铝合金熔炼过程中采用电磁泵搅拌的优点

介绍电磁泵在铝合金熔炼中的应用状况及采用电磁泵搅拌铝熔体的主要优点。电磁泵搅拌铝熔体在许多大铝业公司已采用。它具有减小铝合金熔体温度差,提高铝合金炉料熔化速度,使熔体成分均匀,降低能耗等优点。     

电磁搅拌技术在铸造铝合金熔炼中的应用

把电磁搅拌枝术应用到铝合金熔炼过程中，显示了该技术的优良特性。熔炼时间缩短了，熔体温度下降了近５０℃，吨纯铝节省电能２００ｋＷｈ，且化学成分稳定、均匀，产能、质量都获得提高。操作者的劳动强度减轻。电磁搅拌器在使用过程中基本上不用维修，操作简单，运行令人满意。     

“为再生金属行业研制更环保节能的搅拌设备是我的天职”——直流励磁旋转式炉底电磁搅拌器的发明者张森林访谈

在金属的熔炼过程中,熔体的搅拌是工艺中最重要的过程之一。近年来,我国再生铝产业发展十分迅速,对熔体的搅拌效果和搅拌设备的要求也越来越高。正所谓工欲善其事,必先利其器。搅拌设备在冶炼工艺的熔炼和凝固过程中,使用电磁搅拌对于金属铸造质量、熔炼过程、合金结构、材料性能以及节约能源与环境保护,对于提高金属收得率,都有着十分重要的作用。     

电磁搅拌器对提高铝熔体质量的作用

电磁搅拌器已成为美国、欧洲和日本等国家和地区铝熔化炉和铝保温炉的标准配置件。电磁搅拌技术对提高铝合金熔体均匀化、提高熔体质量、缩短铝熔炼时间、节约能源、减少铝氧化夹渣等方面有良好的作用     

铝熔铸用直流电磁搅拌器的研究与应用

一、概述 非接触式磁力搅拌是目前大量推广应用的一种搅拌技术,它能够减少熔液污染,缩短熔炼时间、减少熔液烧损及炉渣形成,提高品质及生产效率、降低工人劳动强度.具有显著的经济效益和社会效益.目前国内所采用的磁力搅拌主要是永磁搅拌器、交流电磁搅拌器.永磁搅拌器虽然具有高可靠性,能耗低,但由于磁性材料限制开采,价格较高,在使用...     

硬质合金用立式搅拌球磨机的研究

搅拌球磨效率高、能耗低,在很多领域得到广泛应用。在硬质合金的使用中,尚存在物料不均匀、设备对料造成污染、混合料增氧、以及循环泵易坏等问题。研制的新型立式搅拌球磨机采用半球底筒体、销棒搅拌结构、双重密封装置、过滤装置等着重克服以上缺点,生产实践证明,该设备球磨效率高、能耗低,生产的混合料及合金质量均达到标准要求。     

熔配法制备新型Al-Ti-B-RE中间合金的研究

采用熔配法制备新型的铝晶粒细化剂—Al-Ti-B-RE中间合金,在铝熔体中同时加入钛粉、氟硼酸钾和稀土元素,该工艺具有生产的产品质量稳定、生产效率高、能耗低等特点。通过试验,用熔配法制备Al-Ti-B-RE中间合金的关键性工艺参数为:熔体在800℃～850℃静置30 min,多次强力搅拌。利用X射线衍射、电镜(SEM)等分析技术分析研究了Al-Ti-B-RE中间合金的组织,第二相粒子分布均匀、无偏析。证明选用的参数是可行性的、合理性的。     

690镍基焊接材料的制备

0前言真空感应炉熔炼和其它类型电弧炉熔炼相比较[1],优点主要是加热速度快、设备生产率高、氧化损失少,金属在坩埚内进行熔炼,由于存在电磁搅拌,有利于脱气以及合金成分的均匀化;但是通过对真空感应炉生产工况的分析,发现还存在许多问题,如能耗     

长落叶搅拌桨的研究与应用

利用对薄叶搅拌浆的搅拌特性的分析研究研究设计因液相混合搅拌装置，并通过与落后的挂链式搅拌器装机功率的对比和使用厂家所提供的搅拌均匀程度测定数据，说明长薄叶搅拌桨具有的节省能耗，搅拌效果均匀的优点，尤其在氧化铝生产设备趋向于大型化的今天，应用该成果可取得更好的经济效益和社会效益。     

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。     

方坯连铸永磁搅拌技术的发展现状与展望

电磁搅拌已经成为连铸工艺中改善铸坯质量的重要技术手段。相较于传统的三相交流电磁搅拌(EMS),基于烧结钕铁硼材料的旋转永磁体搅拌(PMS)具有磁感应强度较大、电能消耗低、结构较简单等优点。主要对比了电磁搅拌和永磁搅拌的技术特点,介绍了永磁搅拌在方坯连铸结晶器和凝固末端的应用现状;结晶器内永磁搅拌有效改善了铸坯的表面和内部质量,表面小孔缺陷明显减少,改善铸坯中心疏松和中心碳偏析;而应用于高碳钢连铸凝固末端,随着永磁搅拌磁体转速的增加,铸坯中心碳偏析指数明显降低,同时吨钢电能消耗仅约为传统电磁搅拌的15%。     

Effect of Electromagnetic Stirring Conditions on Grain Size Characteristic of Wrought Aluminum for Rheo-forging

This article focuses on the microstructural characteristics of A6061 and A7075 wrought Al alloy slurries fabricated by an electromagnetic stirrer (EMS). Billets fabricated by electromagnetic stirrer under different conditions of stirring current, stirring time, and pouring temperatures were investigated for the microstructure and cooling curves of molten alloy which was directly cooled from liquid state to the mushy state during stirring. From the cooling curves and microstructure examination, it is possible to determine the forming time and stirring time required to obtain an optimum structure. Lower pouring temperatures in the range (650–730 °C) led to finer primary-α Al phase grains in both A7075 and A6061 billets. Higher stirring current led to the finer primary-α Al phase. With respect to the effect of stirring time, the primary-α Al phase still appears in dendritic shape for 20 and 40 s of electromagnetic stirring time. The longer electromagnetic stirring time of 60 s led to a finer primary-α Al phase.     

电磁搅拌宽厚板结晶器内钢液流动和液面波动

为合理控制宽厚板结晶器内的钢液流动和液面波动,提高铸坯质量。通过数值模拟的方法研究了2 200 mm×250 mm连铸结晶器内的钢液流动和液面波动行为。考察了搅拌位置对流动和液面波动行为的影响规律。结果表明,电磁搅拌可增强上回流区域钢液流动,有利于均匀钢液成分和温度。电磁搅拌可使水口附近钢液的流速增加约0.04 m/s,增强了对水口附近钢液的搅拌。提高搅拌位置,搅拌产生的水平旋流增强了下返流流速,使熔池内下涡心位置上移。钢液的水平旋流使上返流发生偏转,减弱了上返流流速,降低了对液面的直接冲击,减小液面波动。适当提高电磁搅拌器位置有利于控制液面波动。电磁搅拌器中心位置Y=-0.1 m时,液面波动可由7.5 mm降低到3 mm以内,可减小液面卷渣,流场具有很好的对称性。     

Influence of stirring speed on SiC particles distribution in A356 liquid

A straight-blade mechanical stirrer was designed to stir A356-3.5vol％SiCp liquid in a cylindrical crucible with the capability of systematically investigating the influence of rotating speed of stirrer...     

Preparation of semi-solid AlSi7Mg alloy slurry with big capability

Semi-solid AlSi7Mg alloy slurry was prepared by low superheat pouring and weak traveling-wave electromagnetic stirring.The effects of pouring temperature and stirring power on the microstructure of AlSi7Mg alloy slurry were studied.The results show that the semi-solid AlSi7Mg alloy slurry of 5 kg can be prepared.This new technology can save energy and make the pouring process convenient.When the pouring temperature is decreased at a stirring power of 0.41 kW,the shape of primary α-Al grains gradually changes from dendritic-like to spherical.When the alloy melt is poured at the temperature(630°C) with a certain superheat,the pouring process becomes easier,and the spherical microstructure of AlSi7Mg alloy slurry can be prepared by the weak traveling-wave electromagnetic stirring.When the pouring temperature is 630°C,increasing the stirring power appropriately can result in better spherical primary α-Al grains,but if the stirring power is increased to a certain value(1.72 kW),the shape of primary α-Al grains does not obviously improve when the stirring power is continually increased.     

INFLUENCE OF ELECTROMAGNETIC STIRRING ON DENDRITIC STRUCTURE AND MECHANICAL PROPERTIES OF LOW SULPHUR STEEL

The melt flow induced by the electromagnetic stirring in the molten low sulphur steel may re-fine the original austenite grains,but widen the secondary denritic arm spacings.As a result,the ultimate tensile strength of the steel will be improved and the reduction of area will be re-markably decreased.The microalloying by an addition of Ce may retard the unfavourable ef-fect of the electromagnetic stirring.     

电磁搅拌对低硫钢枝晶组织及机械性能的影响

在凝固过程中,电磁搅拌所导致的熔体流动使钢的原始奥氏体晶粒得到了细化;但却粗化了二次枝晶臂间距,其结果。使抗拉强度提高,并使断面收缩率明显下降。微量Ce的加入能够抑制电磁搅拌的不利作用。     

超声振动对半固态AZ61镁合金微观组织的影响研究

利用自行设计和研制的一套超声振动装置,试验研究超声导入温度、超声输出功率和超声处理时间对半固态AZ61镁合金微观组织的影响。试验结果表明,在半固态区间,只有将AZ61镁合金熔体控制在合适的温度时,才能获得细小、均匀的半固态球状组织;当超声振动时间为60 s时,对半固态AZ61镁合金超声处理的效果最好;随着超声振动功率的增加,熔体中的颗粒直径呈不断下降的趋势,晶粒尺寸得到的明显细化,形状趋于圆整。     

Effect of electromagnetic stirring on solidification structure of austenitic stainless steel in horizontal continuous casting

An investigation on the influence of low frequency rotary electromagnetic stirring on solidification structure of austenitic stainless steel in horizontal continuous casting was experimentally conducted and carried out on an industrial trial basis. The results show that application of appropriate electromagnetic stirring parameters can obviously improve the macrostructure of austenitic stainless steel, in which both columnar and equiaxed grains can be greatly refined and shrinkage porosity or cavity zone along centerline can be remarkably decreased due to eliminating intracrystalline and enlarging equiaxed grains zone. The industrial trials verify that the electromagnetic stirring intensity of austenitic stainless steel should be higher than that of plain carbon steel. Electromagnetic stirring has somewhat affected the macrostructure of austenitic stainless steel even if the magnetic flux density of the electromagnetic stirring reaches 90 mT (amplitude reaches 141 mT ) in average at frequency f=3-4Hz, which provides a reference for the optimization of design and process parameters when applying the rotary electromagnetic stirrer