Effect of Magnesium Treatment on the Hot Ductility of Ti-Bearing Peritectic Steel

Qu, Tianpeng; Wang, Deyong; Wang, Huihua; Hou, Dong; Tian, Jiemo

doi:10.3390/met10101282

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…Як відомо, під час безперервного лиття, а особливо, високошвидкісного лиття, можливе утворення поверхневих поздовжніх тріщин у низьковуглецевих крицях [1,2]. Появу тріщин пов'язують з перитектичною реакцією в результаті фазових перетворень: розтоп (L) → ферит (δ) → аустеніт (γ).…”

Section: вступunclassified

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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Section: вступunclassified

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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“…Shi et al [ 20 ] pointed out that the strength of ferrite film will be reduced by MnS with large size, and Mg treatment will form the dispersed MgO particles in steel which can be used as the nucleation core for the precipitation of MnS, to disperse MnS particles in steel and improve the high‐temperature ductility of slab. Wang et al [ 21 ] studied the Mg treatment of titanium‐bearing peritectic steel in combination with the laboratorial and industrial tests. A large number of complex inclusions with MgO or MgO·Al 2 O 3 as the core precipitated by TiN are generated in the steel, which can significantly promote the reduction in the size of individual TiN precipitates and the dispersed distribution in the steel.…”

Section: Introductionmentioning

confidence: 99%

“…Although Mg treatment can be used to significantly improve the transverse corner crack of continuous casting slab of peritectic steel, [ 20,21,28 ] there are few reports on clarification of its mechanism. Only a few reports focused on the effect of nano‐TiN particles generated in continuous casting process on the microstructure and high‐temperature ductility of peritectic steel slab.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few reports focused on the effect of nano‐TiN particles generated in continuous casting process on the microstructure and high‐temperature ductility of peritectic steel slab. [ 21,28 ] The mechanism of Mg treatment on inclusions in the steelmaking process of peritectic steel is not clear. In view of the application of Mg treatment in peritectic steel, as the incidence of transverse corner crack can be greatly reduced by modifying the inclusions in the steel, it is necessary to clarify the effect of Mg treatment on inclusions in Ti‐bearing peritectic steel.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and Evolution of Inclusions in Ti‐Bearing Peritectic Steel with Mg Treatment

Cai

Deng

Yang

et al. 2021

steel research int.

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Mg treatment is conducted in the production of peritectic steel, which greatly reduces the average value of incidence of transverse corner crack in continuous casting slab from 3.10% to 1.06% by 65.8%. In the industrial experiment with the stages of Ar station, before magnesium treatment, after magnesium treatment, and in the slab, the maximum Mg content is 30 ppm after Mg treatment. A large number of Mg containing complex inclusions are formed, and most of Al2O3 are transformed into MgO·Al2O3. In the inclusions, the content of MgO significantly increases from 3.58% to 27.2%. The number density of Mg containing inclusions increases from 45.2 to 168 mm−2. The oxide inclusions smaller than 2 μm account for more than 90%, indicating that Mg treatment can promote the refinement of inclusions. In the slab, most oxide inclusions are transformed into the complex inclusions with Mg containing oxides as the core covered by TiN and sulfide precipitates. These complex inclusions with a size above 1 μm can effectively promote the nucleation and growth of intragranular ferrite to prevent the generation of transverse corner cracks.

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Influence of Zr and Ti on MnS Inclusions, Microstructure, and Mechanical Properties of F38MnVS6 Steel

Qiu,

Zhang,

et al. 2024

steel research int.

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The influence of Zr and Ti on the inclusions, microstructure, and mechanical properties of three sets of steel prepared using a vacuum induction melting furnace is analyzed. In steel without Zr and Ti, MnS is mainly distributed in the grain boundary with a rod‐like or dendritic morphology, an average diameter of 10 μm, and a quantity of 2.08 × 104 m−3. After alloying with Zr and Ti, MnS in steel is evenly distributed and adopted a blocky or spherical morphology with an average diameter of 7.2 μm and a quantity of 11.01 × 104 m−3. The oxygen content in steel do not have a remarkable impact on the MnS morphology. ZrO2 and Ti2ZrO6 formed in steel display a slight lattice disregistry with MnS. During solidification, MnS precipitates easily as types I and III MnS, with oxides serving as the core. The MnS composite exhibits remarkable deformation resistance during forging. The addition of Zr and Ti increases the proportion of intragranular ferrite in steel and decreases the pearlite lamellae spacing and average grain size, increasing the yield strength from 745 to 820 MPa and the impact energy from 21 to 56 J at room temperature. Overall, the addition of Zr and Ti considerably improves the mechanical properties of steel.

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Effect of Magnesium Treatment on the Hot Ductility of Ti-Bearing Peritectic Steel

Cited by 8 publications

References 23 publications

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

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

Characteristics and Evolution of Inclusions in Ti‐Bearing Peritectic Steel with Mg Treatment

Influence of Zr and Ti on MnS Inclusions, Microstructure, and Mechanical Properties of F38MnVS6 Steel

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