Influence of Niobium Microalloying on the Kinetics of Static and Dynamic Recrystallization during Hot Rolling of Medium-Carbon High-Strength Steels

Knyazyuk, T. V.; Novoskoltsev, N. S.; Zisman, A. A.; Хлусова, Е. И.

doi:10.1134/s207511332006009x

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…Namely, at 1100 °C the 35% thickness reduction of martensitic steel can trigger DR, but the latter cannot notably develop. [24] As to the bainitic steel, relatively low strains at sequential passes of the industrial hot rolling did not enable significant DR since accumulation of austenite strain hardening is limited by softening processes during inter-pass pauses. [33] Note also that the character of texture developed during austenite deformation and subsequent recrystallization does not depend significantly on the composition of low to medium carbon steels.…”

Section: Discussionmentioning

confidence: 97%

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Texture Analysis of Hot Rolled Martensitic and Bainitic Steels by Electron Backscatter Diffraction to Quantify Parent Austenite States

Zisman,

Zolotorevsky,

Petrov

2024

steel research int.

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To measure textures of hot rolled martensitic and bainitic steels, electron backscatter diffraction (EBSD) is applied to large areas, each covering about a thousand of prior grains. A scanning step is selected to keep reasonable time of the data acquisition still providing in any grain a significant number of analyzed points. Contributions to the transformation texture appearing from deformation and recrystallization components of the parent texture are estimated with the Bain relationship. To assess the parent austenite state, their proportion is then expressed by a scalar parameter. The results are verified by independent metallographic data. Avoiding the reconstruction of prior grains, this statistical approach will facilitate evaluation of complex austenite structures with comparable fractions of dissimilar material states.

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Section: Discussionmentioning

confidence: 97%

“…In both cases the final plates had martensitic microstructures. According to our earlier experiments, [ 24 ] at the lower or the higher rolling temperature, respectively, the parent phase of this steel stays deformed or undergoes recrystallization.…”

Section: Methodsmentioning

confidence: 93%

Texture Analysis of Hot Rolled Martensitic and Bainitic Steels by Electron Backscatter Diffraction to Quantify Parent Austenite States

Zisman,

Zolotorevsky,

Petrov

2024

steel research int.

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show abstract

“…The rolling action had stored some deformation energy, some of which would be consumed by the austenite recrystallization process. When the crystals undergo the pearlite transition, the leftover deformation energy causes the production of dislocations and point defects [ 35 ]. The dislocations gradually intersect to generate dislocation walls and subgrain boundaries as more dislocations build up in the crystal.…”

Section: Discussionmentioning

confidence: 99%

Application Research on Nb Microalloying of High-Carbon Pearlite Bridge Cable Wire Rods

Zhu

Zhou

et al. 2023

Materials

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The application of Nb microalloying to high-carbon pearlite bridge cable wire rod steel has always been controversial, especially in the actual production process, which will be affected by the cooling rate, holding temperature and final bonding temperature. In this paper, the experimental characterization, finite element simulation and phase diagram calculation of the test steel were carried out, then the microstructure and properties of different parts of Nb microalloying of bridge cable wire rods were compared and analyzed. The phase transition interval of pearlite during the water-cooling process of bridge cable wire rods is increased due to the refinement of austenite grains, and the significant increase in the end temperature of the phase transition makes the average interlamellar spacing of pearlite increase. The cooling rate of different parts of bridge cable wire rods simulated by Abaqus has little difference. At the same time, Nb microalloying effectively increases the proportion of low-angle grain boundaries, so that the overall average misorientation representing the surface defects is reduced. This helps to reduce the surface energy and increase the stability of the microstructure. Combined with the mechanical properties of microtensile rods, it is found that the grain refinement effect of Nb is greater than that of coarsening interlamellar spacing during hot rolling deformation in actual production, which makes the tensile strength at the 1/4 section increase significantly. The overall tensile strength and area shrinkage of the steel wire have also been effectively improved.

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“…Specifically, the addition of Nb (niobium) as a microalloying element has been proven to significantly enhance the mechanical properties of steel. Precise control of Nb not only plays a crucial role in the solid solution strengthening and grain refinement effects of the alloy but also restricts the grain growth through grain boundary pinning mechanisms, thereby maintaining a fine-grained Materials 2024, 17, 1259 2 of 11 structure in the steel during high-temperature rolling processes [5][6][7][8][9]. Furthermore, grain refinement can improve the uniformity of the material during deformation, reducing the risk of performance degradation caused by temperature changes and stress concentration.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Niobium-Microalloying Ultra-High-Strength Bridge Cable Steel during Hot Rolling

Zhou,

Yu,

Chen

et al. 2024

Materials

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This study focuses on exploring the effects of niobium (Nb)-microalloying on the properties of steel for ultra-high-strength bridge cables during hot-rolling processes. We employed a combination of dual-pass compression tests, stress–strain curve analysis, and Electron Backscatter Diffraction (EBSD) techniques to investigate the influence of Nb-microalloying on the static recrystallization behavior and grain size of the steel. The key findings reveal that Nb-microalloying effectively inhibits static recrystallization, particularly at higher temperatures, significantly reducing the volume fraction of recrystallized grains, resulting in a finer grain size and enhanced deformation resistance. Secondly, at a deformation temperature of 975 °C, Nb-containing steel exhibited finer grain sizes compared to Nb-free steel when held for 10 to 50 s; however, the grain size growth accelerated when the hold time exceeded 50 s, likely linked to the increased deformation resistance induced by Nb. Lastly, this research proposes optimal hot-rolling process parameters for new bridge cable steel, recommending specific finishing rolling temperatures and inter-pass times for both Nb-containing and Nb-free steels during the roughing and finishing stages. This study suggests optimal hot-rolling parameters for both Nb-containing and Nb-free steels, providing essential insights for improving hot-rolling and microalloying processes in high-carbon steels for bridge cables.

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Influence of Niobium Microalloying on the Kinetics of Static and Dynamic Recrystallization during Hot Rolling of Medium-Carbon High-Strength Steels

Cited by 5 publications

References 14 publications

Texture Analysis of Hot Rolled Martensitic and Bainitic Steels by Electron Backscatter Diffraction to Quantify Parent Austenite States

Texture Analysis of Hot Rolled Martensitic and Bainitic Steels by Electron Backscatter Diffraction to Quantify Parent Austenite States

Application Research on Nb Microalloying of High-Carbon Pearlite Bridge Cable Wire Rods

The Performance of Niobium-Microalloying Ultra-High-Strength Bridge Cable Steel during Hot Rolling

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