parameters in billet surface cracking[J］. Materials Science Forum, 2005,500-501:163-170.
【12】Crowther D N, Mintz B. Effect of Boron on Hot Ductility of Nb-Containing steel[J］. Materials Science and Technology, 1986,2:671-676.
【13】Stüwe H P. The Plastic Work Spent in Ductile Fracture[C］. Three-dimensional Constitutive Relations and Ductile Fracture, 1981,213-221.
【14】Kolednik O. An Improved Procedure for Calculating COD from the Plastic Component of Clip-Gauge Displacement[M］. Defect Assessment in Components-Fundamentals and Applications, Mechanical Engineering Publications, London, 1991,285-297.
【15】Stampfl J, Scherer S, Berchthaler M, et al. Determination of the Fracture Toughness by Automatic Image Processing[J］. Int J Fract, 1996,78:35-44.
【16】Scherer S, Kolednik O A. New System for Automatic Surface Analysis in SEM[J］. Microscopy and Analysis, 2001,70:15-17.
【2】Rian Dippenaar, Suk-Chun Moon, Szekeres E S. Strand Surface Cracks -The Role of Abnormally Large Prior Austenite Grains[J］. Iron & Steel Technology Conference Proceedings AISTech, 2006,Ⅰ:833-845.
【3】McPherson N A, Mercer R E. Continuous casting of slabs at BSC Ravenscraig Works[J］. Ironmaking and Steelmaking, 1980,(4):167-179.
【4】Szekeres E S. A Review of Strand Casting Factors Affecting Transverse Cracking[A］. Proceedings of the 6th International Conference on Clean Steel, Balatonfüred, Hungary[C］. Ombke: Budapest, 2002.324-338.
【5】Wolf M. Intergranular Surface Cracks in Bloom Casting[J］. Trans ISIJ, 1984,24.
【6】Brian G Thomas. Simulation of Longitudinal off Corner Depressions on Continuously Cast Steel Slabs[J］. Iron and Steelmaker (ISS Transactions), 1996,23(4):57-70.
【7】周有预.宽板坯高拉速连铸的特点及铸坯缺陷的预防[J］.钢铁研究, 2003,135(6):35-37.
【8】蔡开科,程士富.连续铸钢原理与工艺[M］.北京:冶金出版社, 2005.263.
【9】蔡开科.连铸坯表面裂纹的控制[J］.鞍钢技术, 2004.3:1-8.
【10】Schmidt L, Josefsson A. On the Formation and Avoidance of Transverse Cracks in Continuously Cast Slabs from Curved Mould Machines[J］. Sc and J Metallurgy, 1974,5.
【11】Alvarez de Toledo G, Arteaga A, Laraudogoitia J J. Continuous casting of microalloyed steels. Influence of composition and operational parameters in billet surface cracking[J］. Materials Science Forum, 2005,500-501:163-170.
【12】Crowther D N, Mintz B. Effect of Boron on Hot Ductility of Nb-Containing steel[J］. Materials Science and Technology, 1986,2:671-676.
【13】Stüwe H P. The Plastic Work Spent in Ductile Fracture[C］. Three-dimensional Constitutive Relations and Ductile Fracture, 1981,213-221.
【14】Kolednik O. An Improved Procedure for Calculating COD from the Plastic Component of Clip-Gauge Displacement[M］. Defect Assessment in Components-Fundamentals and Applications, Mechanical Engineering Publications, London, 1991,285-297.
【15】Stampfl J, Scherer S, Berchthaler M, et al. Determination of the Fracture Toughness by Automatic Image Processing[J］. Int J Fract, 1996,78:35-44.
【16】Scherer S, Kolednik O A. New System for Automatic Surface Analysis in SEM[J］. Microscopy and Analysis, 2001,70:15-17.
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