Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

Beygelzimer, Emmanuil; Beygelzimer, Yan

doi:10.3390/jmmp6040078

Cited by 3 publications

(4 citation statements)

References 59 publications

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“…Therefore, the generation of pores/cavities in the IOL reduced the mechanical properties of the Ni-rich layer. Beygelzimer and Beygelzimer (2022) reported the coefficient of linear thermal expansion (CTE) of FeO and Fe 3 O 4 , and Hausch (2007) reported the CTE of Fe-Ni alloys at different temperatures. Figure 11 gives the CTE of different materials with temperature.…”

Section: Influence Of Ni-fe Particles On the Diffusion Coefficient In...mentioning

confidence: 99%

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Study on the growth mechanism of the internal oxide layer in 9% Ni cryogenic steel

Du,

Sun,

Cai

et al. 2023

Front. Mater.

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The oxidation behavior of the Ni-rich layer in the internal oxide layer (IOL) in 9% Ni cryogenic steel is investigated at 1,150°C for 0–240 min in the air atmosphere. The morphology and phase composition of the Ni—rich layer are analyzed with energy dispersive spectroscopy, scanning electron microscopy, metallographic microscopy, and X—ray diffraction. The results show that the Ni—rich layer mainly consists of gray Fe3O4/FeO and white Ni–Fe particles, with a small amount of black Fe2SiO4. The morphologies of Ni–Fe particles undergo the following changes with isothermal oxidation time: dot—like → strip—like → net-like; at the same time, layered Ni–Fe particles were formed at about 1/3 of the thickness of the Ni—rich layer. Compared with the dot-like Ni–Fe particle, the net-like and layered Ni–Fe particles provide a fast path for the diffusion of O in the Ni—rich layer. However, the experimental steel still has a much lower oxidation rate because of the hindrance of Ni–Fe particles on the out-diffusion of Fe. During the oxidation process, the Kirkendall effect induces pores/cavities in the IOL, which weakens the stability of the IOL. In the end, the spalling phenomenon of the layered Ni–Fe particle occurs at 1,150°C for 180 min.

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Section: Influence Of Ni-fe Particles On the Diffusion Coefficient In...mentioning

confidence: 99%

“…Thermal expansion coefficient (CTE) of different materials with temperature (Hausch, 2007;Beygelzimer and Beygelzimer, 2022).…”

Section: Data Availability Statementmentioning

confidence: 99%

Study on the growth mechanism of the internal oxide layer in 9% Ni cryogenic steel

Du,

Sun,

Cai

et al. 2023

Front. Mater.

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“…Gray correlation analysis can convert multiple evaluation indicators into a single-indicator function, and solve the complex system problem of interrelationships between various factors and indicators by comparing the similarity between the sequences. According to existing research [18], the thickness of the oxide scale on the surface of the strip in actual production also has an impact on the cooling effect. In order to simplify the research, the evolution law of microstructure and residual stress of strip was studied from the perspective of cooling process parameters.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Low-Alloy Hot-Rolled Strip Cooling Process Based on Gray Correlation Analysis

Xue,

Fei

2024

Metals

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The residual stress in low-alloy hot-rolled strips seriously affects the use and processing of products. Reducing residual stress is important for improving the product quality of hot-rolled strips. In this paper, the changes in grain size and residual stress of hot-rolled strips under different cooling processes were investigated via thermal simulation experiments and electron backscatter diffraction. It was found that the optimum cooling process solution for single-objective optimization of grain size was a final rolling temperature of 875 °C, a laminar cooling speed of 50 °C/s, and a coiling temperature of 550 °C. When single-objective optimization of residual stress was carried out, the optimal cooling process scheme was 900 °C for final rolling temperature, 20 °C/s for laminar cooling speed, and 625 °C for coiling temperature. The significance of the effect of cooling processes on grain size and residual stress was analyzed based on the extreme deviation of the effect of each cooling process on grain size and residual stress in orthogonal experiments. The results show that the coiling temperature was the most influential factor on grain size and residual stress among the cooling process parameters. The difference was that grain size increased with increasing coiling temperature, and residual stress decreased with increasing coiling temperature. Using both grain size and residual stress as evaluation indicators, a multi-objective optimization of the cooling process for hot-rolled strips was carried out via the gray correlation analysis method. The optimized solution was 875 °C final rolling temperature, 30 °C/s laminar cooling speed, and 625 °C coiling temperature. At this time, the grain size was 4.8 μm, and the KAM (Kernel Average Misorientation) was 0.40°. The grain size under the actual production process scheme was 4.4 μm with a KAM of 0.78°. Compared to the actual production process solution, the multi-objective optimization solution showed little change in grain size, with only a 9% increase and a 49% reduction in KAM. The optimization scheme in this paper could significantly reduce the level of residual stresses while ensuring the fine grain size of hot-rolled strips, thus improving the overall quality of hot-rolled strips.

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“…𝜃𝜃𝜃𝜃) = 𝑓𝑓𝑓𝑓 10 1+𝑛𝑛𝑛𝑛 (𝜃𝜃𝜃𝜃) = ((1 − 𝜃𝜃𝜃𝜃) 2 ) 1+1,75 = (1 − 𝜃𝜃𝜃𝜃)3,5 ; (61) curve, when G 0 ≥0.01 the following expression was obtained: 𝜏𝜏𝜏𝜏 0 = −15 + 83,73𝐺𝐺𝐺𝐺 0 0,186 .…”

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confidence: 99%

Determination of porosity functions in the pressure treatment of iron-based powder materials in agricultural engineering

Sivak¹,

Kulykivskyi²,

Savchenko³

et al. 2023

Scientific Horizons

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One of the most effective ways to obtain products with the required performance characteristics is the cold plastic deformation of porous workpieces. The relevance of the subject under study is due to the need to increase the reliability of the stress-strain state assessment during the plastic processing of porous workpieces by clarifying the porosity functions. The purpose of the study is to develop a method for describing the mechanical characteristics of porous bodies by single functions, the nature of which is determined by the properties of the base material and does not depend on the initial porosity. Analytical, numerical, experimental, and computational methods using modern specialised software systems were used to examine the processes of plastic deformation. The study presents a method for describing the mechanical characteristics of porous bodies with single functions. A set of interrelated methods and techniques is based on the basic provisions of the mechanics of plastic deformation of porous bodies and allows obtaining reliable porosity functions for this material, by clarifying theoretical dependencies by experimental studies. Therewith, experimental data were obtained in experiments on axisymmetric upsetting of cylindrical samples without friction at the ends. Based on the conducted theoretical studies, porosity functions for iron-based materials are obtained. Samples of five different initial porosities were used for the study. As a result of processing experimental data, final expressions for the porosity functions of the iron-based powder workpiece material are obtained. The study also presents a method for calculating the accumulated deformation of the base material. Flow curves for iron-based powder materials are plotted. The obtained results will allow formulating the practical recommendations for the development of technological processes for the plastic processing of powder materials by pressure to obtain products with specified physical and mechanical properties

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Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

Cited by 3 publications

References 59 publications

Study on the growth mechanism of the internal oxide layer in 9% Ni cryogenic steel

Study on the growth mechanism of the internal oxide layer in 9% Ni cryogenic steel

Multi-Objective Optimization of Low-Alloy Hot-Rolled Strip Cooling Process Based on Gray Correlation Analysis

Determination of porosity functions in the pressure treatment of iron-based powder materials in agricultural engineering

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