Effect of low-frequency AC power supply during electroslag remelting on qualities of alloy steel

Chang, Lei; Shi, Xianbo; Yang, Huibin; Zheng-bang, LI

doi:10.1016/s1006-706x(09)60052-2

Cited by 35 publications

(16 citation statements)

References 2 publications

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“…13) Extensive research studies have been performed to investigate the effect of operating conditions to the steel cleanliness during ESR process. [14][15][16][17] ESR Operating conditions have been gradually modified to control the steel cleanliness to improve the ingot quality in recent years. 14,15) Dong et al 16) studied the effect of slag composition on the inclusions in ESR ingots based on the experiment of interaction between slag and metal and electroslag remelting.…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Wang

2018

ISIJ Int.

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The current paper focuses on the effect of different operating conditions on the content of inclusions and cleanliness of remelting ingots. For these investigations, eight ingots were remelted with two slag amount and with two current intensity under otherwise comparable remelting conditions. A twodimensional (2D) coupled mathematical model was employed to simulate the velocity field, solidification and inclusion motion for a system of electrode, slag and ingot in electroslag remelting (ESR) processes, to reveal the inclusion removal mechanism. The results showed that the content of large-sized inclusions in ESR ingot was decreased by approximately 66.18% when the slag amount was increased from 17.85 kg to 20.50 kg. Because of the increase of slag amount, the metal and slag flow faster and the maximal velocity increases by 10.3%, thus there is an increasing trend in trajectories of inclusions (i.e., inclusion motion) in slag pool resulted from the stronger natural convective flow, which is beneficial for the inclusion removal. When the average current was increased from 4 kA to 5 kA, the content of large-sized inclusions in ESR ingot was decreased by approximately 51.38%. Because of the increasing of current, the flow in the middle of the slag pool becomes stronger and the maximal downward velocity increases by 2.7%, thus there is an increasing trend in the renewal rate of the metal film surface due to the stronger washing by slag flow, which can promote the inclusion removal.

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Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Wang

2018

ISIJ Int.

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“…Meanwhile, a low frequency remelting current can increase the power factor, meaning that a large electric energy can be saved, especially for the large scale ESR process. 20,21) Some researches [22][23][24] had been done about the influences of the low frequency current on the ESR process, but few reports were released in regard to the droplet evolution behaviors under the MC-ERS process.…”

Section: Influences Of the Transverse Static Magnetic Field On The Drmentioning

confidence: 99%

Influences of the Transverse Static Magnetic Field on the Droplet Evolution Behaviors during the Low Frequency Electroslag Remelting Process

Huai

Zhong

et al. 2017

ISIJ Int.

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“…The grain growth direction is generally defined by the grain growth angle, which is the angle between the primary dendrites of the grain and the axis of the ingot [4]. Practice has shown that ESR ingots with a small grain growth angle can exhibit improved hot forging performance [5]. Enormous mathematical models and experiments [4][5][6][7] have confirmed that the local temperature gradients and solidification conditions have a vital effect on the structure of ESR ingots.…”

Section: Introductionmentioning

confidence: 99%

“…Practice has shown that ESR ingots with a small grain growth angle can exhibit improved hot forging performance [5]. Enormous mathematical models and experiments [4][5][6][7] have confirmed that the local temperature gradients and solidification conditions have a vital effect on the structure of ESR ingots. However, the subtle differences of the structural evolution in different zones of ESR dual alloy ingot have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting

Liu

Zhang

et al. 2016

Metals

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Abstract:The structural evolution and segregation in a dual alloy made by electroslag remelting (ESR) was investigated by various analytical techniques. The results show that the macrostructure of the ingot consists of two crystallization structures: one is a quite narrow, fine, equiaxed grain region at the edge and the other is a columnar grain region, which plays a leading role. The typical columnar structure shows no discontinuity between the CrMoV, NiCrMoV, and transition zones. The average secondary arm-spacing is coarsened from 35.3 to 49.2 µm and 61.5 µm from the bottom to the top of the ingot. The distinctive features of the structure are attributed to the different cooling conditions during the ESR process. The Ni, Cr, and C contents markedly increase in the transition zone (TZ) and show a slight increase from the bottom to the top and from the surface to the center of the ESR ingot due to the partition ratios, gravity segregation, the thermal buoyancy flow, the solutal buoyancy flow, and the inward Lorentz force. Less dendrite segregation exists in the CrMoV zone and the transition zone due to a stronger cooling rate (11.1 and 4.5 • C/s) and lower Cr and C contents. The precipitation of carbides was observed in the ingot due to a lower solid solubility of the carbon element in the α phase.

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Effect of low-frequency AC power supply during electroslag remelting on qualities of alloy steel

Cited by 35 publications

References 2 publications

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Influences of the Transverse Static Magnetic Field on the Droplet Evolution Behaviors during the Low Frequency Electroslag Remelting Process

The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting

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