Effect of Silicon, Manganese and Heating Rate on the Ferrite Recrystallization Kinetics

Shah, Vitesh; Krugla, Monika; Offerman, S.E.; Sietsma, Jilt; Hanlon, D. N.

doi:10.2355/isijinternational.isijint-2019-475

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…It is a typical pearlite structure obtained through the recrystallization process, as shown in our previous study on the same alloys in Ref. [62]. The ferrite grain size within pearlite colonies is found to be between 0.5 and 1.0 µm in diameter (Figure 6a).…”

Section: Alloysupporting

confidence: 77%

Microsegregation Influence on Austenite Formation from Ferrite and Cementite in Fe–C–Mn–Si and Fe–C–Si Steels

Krugla,

Offerman,

Sietsma

et al. 2024

Metals

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The production reality of sheet steels from casting to the end product is such that in the cases of ultra- and advanced high-strength steels, we have to deal with the segregation of elements on macro- and microlevels. Both can have a significant impact on the microstructure formation and resulting properties. There are several production stages where it can influence the transformations, i.e., casting, hot rolling process and annealing after cold rolling. In the present work, we focus on the latter, and more specifically, the transformation from ferrite–cementite to austenite, especially the nucleation process, in cold-rolled material. We vary the levels of two substitutional elements, Mn and Si, and then look in detail at the microsegregation and nucleation processes. The classical nucleation theory is used, and both the chemical driving force and strain energy are calculated for various scenarios. In the case of a high Mn and high Si concentration, the nucleation can thus be explained. In the cases of high Mn and low Si concentrations as well as low Mn alloys, more research is needed on the nuclei shapes and strain energy.

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Section: Alloysupporting

confidence: 77%

Microsegregation Influence on Austenite Formation from Ferrite and Cementite in Fe–C–Mn–Si and Fe–C–Si Steels

Krugla,

Offerman,

Sietsma

et al. 2024

Metals

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“…The latter samples exhibited more uniform and smaller grain sizes. A higher heating rate provides a greater driving force for recrystallization due to enhanced nucleation under elevated driving forces [21][22][23][24]. addition, uniformity in heating also affects the recrystallization microstructure [25,26].…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Heating and Cooling Rates during Solution Treatment on Microstructure and Properties of AA7050 Alloy Wires

Gao,

et al. 2024

Materials

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In the present study, the effects of varying heating and cooling rates during the solution treatment process on the microstructure and properties of AA7050 alloy wires were investigated using tensile tests, metallographic microscopy, electron backscattered diffraction, and transmission electron microscopy. It was found that the recrystallized grain size of the alloy, subjected to method of rapid heating, exhibited a smaller and more uniform distribution in comparison to method of slow heating. The low density of η′ strengthening phases after the artificial aging treatment was formed using air cooling method. Meanwhile, by using the water quenching method sufficient solute atoms and more nucleation sites were provided resulting in a large number of η′ strengthening phases being formed. In addition, the alloy processed using the water quenching method displayed higher strength than that treated using the air cooling method for the T6 and T73 states. Furthermore, coarse precipitates formed and less clusters were observed in the matrix, while high density nanoscale clusters and no continuous precipitation are formed when using the water quenching method.

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“…Як відомо, для підвищення механічних властивостей криці використовують леґування Манґаном і Силіцієм. Дослідження комбінованих ефектів Si і Mn може бути ще більш актуальним через спільну сеґреґацію їх не тільки в перліті, але також на межах зерен фериту [5]. Взаємодія між атомами Si і Mn приводить до додаткового підвищення температури початку рекристалізації, тобто до ефекту гальмування цього процесу [5].…”

Section: вступunclassified

“…Дослідження комбінованих ефектів Si і Mn може бути ще більш актуальним через спільну сеґреґацію їх не тільки в перліті, але також на межах зерен фериту [5]. Взаємодія між атомами Si і Mn приводить до додаткового підвищення температури початку рекристалізації, тобто до ефекту гальмування цього процесу [5]. Відомо, що Манґан стабілізує аустеніт [6], зменшує дифузійну рухливість Карбону в аустеніті та схильний до макросеґреґації [7].…”

Section: вступunclassified

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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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Effect of Silicon, Manganese and Heating Rate on the Ferrite Recrystallization Kinetics

Cited by 9 publications

References 43 publications

Microsegregation Influence on Austenite Formation from Ferrite and Cementite in Fe–C–Mn–Si and Fe–C–Si Steels

Microsegregation Influence on Austenite Formation from Ferrite and Cementite in Fe–C–Mn–Si and Fe–C–Si Steels

Effects of Different Heating and Cooling Rates during Solution Treatment on Microstructure and Properties of AA7050 Alloy Wires

Influence of the Carbon, Manganese, and Silicon Content on Formation of Structural Components During Continuous Casting of Steels

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