Effect of Cerium Element on Non-metallic Inclusions Formation During Molten and Solidification Processes of Q355 Microalloy Structural Steel

Zhao, Bo; Wu, Wei; Yang, Feng; Zeng, Jiaqing; Liang, Zhigang; He, Jianzhong

doi:10.1007/s11663-024-03005-5

Metall Mater Trans B

2024

DOI: 10.1007/s11663-024-03005-5

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Effect of Cerium Element on Non-metallic Inclusions Formation During Molten and Solidification Processes of Q355 Microalloy Structural Steel

Bo Zhao,

Wei Wu,

Feng Yang

et al.

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2024

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Cited by 2 publications

References 33 publications

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Effect of Gadolinium on Inclusions and Microstructure of an Al-Killed High Sulfur Steel Used for the Connecting Rod of Engines

Wei,

Ren,

Gao

et al. 2024

Metall Mater Trans B

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Effect of Gadolinium on Inclusions and Microstructure of an Al-Killed High Sulfur Steel Used for the Connecting Rod of Engines

Wei,

Ren,

Gao

et al. 2024

Metall Mater Trans B

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Time-Dependent Study of Inclusions in Bearing Steel Subjected to Rare Earth Treatment with Secondary Oxidation

Wang,

Xia,

Zhou

et al. 2024

Crystals

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Due to the strong reducibility and chemical activity of rare earths, the diffusion behavior and secondary oxidation of rare earths in the steel liquid will also have a significant impact on the modified products when rare earths are added to bearing steel, resulting in poor control of distribution behavior. Therefore, this paper studies the influence of time factors on the evolution of rare earth inclusions. The inclusion evolution behavior at different times when the bearing steel was treated with rare earths and subjected to secondary oxidation was simulated at 1873 K (1600 °C). At a cerium content of 0.012% in steel and a secondary oxidation of 0.0025%, the cerium content in steel and the total oxygen (T.O.) content in steel were determined at the 30 s, 3 min, 5 min, and 7 min after the addition and the inclusions were characterized by automatic scanning electron microscopy. The results demonstrated the formation of a cerium-enriched zone after the addition of the cerium alloy to the steel. As time progressed, a considerable number of inclusions were generated in the cerium-enriched zone, which subsequently disappeared. The trend in the composition of the inclusions can be described as Al2O3 → Ce2O2S + CeS → Ce2O2S. The final composition of the inclusions matches the thermodynamic phase diagram. Following the addition of the transient oxidant Fe2O3 to the molten steel, an oxygen-enriched zone was formed. As time progressed, a considerable number of inclusions were generated in the oxygen-enriched zone and subsequently disappeared. The trend of inclusions composition was as follows: Ce2O3 + CeAlO3 + Al2O3 → Ce2O3 + CeAlO3 → Ce2O2S + CeAlO3. The final inclusion composition coincides with the thermodynamic phase diagram.

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Effect of Cerium Element on Non-metallic Inclusions Formation During Molten and Solidification Processes of Q355 Microalloy Structural Steel

Cited by 2 publications

References 33 publications

Effect of Gadolinium on Inclusions and Microstructure of an Al-Killed High Sulfur Steel Used for the Connecting Rod of Engines

Effect of Gadolinium on Inclusions and Microstructure of an Al-Killed High Sulfur Steel Used for the Connecting Rod of Engines

Time-Dependent Study of Inclusions in Bearing Steel Subjected to Rare Earth Treatment with Secondary Oxidation

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