Investigation of RE-O-S-As Inclusions in High Carbon Steels

Wang, Hongpo; Li, Xiong; Zhang, Lei; Wang, Yu; Yi-yi, Shu; Zhou, Yuanhua

doi:10.1007/s11663-017-1081-y

Cited by 53 publications

(41 citation statements)

References 18 publications

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“…In the previous work, we investigated inclusions in five heats of steel with the highest La concentration of 0.089 mass%. 19) No arsenic RE inclusions formed in 0.043 mass% La steel but plenty of La 2 O 2 S-LaAsO 4 inclusions formed as La concentration increased to 0.059 mass%. Therefore, it is referred that a value between 0.043 mass% and 0.059 mass% is the critical value for La to act the role on inhibiting the segregation of As.…”

Section: Effect Of Solute Segregation On Formation Of Arsenic Re Inclmentioning

confidence: 96%

“…compounds were also discovered and identified as LaAsO 4 , of which the detail was reported in the previous work. 19) It can be inferred that LaAsO 4 precipitated first on the surface of La 2 O 2 S, because heterogeneous nucleation was more favored over homogeneous nucleation. As the temperature went down, single LaAsO 4 particles also precipitated by homogeneous nucleation.…”

Section: Formation Of Re Inclusionsmentioning

confidence: 99%

“…Figure 2 shows the morphology and EDS images of typical inclusions on the surfaces of 0.059 mass% La and 0.089 mass% La specimens, respectively. It turned out that type A inclusions (points A and C) were La-O-S ternary compounds and considered as La 2 O 2 S, 19) RE 2 O 2 S was also reported the only possible RE oxysulfide in steel. 7) Type B inclusions (points B and D) were La-O binary compounds and considered as La 2 O 3 , since RE 2 O 3 was reported the most possible RE oxide.…”

Section: Formation Of Re Inclusionsmentioning

confidence: 99%

“…The oxides, sulfides and oxysulfides of La are supposed to be the first La-bearing inclusions that form in La-bearing steels, and which forms first depends on the initial chemical compositions. 19) These inclusions are, of cause, the potential heterogeneous nucleation cores of As-bearing inclusions.…”

Section: Effect Of Solute Segregation On Formation Of Arsenic Re Inclmentioning

confidence: 99%

“…It was found that LaAsO 4 existed as both La 2 O 2 S-LaAsO 4 complex inclusions and single LaAsO 4 particles. 19) How and on what conditions will arsenic RE inclusions generate need to be clarified.…”

Section: Introductionmentioning

confidence: 99%

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An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

et al. 2019

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The application of rare earths is an effective way to stabilize residual elements in steel, such as As and P, so as to improve the performances of steel products. In situ methods were used to investigate the formation of inclusions and their stability at high temperatures in arsenic high carbon steels with additions of lanthanum. The results show that La 2 O 3 and La 2 O 2 S started generating in molten steel and had significant difference of appearances and growth behaviors. La 2 O 3 started with triangular particles and rapidly grew up like crystals; by contrast, La 2 O 2 S particles were always spherical or near-spherical and didn't significantly grow up. Arsenic existed as LaAsO 4 that turned out to be unstable under high temperatures. LaAsO 4 decomposed and As dissolved into the matrix when the temperature was higher than 1 200°C. The formation of LaAsO 4 during solidification and the dissolution of As into the matrix during heat treatment can effectively avoid the local enrichment of As. Therefore, it is possible to control As distributed uniformly in steel by appropriate heat treatment process.

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Section: Effect Of Solute Segregation On Formation Of Arsenic Re Inclmentioning

confidence: 96%

Section: Formation Of Re Inclusionsmentioning

confidence: 99%

Section: Formation Of Re Inclusionsmentioning

confidence: 99%

Section: Effect Of Solute Segregation On Formation Of Arsenic Re Inclmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

et al. 2019

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Effect of Microalloyed Elements M (M = Ce, Ti, V, and Nb) on Mechanical Properties and Electronic Structures of γ‐Fe: Insights from a First‐Principles Study

Liu

Yang

Cai

et al. 2021

steel research int.

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Herein, the first-principles calculation is used to study the solid solution behavior of microalloyed elements M (M ¼ Ce, Ti, V, and Nb) in steel, and the effects of M on the mechanical properties and electronic structures of the doped systems are analyzed. The calculated results of the solvation energy and formation enthalpy show that Ce, Ti, V, and Nb can be solubilized in γ-Fe. The elastic modulus calculated results show that M doped reduces the incompressibility and rigidity and of the doped system, but the toughness and machinability are improved. A combination of Bader charge and differential charge density analysis shows that the metallic bond strength of the Fe-M system is weaker than that of the pure Fe system, which is the main reason for the decrease in incompressibility and rigidity of the doped system; the higher electron cloud density of the doped system is the main reason for its toughness increase.

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Effect of Rare‐Earth La on Inclusion Evolution in High‐Al Steel

Zhu

Zhao

et al. 2021

steel research int.

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To investigate the evolution of inclusions in high‐Al steel with addition of La, a series of laboratory experiments and thermodynamic calculations are performed, considering the reaction time and amount of La added. The main inclusions in the high‐Al steel without the addition of La are Al2O3, MnS, and Al2O3–MnS. The La treatment can efficiently modify Al2O3 to La–Al–O or La–O–S inclusions. For La additions less than 0.0041 wt%, the evolution route for the inclusion in high‐Al steel is Al2O3 → LaAl11O18 → LaAlO3 with an increase in reaction time. For high La additions, the evolution route for the Al2O3 inclusion is Al2O3 → LaAl11O18 → LaAlO3 → La2O2S → La2S3. The experimental results correlate with those of the thermodynamic analysis. Notably, excess La in high‐Al molten steel may consume O and S to form La oxysulfide and sulfide, respectively, which prevents the precipitation of MnS inclusion and promotes the formation of AlN inclusion during solidification.

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Investigation of RE-O-S-As Inclusions in High Carbon Steels

Cited by 53 publications

References 18 publications

An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

An <i>in situ</i> Study of the Formation of Rare Earth Inclusions in Arsenic High Carbon Steels

Effect of Microalloyed Elements M (M = Ce, Ti, V, and Nb) on Mechanical Properties and Electronic Structures of γ‐Fe: Insights from a First‐Principles Study

Effect of Rare‐Earth La on Inclusion Evolution in High‐Al Steel

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