Study of the Effect of Carbon on the Contraction of Hypo-Peritectic Steels during Initial Solidification by Surface Roughness

Pu, Dazhi; Wen, Guangrui; Fu, Dachao; Tang, Ping; Guo, Jianhua

doi:10.3390/met8120982

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…Одержаний результат можна пояснити тим, що за даного вмісту Карбону, Манґану та Силіцію в криці можливе співіснування фаз L, γ та δ; але за метастабільною діяграмою співіснування L + γ + δ можливе в інтервалі 10−20C та протягом 0,05 с, тобто майже миттєво [10], та цього часу достатньо, щоб встигли сформуватися «зморшки шерсткости».…”

Section: результати та обговоренняunclassified

“…та Силіцію ≥ 0,45% (мас.) (зразок № 3) в поверхневій зоні спостерігали утворення більш однорідних і дисперсних дендритів, що мали меншу дефектність у порівнянні з дендритами зразків № 1 і № 2, а на їхній поверхні не спостерігали утворення деформаційних полос, що можна пояснити тим, що з розтопу відбувається утворення γ-кристалів заліза [9][10][11] (рис. 1, в).…”

Section: результати та обговоренняunclassified

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Influence of the Carbon, Manganese, and Silicon Content on Formation of Structural Components During Continuous Casting of Steels

Filonenko,

Babachenko,

Kononenko

2024

Metallofiz. Noveishie Tekhnol.

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Манґану та Силіцію: в кірковій зоні та на 1/2 радіюса злитку сеґреґацію Манґану до 0,7% (мас.) і Силіцію до 0,5% (мас.), а в центральній частині злитку вміст буде майже таким, як їхній вміст у стопі.Ключові слова: безперервно литі криці, дендрити заліза, сеґреґація Манґану та Силіцію.The study of continuously cast steels with different contents of carbon, manganese and silicon is carried out in the work. To determine the features of the structural state of steels, we use microstructural analysis, x-ray microanalysis, and x-ray diffraction method. As shown, depending on the carbon, manganese, and silicon contents in the structure during solidification, the next development is possible as follows: formation of the primary phase of δferrite and, then, formation of γ-iron according the peritectic reaction; coexistence of L-, γand δ-phases, and formation of γ-iron from the melt. As found, with an increase in the carbon content ≥ 0.5 wt.%, manganese content ≥ 0.75 wt.% and silicon content ≥ 0.45 wt.% in steel, formation of the δferrite primary phase from the melt in the continuous cast steel billet does not occur. At given content of carbon, manganese and silicon in the steel, formation of γ-iron in the melt and increase in the quantity of inclusions, namely, complex carbides and iron silicides, are observed. Calculations show that, with an increase in the manganese and silicon contents, the peritectic area in the diagram decreases. In the interdendritic space, the segregation of manganese and silicon is detected: in the crust zone and at the 1/2 radius of ingot, the segregation of manganese is up to 0.7 wt.% and the silicon one is up to 0.5 wt.%; in the central part of ingot, the content will be almost the same as in the alloy.

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Section: результати та обговоренняunclassified

Influence of the Carbon, Manganese, and Silicon Content on Formation of Structural Components During Continuous Casting of Steels

Filonenko,

Babachenko,

Kononenko

2024

Metallofiz. Noveishie Tekhnol.

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“…At present, it is difficult to analyze the peritectic transformation contraction occurring in the mushy zone with cooling rates through a mathematical model or direct measurements. Therefore, to predict the crack susceptibility of steels, the surface roughness method was used to analyze the peritectic transformation contraction and crack susceptibility of steels during initial solidification. The principle is that wrinkles (surface roughness) on the surface of solidified steels exhibit a linear relationship with the contractional strain resulting from the phase transition .…”

Section: Crack Susceptibility Analysismentioning

confidence: 99%

Analysis of Crack Susceptibility of Peritectic Steels Based on Surface Roughness

Guo

Wen

Tang

et al. 2019

steel research int.

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Surface longitudinal cracking during solidification is a serious defect in the continuous casting of peritectic steels, which is dictated by the alloy composition and the cooling rate. Herein, to analyze the crack susceptibility of steels, surface roughness (R a ), which is determined by the peritectic transformation contraction, is proposed to evaluate the cracking tendency of steels. First, the solidified surface roughness of some steels is obtained by a high-temperature laser scanning confocal experiment under different cooling rates, and then the calculation formula and the criteria for surface roughness are obtained by data analysis. The results show that the peritectic transformation contraction and crack susceptibility reflected by surface roughness vary significantly with alloy compositions and cooling rates. In comparison with other methods, this method successfully contains the effect of alloy compositions and cooling rates on crack susceptibility. Good agreement between the predicted results and the experimental observations indicates that the crack susceptibility of steels can be evaluated reliably using their surface roughness.

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Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets

Lü

Zhang

Bao

et al. 2021

steel research int.

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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.

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Study of the Effect of Carbon on the Contraction of Hypo-Peritectic Steels during Initial Solidification by Surface Roughness

Cited by 7 publications

References 26 publications

Influence of the Carbon, Manganese, and Silicon Content on Formation of Structural Components During Continuous Casting of Steels

Influence of the Carbon, Manganese, and Silicon Content on Formation of Structural Components During Continuous Casting of Steels

Analysis of Crack Susceptibility of Peritectic Steels Based on Surface Roughness

Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets

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