Elimination Mechanism of Shrinkage Porosity During Pressurized Solidification Process of 19Cr14Mn4Mo1N High-Nitrogen Steel Ingot

Li, Huabing; Ni, Zhuo-Wen; Zhu, Hong‐Chun; He, Zhiyu; Feng, Hao; Zhang, Shucai; Wang, Yu

doi:10.1007/s11663-023-02770-z

Cited by 12 publications

(2 citation statements)

References 43 publications

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“…14) Xu found the magnitude of surface tension has a strong influence on the rising of bubbles in the liquid phase. 15) For high nitrogen steel, pressurized metallurgy is recognized as one of the most effective methods for manufacture, including pressurized induction melting, pressurized electroslag remelting (PESR), et al [16][17][18][19] Pressure is a critical metallurgical parameter that has been shown to considerably enhance nitrogen solubility and impede the formation of nitrogen pores. 1,[20][21][22] Despite the extensive research on the formation process of nitrogen bubbles in high nitrogen steel ingots, the impact of solidification pressure on the rising and breakup of nitrogen bubbles in high nitrogen molten steel is still not well comprehended.…”

Section: Introductionmentioning

confidence: 99%

Function of Solidification Pressure on the Rising and Breakup of Nitrogen Bubbles in Molten Steel

Zhu,

Ni,

et al. 2024

ISIJ Int.

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In this study, the rising and breakup of nitrogen bubbles in high nitrogen molten steel considering different solidification pressure has been numerically simulated by the VOF model verified comparing velocity and deformation of bubbles in water. Rising process of nitrogen bubble in the molten steel is divided into three stages. In stage I, nitrogen bubble experiences an inward depression and splits into a main bubble and two daughter bubbles. In stage II, the main bubble deforms slightly, and a few discrete bubbles split from both sides of the main bubble. In stage III, the main bubble rises to the surface of molten steel, and a large number of discrete bubbles split from the main bubble. As the solidification pressure increases from 0.1 to 2 MPa, the area of main and daughter bubbles decreases. Moreover, the jet becomes stronger with the solidification pressure, which makes the daughter bubbles more prone to splitting out. The total rising time and the maximum rising velocity of the main nitrogen bubble decrease with increasing solidification pressure. This decrement weakens the disturbance of the bubbles rising on the high nitrogen molten steel in stage III, leading to a decrease in the number of discrete bubbles.

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Section: Introductionmentioning

confidence: 99%

Function of Solidification Pressure on the Rising and Breakup of Nitrogen Bubbles in Molten Steel

Zhu,

Ni,

et al. 2024

ISIJ Int.

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“…Precise prediction of the location and magnitude of shrinkage and porosity in steel ingots can be achieved through numerical simulation of the solidification process by integrating the continuity, momentum, and energy equations. [ 26,27 ] Nevertheless, simulation calculations are time‐intensive and necessitate considerable memory resources. Empirical evidence suggests that disregarding flow phenomena and executing numerical simulations with a focus on heat transfer can still produce viable outcomes in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Porosity Model for Steel Ingots with Reduction Deformation during Solidification

Zhang,

Nian,

Zhang

et al. 2024

steel research int.

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This article studies the shrinkage porosity model for steel ingots with reduction deformation during solidification, and examines the effect of reduction deformation on the shrinkage porosity. Initial investigations involve conducting experiments on reduction deformation during steel ingot solidification, entailing laboratory‐based high‐temperature melting and jack reduction process, with a focus on diverse reduction amounts and cooling times before reduction. Post‐experimental procedures include sample sectioning, acid etching, and low‐magnification structural analysis. Following this, numerical simulations are employed to model the solidification and reduction deformation processes of the steel ingot. Ultimately, a shrinkage porosity criterion model is developed, integrating the equivalent plastic strain resulting from reduction deformation during solidification into the micro‐porosity criterion model. This approach facilitates the prediction of micro‐porosity distribution following reduction deformation. Findings reveal that the shrinkage porosity criterion G2L−5/3ε/εa, which includes the equivalent plastic strain coefficient, effectively predicts the distribution of micro‐porosity subsequent to reduction deformation during steel ingot solidification. A higher reduction amount during the solidification process corresponds to a lowered level of internal micro‐porosity.

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Revealing the Removal Mechanism of Vanadium Addition on Nitrogen Pores in 30Cr15Mo1N High‐Nitrogen Steel Ingot

Zhu,

Ni,

et al. 2023

steel research int.

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The removal mechanism of vanadium addition on nitrogen pores in 30Cr15Mo1N ingot is systematically investigated through statistical analysis and theoretical calculation. The nitrogen solubility is obtained by the thermodynamic model, and the nitrogen content is obtained by combining the ProCAST software and the C–K model. Then, according to the formula of critical nucleation radius and growth rate of nitrogen bubbles, the variation of critical nucleation radius and growth rate of nitrogen bubbles with different vanadium contents is calculated. As the vanadium content increases, the number and mean area of nitrogen pores decrease. In comparison to the 0 V ingot, the number of nitrogen pores decreases in the 0.2 V ingot, but there is an increase in the number of large‐sized nitrogen pores (>3000 μm in diameter). When the vanadium content increases to 0.4, the nitrogen pores are completely removed. The results demonstrate that increasing vanadium content can remove nitrogen pores. Since the solidification mode remains unchanged with increasing vanadium content, increasing the vanadium content cannot remove nitrogen pores by changing the solidification mode of the 30Cr15Mo1N ingots. Therefore, increasing the vanadium content removes the nitrogen pores mainly by inhibiting the nucleation of nitrogen bubbles and promoting nitrogen bubble overflow in 30Cr15Mo1N ingots.

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Elimination Mechanism of Shrinkage Porosity During Pressurized Solidification Process of 19Cr14Mn4Mo1N High-Nitrogen Steel Ingot

Cited by 12 publications

References 43 publications

Function of Solidification Pressure on the Rising and Breakup of Nitrogen Bubbles in Molten Steel

Function of Solidification Pressure on the Rising and Breakup of Nitrogen Bubbles in Molten Steel

Shrinkage Porosity Model for Steel Ingots with Reduction Deformation during Solidification

Revealing the Removal Mechanism of Vanadium Addition on Nitrogen Pores in 30Cr15Mo1N High‐Nitrogen Steel Ingot

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