Analysis of Crack Susceptibility of Peritectic Steels Based on Surface Roughness

Guo, Jianhua; Wen, Guangrui; Tang, Ping; Fu, Jiaojiao; Gu, Sijia

doi:10.1002/srin.201900376

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…Схильність криць до розтріскування сильно залежить від складу стопу та параметрів процесу виготовлення злитку, таких як швидкість охолодження. В результаті перитектичного перетворення виникає некогерентність меж фаз (до 6%) між δ-феритом та аустенітом; крім того, ці фази мають різну теплопровідність, що сприяє утворенню тріщин під час безперервного лиття [3]. Окрім наведених вище причин, є ще різні пояснення утворення тріщин під час затвердіння криці за безперервного лиття: максимальна термічна усадка зміщується вліво зі збільшенням переохолодження [4]; коли виникає напруження або деформація стиснення затверділої оболонки, що перевищує критичне значення міцности на розрив та інші [1−3].…”

Section: вступunclassified

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: вступunclassified

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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“…Based on the phase diagram of the Fe-C alloy, influence of alloy elements, and continuous cooling process, the pseudobinary phase diagram of the steel used in this experiment was drawn using the Factsage software, [12,14,18] as shown in Figure 7a. It can be seen that the temperature of peritectic transformations is lower than T Perit , and the starting and ending temperatures of the peritectic reaction are not the same, which are 1493 and 1448 C, respectively.…”

Section: Relationship Between Corner Cracks and Solidification Characteristics Of Steelmentioning

confidence: 99%

“…[16,17] Uneven solidified billet shells and mismatches in the contraction coefficients lead to the accumulation of stress. [18] When the stress sustained by the billet is greater than the ultimate stress it can withstand, microcracks will form in the billet. [19] In this study, the causes of the cracks in the corners of the hypoperitectic microalloyed steel billet are analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

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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“…It was found that the surface roughness of the peritectic steels was higher and the surface roughness changed with cooling rate. [19] The surface roughness however may not predict shell thinning that could lead to a catastrophic break-out during continuous casting of steels. In other words, complete thickness measurement of the entire surface area of the shell could be necessary.…”

Section: Shell Thickness Measurementsmentioning

confidence: 99%

Shell Measurements and Mold Thermal Mapping Approach to Characterize Steel Shell Formation in Peritectic Grade Steels

Balogun

Roman

Gerald

et al. 2021

steel research int.

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Herein, the prospects of detecting peritectic behavior in carbon steels (Fe–C) using solidified shell thickness measurements and real‐time mold thermal maps are investigated. Irregular steel shell thickness and localized shell thinning are negative conditions associated with the peritectic transformation in many steel grades. Detailed three dimensional (3D) thickness maps are generated to directly contrast peritectic from nonperitectic solidification features using a laboratory dip test. Characterization of the steel shell also includes measurement of 3D shell surface deviations from a nominally flat surface. The unevenness parameter, which is calculated using the coefficient of variation in shell thickness as a function of the carbon content in the steel, clearly peaks around 0.14%C. A distributed fiber‐optic sensor, embedded 1 mm from the working face of a 100 × 55 × 12 mm3 thick copper chill block, has been used to obtain real‐time mold thermal maps of the solidification event during immersion of the block into molten steel. A programmable drive is used to control the motion of the chill block during immersion into a steel bath to minimize variability in immersion speed, position, and time. The thermal mapping measurements are well correlated with the shell profile measurements.

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Analysis of Crack Susceptibility of Peritectic Steels Based on Surface Roughness

Cited by 12 publications

References 25 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

Causes of Corner Cracks in Hypoperitectic Microalloyed Steel Billets

Shell Measurements and Mold Thermal Mapping Approach to Characterize Steel Shell Formation in Peritectic Grade Steels

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