电热法生产硅铝合金

在矿热电炉内用碳共还原铝土矿和硅矿石生产硅基铝合金取得满意效果。本文介绍了冶炼过程中的主要化学反应及特点，指出了生产中应注意的问题。     

电热法生产硅铝合金

在矿热电炉内用碳共还原铝土矿和硅矿石生产硅基铝合金取得满意效果。本文介绍了冶炼过程中的主要化学反应及特点，指出了生产中应注意的问题。     

在矿热炉内用自焙电极生产硅铝合金

本文阐述了在矿热炉内自焙电极生产硅铝合金的冶炼原理，炉型特点，原料要求，工艺要点，技术经济分析及该工艺的前景展望。     

使用复合还原剂熔炼硅锰合金工艺的试验研究

在锰质铁合金熔炼过程中,提高主要元素回收率,改善技术经济指标的途径之一是使用复合还原剂。硅铝合金生产的废渣便是这种复合还原剂(表1)。硅铝合金系采用改进了的电热法熔炼。这样,可以应用大型冶炼设备并可利用国产硅酸铝原料。     

矿热炉冶炼硅钙钡铝合金

硅钙钡铝合金为钡系合金中高级复合合金,是含钡合金中强脱氧,脱硫剂。它是特殊钢常用的终脱氧剂,使钢中的氧达到最低(4.3ppm);同时形成含钙、钡、铝等复杂夹杂物易从钢中上浮,纯洁钢液,提高钢的内在质量。目前生产方法有:(1)硅铝合金冶炼加入石灰、钡矿而成硅钙钡铝合金;(2)分层法冶炼硅钙钡合金加入铝土矿而成     

高炉低硅铁的冶炼实践

分析了高炉冶炼中硅的还原机理，根据分析结果明确了低硅冶炼应具备的条件。湘钢１＾＃高炉在低硅冶炼的攻关实践中，按低硅冶炼应具备的条件采取了相应的技术措施与管理措施，取得良好的经济效益。     

太钢高炉降硅冶炼技术

通过对太钢高炉降硅冶炼进行大量的理论分析与实验研究，得出了铁水硅质量分数的影响因素，找到了降硅冶炼的有效途径，达到铁水低硅冶炼的目的，铁水质量有了明显的提高。     

宝钢1号高炉低硅冶炼技术

介绍了宝钢1号高炉在炉龄中、后期实施低硅冶炼的目的，低硅冶炼应具备的条件和需要解决的准点一在低硅冶炼时期所采取的技术措施和管理措施，低硅冶炼的技术经济指标和经济效益。     

湘钢2^#高炉的降硅冶炼

介绍了湘钢２＾＃高炉在降硅冶炼中所采取的措施与经验，以及取得较好效果的情况，该高炉已逐步由降硅冶炼向低硅冶炼过渡。     

宝钢1号高炉低硅冶炼操作实践

宝钢1号高炉近几年采用低硅冶炼技术使铁水含硅量一直控制在0．26％－0．35％的较低水平，结合宝钢1号高炉生产操作指标，分析了高炉产量，燃料条件以及冶炼特点对低硅冶炼的影响，为高炉冶炼进一步降低铁水含硅量提供了思路。     

Study on Improving Solidification Structure of Rare Earth Al-Si Alloys with Electropulse Acting on Liquid Alloy

Electropulse modification (EPM) process, a new physical field method for improving the solidification structure of metals was introduced.Different from other research, EPM is only acting pulse current on melt under liquid state.The solidification structure of Al-Si alloys, A1-Cu alloys,cast iron and steel can be modified obviously with this method: the solidification structure of ZL101 alloy presented the Na and Sr modification and the mechanical properties were enhanced; a large number of primary silicon appeared in the microstructure of ZL109 alloy; the equiaxed grain zone was expanded and the grains were fined in Al-5.0wt% Cu alloy; the graphitization took place in solidification process of molten cast iron; the grain sizes of solidification structure of T8 steel were reduced significantly and the shape of steel pearlites also changed; the equiaxed grain zone increased to 88% from original untreated 19%, the equiaxed grains were fined and the intercrystalline crack was avoided in concasting billet by continuously treating liquid electrical sheet steel in tundish.Effects of rare earths on casting Al-Si alloys were also summarized.The method of modifying the solidification structure of rare earth Al-Si alloys with EPM in producing the alloys was proposed.     

稀土在Al-Si活塞合金中的作用及其机理

Al-Si合金常作为一种高质量活塞合金广泛应用于内燃机生产中,在Al-Si活塞合金中添加稀土元素可以明显改善合金的机械力学性能和铸造加工性能。本文概述了稀土在Al-Si活塞合金中的作用。通过对大量试验研究结果的分析,着重论述了稀土对Al-Si活塞合金的细化变质、脱氧、除气和除Fe的作用及其机理,对进一步开展稀土在铝硅合金中的细化变质等应用研究具有广泛的理论和现实意义。     

Wetting behaviour in the Al-Si/SiC system: interface reactions and solubility effects

The sessile drop technique was used to study the wetting behaviour of Al-Si alloys on SiC sintered ceramic substrates under vacuum in the 700–1100°C temperature interval. Al-Si alloys with Si concentrations up to 50% were tested. An expected non-wetting/wetting transition was observed at 900–1000°C due to the presence of an alumina film surrounding the molten alloy. At higher temperatures wetting was observed and the Si concentration of the alloy has a marked effect on the measured contact angles, θ. At 1100°C θ decreases from 55° to 25° when instead of pure al and A112.3%Si or an A116.6%Si alloy is used. The suppression of the formation of a continuous Al₄C₃ layer at the interface and a process of dissolution and reconstruction of the SiC surface, due to the increased Si concentration of the Al-Si alloys, are the key factors to explain the observed behaviour.     

Al—3B中间合金的加工量对亚共晶Al—Si合金晶粒细化的影响

研究了Al-3B中间合金不同的加入量对亚共晶Al-Si合金晶粒尺寸的影响。该中间合金对所研究全部范围内的Al-Si合金都具有一定的细化效果,但在不同的含硅量下其细化能力并不相同,同时证实对未经细化处理的亚共晶Al-Si合金而言,在含硅量约3%（质量分数,下同）时合金具有最小的晶粒尺寸。随着Al-3B中间合金加入量的提高,出现最小晶粒尺寸的合成成分向高硅方向移动,当加入量达到1%时,在含硅量为6%的Al-Si合金中出现最小的晶粒尺寸。     

电热法生产铸造用共晶铝硅合金的能耗分析

介绍了电热法生产铸造用铝硅合金的工艺流程,同时对兑掺法和电热法生产铸造用铝硅合金的能耗进行了分析,结果表明：电热法生产共晶铝硅合金与兑掺法相比可节能5%以上,成本可降低700元以上。     

合金化Cr优化含Fe过共晶Al-Si合金显微组织及其机制

采用传统铸造工艺和喷射成形技术制备了无Cr和含Cr的含Fe过共晶Al-Si合金,并利用SEM(EDS)、XRD及DSC对其显微组织、相组成及相变过程进行了研究。结果表明:2%Cr的加入不光使铸态粗大针片状的δ-Al4FeSi2相变为"骨骼状"α-Al(Fe,Cr)Si相,而且使沉积态Al-25Si-5Fe-3Cu合金中短棒状的富铁相(～10μm左右)被尺寸小于3～5μm的颗粒状α-Al(Fe,Cr)Si相所替代,从而细化的组织更有利于合金性能的提高。等温处理实验结果显示沉积态含Cr合金具有较好的组织热稳定性,其主要归因于颗粒状α-Al(Fe,Cr)Si相自身的高温稳定性,而沉积态Al-25Si-5Fe-3Cu合金热稳定差主要由于β-Al5FeSi相的长大和A7Cu2Fe相的形成。另外,结合显微组织和喷射成形工艺特点对沉积态组织形成机制分析发现α-Al(Fe,Cr)Si相有可能通过直接从液相析出和经δ-Al(Fe,Cr)Si相转变而来。     

快速凝固铝硅合金的性能、应用及发展方向

利用快速凝固技术制备Al-Si合金可显著改善合金组织,大幅度提高合金性能,使合金具有良好耐磨、耐热性,高强,质轻及低热膨胀系数等特点,在汽车、电子和宇航工业中具有广泛应用潜力。本文主要对上述问题进行综述,并提出在快速凝固Al-Si合金研究中存在问题和发展方向。     

Effect of iron (Wt.%) on adhesive wear response of Al-12Si-1Cu-0.1Mg alloy in dry sliding conditions

The presence of iron leads to different types of intermetallics in Al-Si alloys, among them needle shaped β-phase (Al₅FeSi) can lead to variations in hardness of the Al-Si alloy which ultimately can affect the wear resistance of the alloy. In this paper, the effect of iron on wear behavior of cast Al-Si alloys has been reported. Sliding wear behavior of eutectic alloy Al-12Si-1Cu-0.1Mg was investigated in dry sliding conditions by using pin-on-disk test configuration against heat treated EN31 steel counter-surface at room temperature. Sliding wear behavior has been evaluated at four normal loads of 5, 20, 50 and 70 N and two sliding speeds, 2 m/s and 4 m/s. Worn pin surfaces were examined by scanning electron microscopy (SEM) for analyzing wear mechanisms. The wear mechanism has been found to be mild oxidative type at lower sliding speed of 2m/s for entire range of loads used in the study. Transition to severe metallic wear occurs at higher sliding speed of 4 m/s at normal load of 5 N. Hardness of the alloy increased with increase in iron addition primarily due to presence of needle shaped Fe-rich intermetallics but it leads to an increased wear rate.     

Hereditary influence of the structure of charge materials on the density of aluminum alloys of the Al-Si system

The influence of dispersity of charge silicon and structure of initial charge alloys on the density of silumins of the Al-Si system is investigated using the improved express-method for determining the melt density. It is established that the structure of charge materials substantially and stably affects this characteristic, which should be taken into account in preparation technologies of alloys of the Al-Si system.     

Microstructure and Wear Behavior of Solidification Sonoprocessed B390 Hypereutectic Al-Si Alloy

The hypereutectic Al-Si alloys constitute an important family of alloys because of their excellent wear resistance and low thermal expansion. However, the optimal microstructure and hence the optimal service performance of these alloys cannot be achieved by the conventional melt treatments used in industry today, because of the chemical incompatibility between the primary-Si refiners and the eutectic-Si modifiers used in microstructure control. The current study aimed at using ultrasonic vibrations to improve the microstructure and the properties of these alloys. The results of the current study showed that for the B390 Al-Si alloy (i) the ultrasonic treatment has potential refining effect on the primary Si and Fe intermetallic phases, (ii) the primary Si particles become finer as the pouring temperature decreases from 1033 K (760 °C) to 938 K (665 °C), (iii) pouring and ultrasonic treatment at temperatures below the start of primary Si precipitation result in the coexistence of large and fine Si particles in microstructure, (iv) phosphorous additions of 50 ppm did not show any substantial effect in the ultrasonically treated ingots, (v) ultrasonic-treated samples have uniform hardness over the surface while the untreated samples show large scattering (high standard deviation) in hardness levels and (vi) ultrasonic-treated samples showed better wear resistance in the absence of phosphorous.