Generation Mechanism of Unevenness of Ultra Low Carbon Steel at Initial Stage of Solidification

Mizukami, Hideo; Yamanaka, Akihiro

doi:10.2355/isijinternational.50.435

Cited by 17 publications

(9 citation statements)

References 26 publications

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“…In the continuous casting of peritectic steels (i.e., approximately 0.1-0.18 mass% C), the surface quality is crucial [1][2][3][4][5][6][7]. Surface depressions (i.e., unevenness of the solidifying shell) are known to arise during the early stages of solidification within molds for peritectic carbon steel [1,2].…”

Section: Introductionmentioning

confidence: 99%

In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell

Yasuda

Narumi

Katsube

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In the continuous casting of peritectic steels, unevenness and cracks of the solidifying shell are typical casting defects. This study focuses on the ferrite–austenite transformation and the influence of the transformation on the solidifying shell deformation. In situ observations revealed that the austenite hardly nucleated and, consequently, the undercooled ferrite massively transformed to the austenite in the solid state. Simultaneously, the austenite rapidly solidified in the remaining liquid. The volume changes due to the ferrite–austenite transformation and the solidification shrinkage were measured using time-resolved tomography. On the basis of the observations and measurements, a model that includes the ferrite–austenite transformation and the austenite solidification was proposed to evaluate the volumetric strains in the solidifying shell. There was a sharp peak in the volumetric strains derived from the model at hypo-peritectic compositions. This work demonstrates the need to include the ferrite–austenite transformation in the solid state and the rapid austenite solidification for understanding the solidifying shell deformation in peritectic steels.

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Section: Introductionmentioning

confidence: 99%

In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell

Yasuda

Narumi

Katsube

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…[9][10][11][12] During continuous casting, peritectic steels in which the solid-shell is unevenly solidified also have relatively large mold level fluctuations, which degrade the surface quality of the cast steel. [13][14][15] One way to minimize the surface defects on cast steel produced by continuous casting is to design chemical compositions that yield an evenly-solidified solid-shell. Furthermore, casting conditions such as mold flux, mold oscillation, and tundish superheat should be chosen carefully by considering the degree of solid-shell unevenness.…”

Section: Introductionmentioning

confidence: 99%

Prediction Model for Degree of Solid-shell Unevenness during Initial Solidification in the Mold

et al. 2021

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“…For instance, using this method, Mizukami and Yamanaka measured the thickness of a longitudinal cross-section of the solidified steel shell along the center of the sample. [9] However, it is not clear that the thickness profile along the center of a slab sample is representative of the nonuniformity of the entire surface area of the shell. There is a strong possibility that key details, such as localized shell thinning or thickness fluctuations, may not be captured along the centerline.…”

Section: Introductionmentioning

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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Generation Mechanism of Unevenness of Ultra Low Carbon Steel at Initial Stage of Solidification

Cited by 17 publications

References 26 publications

In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell

In situ observation of solidification in peritectic steels and evaluation of the strains induced in the solidifying shell

Prediction Model for Degree of Solid-shell Unevenness during Initial Solidification in the Mold

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

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