Influence of pulsed magneto-oscillation on microstructure and mechanical property of rectangular 65Mn steel ingot

Sun, Jie; Cheng, Sheng; Wang, Dingpu; Zhang, Yunhu; Zhong, Hao; Xu, Zhenming; Li, Lijuan; Zhai, Qijie

doi:10.1007/s42243-018-0111-6

Cited by 12 publications

(7 citation statements)

References 24 publications

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“…Sun's research demonstrated the effectiveness of PMO technology in generating equiaxed grains and refining grains, thereby improving the tensile strength of 65Mn and medium-carbon steel. [4,5] Electromagnetic stirring (EMS) and soft reduction (SR) reduce internal porosity and segregation by improving melt flow and solidification conditions. Wang et al [6] observed a rise in equiaxed grain ratio from 20.4% to 25.7% as the current intensity of mold EMS increased.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Cheng,

Liu,

Liu

et al. 2024

steel research int.

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To investigate the influence of rolling passes on the internal quality during high‐temperature reduction pretreatment (HTRP), three cast ingots with identical total reduction but varying numbers of rolling passes are prepared. The 3D distribution, size, and quantity of defects are analyzed using ultrasonic nondestructive microscopy. The effect of rolling passes on defect healing is studied, with macrostructure, microstructure, and grain size analysis aided by finite element software. In contrast to the three‐pass HTRP, the one‐pass HTRP demonstrates a diminishment of 7% in defect dimensions and a notable decline of 66% in the quantity of defects. The results reveal that increasing the number of rolling passes leads to a deterioration in internal quality of the slab. Reducing the number of rolling passes improves internal strain penetration, facilitates the recrystallization process, and enhances the microstructure uniformity, ultimately improving the internal quality.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Cheng,

Liu,

Liu

et al. 2024

steel research int.

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“…The internal quality of the bearing steel bloom has great influence on its reliability and service life due to the inheritance of the defects from the bloom, such as shrinkage porosity, center segregation, and V-shaped segregation to the subsequent rolling product. Generally, homogenization of the chemical composition by means of electromagnetic stirring (EMS), pulsed magneto-oscillation (PMO), low superheat casting, low secondary cooling intensity, etc., is the most well-known approach to minimize the center segregation [1][2][3][4][5][6]. This approach aims to produce large ratio of equiaxed grains during solidification and normally is an effective way to reduce center segregation.…”

Section: Introductionmentioning

confidence: 99%

Industrial Application of Mechanical Reduction on Continuous Casting of Bearing Steel Bloom

Chen¹,

Deng²,

Niu³

2021

Processes

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Industrial experiments of mechanical soft reduction in continuous casting were conducted in the present study aiming to improve the internal quality of the bearing steel blooms. Two methods were developed to verify the solidification model for a reliable crater end in the caster, which is provided by SMS CONCAST. The verified solidification model was applied to determine the solidification status of the bloom and provides theoretical reduction region. Several trials were conducted to study the optimization of the reduction rate regarding the V-shaped and centerline segregation of the bloom. The results show an obvious improvement of internal quality in the bearing steel bloom by applying appropriate reduction during casting.

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“…Then, Yin et al [21] and Edry et al [22,23] confirmed the refinement effect of PMO in the pure aluminum. Moreover, the application of PMO in the 30Cr2Ni4MoV ingots [24] and rectangular 65Mn steel ingots [25] was carried out to improve solidification structures. Recently, PMO has been employed in continuous casting of steels to improve the macrosegregation of billets in industry.…”

Section: Introductionmentioning

confidence: 99%

Distributions of Electromagnetic Fields and Forced Flow and Their Relevance to the Grain Refinement in Al–Si Alloy Under the Application of Pulsed Magneto-Oscillation

Zhao

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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Distributions of electromagnetic fields and induced forced flow inside a metal melt are crucial to understand the grain refinement of the metal driven by pulsed magneto-oscillation (PMO). In the present study, PMO-induced electromagnetic fields and forced flow in Ga-20wt%In-12wt%Sn liquid metal have been systematically investigated by performing numerical simulations and corresponding experimental measurements. The numerical simulations have been confirmed by magnetic and melt flow measurements. According to the simulated distribution of electromagnetic fields under the application of PMO, the strongest magnetic field, electric eddy current and Lorentz force with inward radial direction inside the melt are concentrated adjacent the sidewall of cylindrical melt at the cross section of middle height of coil. As a result, a global forced flow throughout the whole cylindrical column filled with Ga-20wt%In-12wt%Sn melt is initiated with a flow structure of two pair of symmetric vortex ring. The PMO-induced electromagnetic fields and forced flow in Al-7wt%Si melt have been numerically simulated. The contribution of electromagnetic fields and forced flow to the grain refinement of Al-7wt%Si alloy under the application of PMO is discussed. It indicates that the forced flow may play a key role in the grain size reduction.

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Influence of pulsed magneto-oscillation on microstructure and mechanical property of rectangular 65Mn steel ingot

Cited by 12 publications

References 24 publications

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Industrial Application of Mechanical Reduction on Continuous Casting of Bearing Steel Bloom

Distributions of Electromagnetic Fields and Forced Flow and Their Relevance to the Grain Refinement in Al–Si Alloy Under the Application of Pulsed Magneto-Oscillation

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