Formation mechanism and control of transverse corner cracks in fine blanking steel

Zhang, Fujun; Yang, Shufeng; Li, Jingshe; Liu, Wei; Wang, Tiantian; Yang, Jingbo

doi:10.1016/j.jmrt.2022.03.042

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…An analysis of the technical literature [1][2][3][4][5][6][7][8][9][10] showed that despite a large number of studies on the quality of thin-sheet rolled products, the results are ambiguous and contradictory. There is no consensus on the source and causes of the formation of surface defects in rolled sheet metal.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet

I.K. Ibraev

2024

Eurasian phys. tech. j.

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This study aimed to elucidate the formation mechanisms of micro-macrostructural heterogeneities in the ingot's cortical zone and their transformation into surface defects during heating, plastic deformation, and rolling processes. The methodology and results of studying the macro-and microstructural and chemical heterogeneities of ingots and finished rolled sheets are presented. A comparative method of structural-concentration analysis of metal at theend-to-end metallurgical processing stage of ingot -slab -rolled sheets was developed. The technique utilizes metallographic methods to study the structure and perform qualitative analysis of non-metallic inclusions. The research findings indicate that the quality of the rolled sheet surface is predominantly determined by the physical heterogeneity of the ingot's crust zone, while the internal defects in thin rolled sheets are largely influenced by the contamination of the metal with non-metallic inclusions. A novel mechanism is proposed for the transformation of defects in the casting cortical zone into surface and internal defects in rolled sheets. This study contributes to a deeper understanding of the formation and transformation of defects during metal processing, enabling the development of strategies for improving the quality of rolled sheets. Additionally, the study highlights the importance of controlling the physical heterogeneity of the ingot's crust zone and minimizing non-metallic inclusion contamination to achieve high-quality rolled sheets.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet

I.K. Ibraev

2024

Eurasian phys. tech. j.

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Hot Ductility Evolution Mechanism of Titanium‐Bearing Microalloyed Steels

Liu

Zheng

et al. 2023

steel research int.

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Titanium‐bearing (Ti‐bearing) microalloyed steels have high strength and toughness by grain refinement effect of carbonitride precipitates. However, they can induce surface cracks of continuous casting slab when the Ti alloyed content is high. A microalloyed steel with Ti content (0.10–0.15 wt%) is carried out by thermalmechanical simulator over 600–1350 °C to analyze hot ductility evolution mechanism. Fracture surface morphology, phase transition, and behavior of precipitates of the tensile samples are investigated by experimental detection and thermodynamic calculation. The ductility–temperature curves show that the third brittle temperature range is 600–890 °C, which is mainly attributed to the thin proeutectoid ferrite film and precipitated titanium carbonitride particles, widening the embrittlement temperature ranges through of steel. In addition, the tensile samples at 890–1350 °C have good hot ductility, indicating the dynamic recrystallization of deformed austenite can trigger grain boundaries migration away from cracks and avoid the side effect of the Ti (C,N) particles on hot ductility. The first brittle temperature range of 1350 °C‐melting point is mainly ascribed to the partial melting of the grain boundaries with element segregation of sulfur and phosphorus, and microporosity loose among dendrites.

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Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

Zhu,

Cai

2023

steel research int.

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Microalloyed steel with Nb, V, Ti, and other alloying elements is one of the important steel grades in the steel industry. During continuous casting process, high occurrence rate of transverse corner cracks in slabs restricts the quality and efficiency of the production of microalloyed steel grades, and it has not been effectively solved for a long time. Herein, the research progress on the formation mechanism, influential factors, and typical control technologies of transverse corner cracks during slab continuous casting are reviewed. Considering high‐temperature solidification process of microalloyed steel, the control of growth of microstructures and the precipitation behavior of carbonitrides in slab corners are supposed to be the key to avoid transverse corner cracks during slab continuous casting.

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Formation mechanism and control of transverse corner cracks in fine blanking steel

Cited by 6 publications

References 16 publications

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet

Hot Ductility Evolution Mechanism of Titanium‐Bearing Microalloyed Steels

Formation Mechanism and Control Technology of Transverse Corner Cracks During Slab Continuous Casting of Microalloyed Steels

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