电磁技术在冶金中的应用

对传统的电磁冶金技术如电磁悬浮熔炼技术、低频电磁铸造技术作了概要阐述,着重介绍了电磁搅拌技术,以及其他新技术,如磁偏析布料技术、电磁输运技术、板坯电磁侧封技术。对电磁搅拌的工作原理及搅拌方式作了论述,介绍了各种技术的基本原理,对各种技术的优缺点进行了阐述、比较。     

环缝式电磁搅拌制浆技术研究及其应用

电磁搅拌技术是最早应用于制备半固态坯料的方法之一,然而集肤效应限制了该技术的进一步发展。提出环缝式电磁搅拌技术旨在破解这一难题。与普通电磁搅拌相比,环缝能避开磁场较低的部分,在环缝内形成的均匀旋转磁场,可以获得均匀的温度场和均匀凝固的细小组织。环缝式电磁搅拌连铸坯组织呈蔷薇状,在铸坯中分布均匀。与普通电磁搅拌相比,环缝式电磁搅拌技术能明显降低宏观偏析和显微偏析。     

电磁搅拌铸造及其在镁合金上的应用

介绍了电磁搅拌技术的原理、分类及其对凝固组织的影响，分析了电磁搅拌过程中熔体的受力情况和感应热。目前，电磁搅拌在镁合金中的研究较少，电磁搅拌半连续铸造制备优质的镁合金铸锭是开发变形镁合金的关键，指出了镁合金的熔炼铸造特点、镁合金电磁搅拌半连续铸造存在的问题及发展的方向。     

电磁搅拌技术在废铝回收中的应用

一、电磁搅拌技术的应用电磁搅拌技术在原铝生产中已经得到了广泛的应用,实施电磁搅拌技术不仅可以使熔体的合金成分均匀,而且可以减少烧损,提高熔化速度,减少能源消耗,提高劳动生产效率,是一项综合效益很好的技术措施。在废铝回收过程中采用电磁搅拌技术可以提高能源的利用效率,提高实     

方坯连铸电磁搅拌技术的发展动向

本文简述了中、高碳钢连铸结晶器电磁搅拌技术存在的一些问题,并综述了电磁搅拌技术的新发展。     

ABB公司的电磁搅拌装置进展

电磁搅拌(EMS)技术在铝熔炼炉和静置炉的铝水搅拌中的应用已是成熟和成功的技术,本文概述了ABB公司自动化系统对提高劳动生产率和节省成本的贡献。 自从1968年ABB公司向美国凯撒铝和化学公司提供第一台铝熔炼炉的电磁搅拌装置以来,目前在全世界已有100多台铝熔炼炉电磁搅拌装置在全世界运行,电磁搅拌装置明     

电磁搅拌技术在废铝回收中的应用

一、电磁搅拌技术的应用 电磁搅拌技术在原铝生产中已经得到了广泛的应用,实施电磁搅拌技术不仅可以使熔体的合金成分均匀,而且可以减少烧损,提高熔化速度,减少能源消耗,提高劳动生产效率,是一项综合效益很好的技术措施.     

连铸电磁冶金技术：第三讲：方坯连铸电磁搅拌技术的若干问题

方坯连铸电磁搅拌技术历经了近30年的发展,总的说已相当成熟,对改善铸坯质量起了积极的作用,成为连铸技术的重要一环。但在具体配置和实际运用这一技术时,仍然会产生一些问题,从而影响电磁搅拌技术的有效运用。本文根据连铸电磁搅拌技术实践中提出的问题,作一综述,以期引起广大连铸工作者的注意。     

河北优利科电气有限公司

系列电磁搅拌装置 自1989年我国首台实用的铝熔炉用电磁搅拌装置问世以来，至今大量的应用实践都证明。采用电磁搅拌装置实施搅拌充分，方便，可确保铝及铝合金的产品质量。可缩短铝锭的熔化时间，减少能源消耗，是提高产品质量和经济效益的有效技术措施。电磁搅拌装置已经成为铝熔铸行业的必备设备。     

铝水包电磁搅拌技术介绍

目前全球有400多套电磁搅拌系统正在运行.在中国,电磁搅拌已经被认为是铝熔炉生产的标准技术.这一项成熟的技术,由于保证了改进热传导质量、反应动力快,可降低周期时间,从而实现更成本有效的运行而受到越来越多的关注.本文介绍了电磁搅拌技术在铝水包中的运用.     

电磁搅拌对AlSi7Mg合金显微组织的影响

采用自行开发的电磁搅拌器,研究了多种不同电磁搅拌方式,在不同工艺条件下,单独施加或复合施加对AlSi7Mg合金微观组织的影响。试验结果表明:单一施加旋转感应电磁搅拌时,浆料径向组织很不均匀;单一施加无芯感应电磁搅拌,当搅拌电流较小时,径向组织也不均匀,增大电流浆料质量有明显改善;采用(旋转感应+无芯感应)复合电磁场进行复合电磁搅拌时,可在电流较小时获得满意的浆料质量。     

电磁搅拌对AlSi7Mg合金显微组织的影响

采用自行开发的电磁搅拌器,研究了多种不同电磁搅拌方式,在不同工艺条件下,单独施加或复合施加对AlSi7Mg合金微观组织的影响.试验结果表明：单一施加旋转感应电磁搅拌时,浆料径向组织很不均匀;单一施加无芯感应电磁搅拌,当搅拌电流较小时,径向组织也不均匀,增大电流浆料质量有明显改善;采用（旋转感应＋无芯感应）复合电磁场进行复合电磁搅拌时,可在电流较小时获得满意的浆料质量.     

Manufacture technique of semi-solid slurry of hypoeutectic Al-Si alloy by low superheat pouring and weak electromagnetic stirring

Semi-solid metal (SSM) process is a relatively new technology that offers distinct advantages over other near-net-shape casting processes, such as a more homogeneous microstructure, less porosity and segregation, and improved mechanical properties[1-3]. SSM can be divided into thixoforming and rheoforming, in which rheoforming is usually advantageous from the point of view of an energy and cost saving when compared with thixoforming, so rheoforming has been paid attention again by engineers i…     

Research on semi-solid slurry of a hypoeutectic Al-Si alloy prepared by low superheat pouring and weak electromagnetic stirring

The semi-solid slurry of a hypoeutectic Al-Si alloy was manufactured by low superheat pouring and weak electromagnetic stirring. The effects of pouting temperature and stirring power on the semi-solid slurry were investigated. The results indicated that the semi-solid slurry to satisfy rheocasting can be manufactured by low superheat pouring and weak electromagnetic stirring. The pouring temperature （or superheat） and the stirring power remarkably affected the morphology of primary α-Al and the size of primary α-Al, and there is no obvious effect of stirring time on primary α-Al. Compared with the samples made by low superheat pouring with no stirring, the nucleation rate, particle morphology and grain size of primary α-Al in A356 were markedly improved by low superheat pouring and weak electromagnetic stirring. On the condition of weak electromagnetic stirring, the pouring temperature with low superheat can be suitably raised to reach the effectiveness obtained from the lower pouring temperature without stirring.     

半固态金属浆料制备技术的研究进展

总结了30余年来半固态金属浆料制备技术的研究和应用现状,分别介绍了压室浆料制备技术、单螺旋机械搅拌浆料制备技术、双螺旋机械搅拌浆料制备技术、低过热度倾斜板浇注浆料制备技术、低过热度浇注和弱机械搅拌浆料制备技术、连续流变转换浆料制备技术、低过热度浇注和弱电磁搅拌浆料制备技术、蛇形通道浇注浆料制备技术、熔体分散混合浆料制备技术、转桶搅拌浆料制备技术、波浪倾斜板浇注浆料制备技术、旋转倾斜圆筒浆料制备技术、超声振动浆料制备技术、熔体处理和双向电磁搅拌浆料制备技术、低于液相线温度浆料制备技术、偏旋热焓平衡浆料制备技术、气泡搅拌浆料制备技术及其发展前景。     

电磁搅拌对铝铜合金宏观组织及偏析的影响

为了改善铝铜合金在铸造过程中出现的密度偏析,研究了电磁搅拌对半固态Al-Cu合金宏观组织及偏析的影响。结果表明:电磁搅拌使得初生α-Al的径向分布更为均匀,改善了铸件的宏观偏析,且随着搅拌强度的增大,初生α-Al的分布也更均匀,即宏观偏析越小;电磁搅拌使得宏观组织显著细化,随着搅拌强度的提高,晶粒细化程度反而减弱。     

Microstructures of AZ91D alloy solidified during electromagnetic stirring

With the help of an electromagnetic stirring device self-made and alloy melt quenching technology, the effect of electromagnetic stirring parameters on the microstructures of semi-solid AZ91D alloy was mainly studied at the stirring frequency of 200 Hz. The experimental results show that when the stirring power rises, the primary α-Mg rosettes in the semi-solid melt will bear stronger man-made temperature fluctuation and the root remehing effect of the dendritic arms is promoted so that the spherical primary α-Mg grains become much more and rounder. If the stirring frequency is 200 Hz, the ideal semi-solid microstructure of AZ91D magnesium alloy can be obtained when the stirring power is increased to 6.0 kW. If the stirring frequency is 200 Hz and the stirring power is 6.0 kW, it is found that the lower cooling rate is favorable for the spherical primary α-Mg grains to be developed during the electromagnetic stirring stage. If the AZ91D magnesium alloy billet prepared during electromagnetic stirring at the stirring frequency of 200 Hz and the stirring power of 6.0 kW is reheated to the solidus and liquidus temperature region,the primary α-Mg grain‘s shape will get more spherical, so it is very advantageous to the semi-solid thixoforming process     

电磁搅拌下铝合金的力学性能研究

研究了无搅拌铸造和电磁搅拌铸造下的Al-24%Si过共晶合金和Al-6.6%Si亚共晶合金常温下的力学性能,并运用扫描电镜对其拉伸断口进行了分析。结果表明:在搅拌作用下凝固的合金相比同成分非搅拌时凝固的合金,Al-24%Si过共晶合金强度提高了约11%,伸长率提高了约12%;Al-6.6%Si亚共晶合金强度提高了约5%,伸长率提高了约46%。过共晶合金在相同搅拌强度下,其硬度是随着降温速率的增大而增大的。亚共晶合金在搅拌强度相同时,降温速率越小,硬度就越高;合金降温速率相同时,搅拌强度越高,硬度就越高。     

Effect of Magnetic Suspension Force in Electromagnetic Stirring on Microstructure of Al-Si Alloy

Based on Maxwell equations, the Lorentz force in Al-Si alloy melt was calculated during the process of electromagnetic stirring using analytic approximation method. The effects of magnetic suspension force on the microstructure of Al-Si alloy were given under different electromagnetic stirring frequency. The surface layer for alloy melt (thickness is about skin depth) were under a larger magnetic suspension force in intermediate frequency electromagnetic stirring. As a result, it was found that Si phase ten...     

Simulation on solidification of an Al-Ni alloy under electromagnetic stirring

The microstructure of Al-Ni alloy has a significant influence on its performance,while electromagnetic stirring is one of the most effective methods for control of solidification structure of Al alloy....