Computation of Phase Fractions in Austenite Transformation with the Dilation Curve for Various Cooling Regimens in Continuous Casting

Dong, Zhihua; Chen, Dengfu; Long, Mujun; Li, Wei; Chen, Huabiao; Vitos, Levente

doi:10.1007/s11663-015-0545-1

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…Cooling of the sample shows a decrease in the specimen dimension until it reaches 1183 K. After that, there is an increase in dilation up to 1143 K, which is followed by a decrease in dilation again due to contraction of the specimen up to room Currently, the average cooling rate in the secondary cooling zone is less than 30 K/min during the continuous casting [28,29]. Meanwhile, it can be found that the austenite decomposition temperatures (Ar 3 and Ar 1 ) are inversely proportional to the cooling rate, but the linear thermal expansion coefficient of the single-phase region at different cooling rates does not seem to be significantly different according to the published literatures [30,31]. Therefore, dilatometry experiments are performed with a cooling rate of 5 K/min in this work to obtain an austenite decomposition temperature as accurate as possible (close to the equilibrium).…”

Section: Thermal Expansion and Phase Transition Behavior Of If Steelmentioning

confidence: 99%

Ab Initio Calculations on Elastic Properties of IF Steel Matrix Phase at High Temperature Based on Lattice Expansion Theory

Long

Zhang

et al. 2020

Metals

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Elucidating the evolution law of the elastic properties of the matrix phase is of great significance for the control of steel properties and quality during continuous casting and subsequent heat treatment. In this paper, thermal expansion experiments and ab initio calculations are used to study the elastic properties of the interstitial free (IF) steel matrix phase in different magnetic states and crystal structures. The results show that the bulk modulus B and the tetragonal shear elastic constant C’ for the entire temperature range decrease with increasing temperature, but C44 is the opposite. While from paramagnetic (PM) to ferromagnetic (FM) state, C’(C44) have changed ~188% (~27%), B increases by ~55% during the crystal structure change (fcc→bcc). With the FM to PM state, the Zener anisotropy parameter increases sharply, and Young’s modulus decreases significantly in the [001] direction; the maximum difference is ~76 GPa. The evolution rate of average Young’s modulus in single bcc-phase FM (fcc-phase PM) range reaches ~5.5(~5.6) × 10−2 GPa K−1. The research provides an effective method for ab initio calculation of the elastic properties of interstitial free and ultra-low carbon steels at high temperature, also furnishing a basis for the application of ab initio calculations to the high temperature performance of steel materials.

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Section: Thermal Expansion and Phase Transition Behavior Of If Steelmentioning

confidence: 99%

Ab Initio Calculations on Elastic Properties of IF Steel Matrix Phase at High Temperature Based on Lattice Expansion Theory

Long

Zhang

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

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Ab Initio Study on Continuous Evolution of Mechanical Properties in Phase‐Transition Region of Low‐Carbon Steel

Long

Guo

et al. 2020

steel research int.

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To control steel quality during continuous casting and subsequent heat treatment, an understanding of the evolution laws of mechanical properties during the austenite transition and the underlying mechanisms is of importance. Herein, the peak separation method is used to investigate the expansion behaviors in low‐carbon steel. And the elastic properties of the matrix phase are calculated using the exact muffin‐tin orbitals (EMTO) method. A continuous evolution model of high‐temperature properties in the phase‐transition region is established for ab initio data and experimental results. The evolution laws of the tetragonal shear elastic constant C′ and Young's modulus E agree well with that of the high‐temperature strength. The critical temperature for ductility to brittleness is 850 °C. The matrix phase exhibits significantly brittleness character and increases slightly with decreasing temperature in single‐phase paramagnetic (PM) γ‐Fe region. The straightening zone temperature should be controlled above 950 °C to avoid cracks. In the austenite transition region, the drop rate of the magnetic moment reaches 18.90%. The findings suggest that the evolution law of mechanical properties of steels can be predicted from the elastic properties, especially during the austenite transition process, providing a basis for the prediction of material properties using ab initio methods.

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Prediction model for crack sensitive temperature region and phase fractions of slab under continuous casting cooling rates based on finite number of experiments

Long

Xin-hua

et al. 2023

Journal of Materials Research and Technology

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Computation of Phase Fractions in Austenite Transformation with the Dilation Curve for Various Cooling Regimens in Continuous Casting

Cited by 4 publications

References 37 publications

Ab Initio Calculations on Elastic Properties of IF Steel Matrix Phase at High Temperature Based on Lattice Expansion Theory

Ab Initio Calculations on Elastic Properties of IF Steel Matrix Phase at High Temperature Based on Lattice Expansion Theory

Ab Initio Study on Continuous Evolution of Mechanical Properties in Phase‐Transition Region of Low‐Carbon Steel

Prediction model for crack sensitive temperature region and phase fractions of slab under continuous casting cooling rates based on finite number of experiments

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