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Effect of magnetic field on elements segregation in electroslag ingot

Journal of Iron and Steel Research International 2022年第3期29卷 434-444页

作者： Gang Gao Chun-li Zhu Xiao-fang Shi Li-zhong Chang School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina SINO STEEL Ma’anshan Institute of Mining Research Co. Ltd.Ma’anshan243000AnhuiChina

In order to improve the production efficiency of electroslag remelting process and the solidification quality of electroslag ingot,a novel electroslag furnace with electromagnetic stirring was designed and the effects of external magnetic field and different electrical parameters on electroslag remelting process were *** distribution of carbon,chromium,phosphorus and compactness in electroslag ingot was analyzed through original position analysis *** show that the external magnetic field accelerates the remelting of consumable *** the condition of remelting voltage of 34 V and current of 1500 A,the remelting rate of metal consumable electrode increases from 20 to 27 mm min−1 when the magnetic induction intensity of 62×10^(−4) and 108×10^(−4) T is ***,the remelting current decreases from 1500 to 1100 A under the condition of constant remelting rate and remelting voltage,thereby reducing the energy *** effect of external magnetic field on the segregation of different elements in electroslag ingot is *** the experimental conditions,the carbon segregation is unremarkable,but the phosphorus segregation is improved when the electromagnetic force generated by the interaction between the external magnetic field and the remelting current is ***,the excessive electromagnetic force aggravates the segregation of carbon and *** the increase in electromagnetic force,the chromium segregation gradually increases.

关键词： Electroslag remelting Magnetic field Solidification Segregation remelting rate

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Macro-and Microstructure Evolution of 5CrNiMo Steel Ingots during Electroslag remelting Process

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Journal of Iron and Steel Research International 2014年第7期21卷 644-652页

作者： Lei RAO Jian-hua ZHAO Zhan-xi ZHAO Gang DING Mao-peng GENG College of Mechanical and Electronic Engineering Hohai University Xinya Special Steel Forging Co. Ltd. College of Mechanical and Electronic Engineering Nanchang University

A comprehensive mathematical model was established and used to simulate the macro and microstructure evolution during the production process of 5CrNiMo steel ingot by electroslag remelting （ESR） method. Along the ingot height, the macrostructure distribution characteristics changed from vertical, fine columnar grains to tilted, coarse columnar grains, and this transformation process occurred at the very beginning of ESR. In the cross section of the ingot, there were three grain morphology regions and two grain type transition regions from the outside to the center of the ingot. These regions were the fine columnar grain region, columnar competitive growth transition re gion, coarse columnar grain region, columnar to equiaxed grain transition （CET） region, and coarse equiaxed grain region. The influence of the remelting rate on the macrostructure and mlcrostructure was investigated using a series of experiments and simulations. The results showed that a low remelting rate could produce a small grain growth angle （GGA） ; the average secondary dendrite arm spacing （SDAS） firstly decreased and then increased as the remelting rate increased. An excessively high or low remelting rate can increase the GGA and average SDAS in ingots. Thus, the remelting rate should be controlled within a suitable range to reduce composition microsegregation and microshrinkage in the ingot to produce an ESR ingot with satisfactory hot forging performance.

关键词： electroslag remelting macrostructure microstructure remelting rate secondary dendrite arm spacing

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