ML08Al连铸铝损原因分析及改进措施

分析了ML08Al连铸过程的铝损产生的原因,并提出了相应的解决措施。

冶炼工艺参数对铝熔炼烧损的影响及其控制研究

冶炼工艺中铝的烧损问题对工业生产构成重要挑战。本研究深入分析了影响铝熔炼烧损的主要工艺参数,通过实验模拟、数据采集与分析,揭示了温度、氧气含量和冶炼时间与铝烧损量的直接关系。通过调整这些参数,成功降低了铝的烧损量并提升了冶炼效率。研究发现,提高冶炼温度能减少氧气对铝的氧化反应,而延长冶炼时间则有助于氧气充分参与反应,进而减少烧损。本研究为铝熔炼过程烧损控制提供了理论支持和实践参考,对工业生产具有重要意义。

氩气保护对电渣重熔气阀钢NCF3015铝钛烧损的影响

气阀钢NCF3015Φ280 mm×1700 mm电极(/%:0.03~0.08C,13.5~15.5Cr,30~33.5Ni,1.7~2.1Al,2.4~2.9Ti,0.65~0.80Mo,0.65~0.80Nb,0.002~0.006B)经全同轴式惰性气体保护电渣重熔成Φ340 mm0.80 t电渣锭。在使用三元预熔渣70CaF_(2)-15Al_(2)O_(3)-15CaO以熔速为4 kg/min的全氩气保护条件下,试验了气阀钢NCF3015电渣过程中Al、Ti烧损的烧损量及Si的变化情况和脱S率,并阐述了机理。结果表明,Al相对Ti是主要的烧损元素,Al的平均烧损量为-0.071%,Ti的平均烧损量为-0.035%。从底部至顶部Al,Ti的烧损都逐渐减小,与常规电渣重熔烧损率相比,氩气保护对减小Al,Ti的烧损作用显著。Al、Ti的烧损导致重熔初期Si含量略增。该渣系有一定的脱硫效果,平均脱S率36.7%。

浅谈铸轧生产中降低铝熔损的方法

铝加工生产过程中的加料方法、炉子工况、扒渣操作、工艺废品及炉渣处理等因素,均能造成金属熔损增加,影响产品质量,增加生产成本。文章针对以上问题,分析各影响因素,并给出了相应的解决方法。

浅谈降低铸造过程中铝液烧损的途径

本文系统分析了铝液铸造过程中可能存在的铝液烧损因素,并从工艺、生产组织、岗位操作、设备改造等几个方面提出了降低铝液烧损的途径。

新型精炼剂在电解铝生产中的应用试验

铝在熔炼过程中需要通过精炼来去除气体和夹杂物,选择正确的精炼剂非常重要。通过应用试验表明,采用的新型精炼剂环保、无毒;无自发热现象,有效减少因熔渣自发热温度高带来的铝烧损问题;铝液与渣的分离效果好,且产渣量少,同样条件下产渣降低40%。

经喷砂处理后亚光架空导线的铝单线性能

对比分折了多种铝表面亚光处理方法,其中喷砂处理法最简单、易实现,符合线缆行业产品连续生产的特点,检测了经喷砂处理后钢芯铝绞线(ACSR)的表面反射度,比较分析了喷砂处理前后钢芯铝绞线铝单线的电性能、机械性能、铝损情况。试验表明,利用喷砂处理法生产的亚光架空导线,其各项性能符合工程应用要求。

立吊式阳极氧化铝材预处理工艺改进

原来的立吊式阳极氧化铝型材预处理工艺需用7个处理槽,处理周期长达17 min,铝损多,能耗大。采用新的预处理液ZT-1将脱脂、碱洗、中和三工序功能集于一体。新处理液技术的工艺简单、只需要3个处理槽,处理周期缩短4 min,且节能、降耗、环保。并且通过试验表明,新预处理液的去污能力强,对铝合金型材阳极氧化膜的外观、膜层厚度、封孔质量没有负面影响,有些质量指标超过了原工艺生产的阳极氧化铝合金型材的质量指标。

双流板坯连铸低碳铝镇静钢钢水黏分析与改进

针对柳钢新150 t转炉系统双流板坯连铸机单流起机钢水黏事故进行分析,分析引起钢水可浇性差的原因,介绍实施的加强炉后脱氧、优化精炼渣系、减少铝损、更改透气砖结构、提高中包烘烤效果等措施及其效果。

新一代环保型GFLUX-J100颗粒状熔合精炼剂在铝合金熔铸中的应用

对新一代环保型GFLUX-J100颗粒状熔合精炼剂在铝合金精炼中除碱、除渣、除气以及降低铝烧损的功效进行了试验和分析。结果表明,该精炼剂在使用时基本无烟无毒,除去夹杂物的效果远优于传统粉末混合精炼剂的,除去碱金属钠、锂、钙的效果达到活性含氯气体的精炼水平。同时,可以显著降低铝的烧损。

含铝品种钢的无氧化保护浇铸技术创新与应用

为实现连铸工序全程无氧化保护浇铸生产,河钢宣钢二钢轧厂针对现有连铸工艺和设备设施不能满足含铝品种钢高质量要求的现状进行了一系列技术创新。通过研制新型钢包长水口、长水口清洗装置、中间包水口对中装置、浸入式水口氩封保护装置以及工艺技术优化等一系列措施,杜绝了钢水的二次氧化,有效地控制了连铸钢水的增氧量、增氮量和铝烧损,提高了钢水的洁净度,提升了含铝品种钢的质量稳定性,满足了高端客户的产品质量要求,在钢铁行业内具有较好的推广价值。

Evaluation of varying ductile fracture criterion for 7075 aluminum alloy

As one of the principal failures,ductile fracturing restricts metal forming process.Cockcroft-Latham type fracture criterion is suited for ductile fracture in bulk metal-forming simulation.Finding a way to evaluate the ductile fracture criterion（DFC） and identify the relationship between DFC and deformation conditions for a strain-softening material,7075 aluminum alloy;however,it is a non-trivial issue that still needs to be addressed in a greater depth.An innovative approach is brought forth that the compression tests and numerical simulations provide mutual support to evaluate the ductile damage cumulating process and determine the DFC diagram.One of the results shows that for a fixed temperature,the maximum cumulated damage decreases regularly with increasing strain rate.The most important result shows that DFC of 7075 aluminum alloy at temperatures of 573-723 K and strain rates of 0.01-10 s-1 is not a constant but a change in a range of 0.255-0.453,thus it has been defined with varying ductile fracture criterion（VDFC） and characterized by a function of strain rate and temperature.According to VDFC diagram,the exact fracture moment and position during various forming processes will be predicted conveniently,in addition to which,the deformation domains with lower fracture risk corresponding to higher VDFC can be identified.

Effect of individual and combined additions of Al-5Ti-B,Mn and Sn on sliding wear behavior of A356 alloy

The effect of grain refiner, Mn and Sn additions on the sliding wear behavior of A356 aluminum alloys was investigated. The microstructure and worn surfaces of the studied alloys were characterized by optical microscopy（OM）, scanning electron microscopy（SEM）, and transmission electron microscopy（TEM）. The experimental results indicate that the alloy refined by Al-5Ti-B alloy exhibits equiaxed α（Al） dendrites and performs better wear resistance compared with the alloy without the grain refiner. Moreover, the addition of Mn can change the β-Al5 Fe Si phase to α-Al（Mn,Fe）Si phase and reduce the possibility of crack formation, thus improving the wear resistance. Sn added to A356 aluminum alloy forms Mg2 Sn precipitates after heat treatment. Therefore, the unrealizable precipitation hardening Mg2 Si phase and the softening β-Sn phase can reduce the hardness of the alloy, and finally reduce the wear resistance.

薄板坯连铸保护浇注工艺研究

钢水在浇注过程中如果保护措施不到位,空气很容易进入钢水并导致其氧含量和氮含量增加,从而恶化钢水质量。通过研究首钢京唐公司MCCR产线连铸保护浇注工艺,分析了钢包自开率、钢包下渣检测系统、钢包长水口+中间包保护浇注等因素对保护浇注的影响,并提出了相应的保护浇注措施。实施后,中间包铝损和铝比合格率不断上升,铸机保护浇注效果良好。

Review on corrosion-wear resistance performance of materials in molten aluminum and its alloys

The failure caused by the corrosion-wear of molten aluminum and its alloys is one of the main problems in aluminum industry. In this work, the resistance behavior of various materials, including Fe-based alloys, ceramics and corresponding high apparatus of corrosion-wear in molten aluminum and its alloys, were reviewed. The synergistic effect of corrosion and wear was discussed based on corrosion and wear mechanics. The effects of dynamic agitation due to rotating of friction pairs, physical property of liquid metal and size of grain etc., on the corrosion-wear resistance performance were investigated. In addition, the characteristics of corrosion-wear resistance performance of materials in molten aluminum and its alloy were summarized. According to our recent progress referred to kinds of materials, especially a TiA13/Ti3A1C2/A1203 composite, the ceramics/metal composites with a co-continuous structure will be of great advantage in the field of corrosion-wear environment of molten aluminum and its alloys.

TOOL WEAR PATTERNS AND MECHANISMS OF SOLID CEMENTED CARBIDE IN HIGH-SPEED MILLING OF ALUMINUM ALLOY

The wear patterns and wear mechanisms of solid cemented carbide are analyzed in high-speed milling of aluminum alloy. Results show that the dominant wear patterns are coating damage, crater wear, micro-chipping, breakage, and so on. The main wear mechanisms are adhesion, diffusion and fatigue. Compared with conventional speed machining, the effect and impact of thermal-dynamical coupling field play an important role in the cutting tool wear in high-speed milling of aluminum alloy.

大包保护浇注效果改进

从大包长水口尺寸及质量、长水口的连接密封、大包自开率、中包钢液面的保护浇注等方面分析了大包保护浇注的影响因素,通过采取改进长水口尺寸及质量、控制长水口的连接密封、提高大包自开率等一系列措施,生产得以稳定,保护浇注效果得以提升。

IMPACT-SLIDING WEAR OF MATERIALS

A simple impact-sliding wear test rig is designed for studying the wear behavior between solid materials on a repetitive normal impact accompanied with the tangential sliding. The test rig consists of a cantilever beam forced by the dynamoelectric vibration exciter and a rotational shaft driven by a spindle. It has a widely adjustable range of testing parameters, including the impact frequency, the impact load and the sliding velocity. The avail- able maximum impact frequency, impact load and sliding velocity are 100 Hz, 200 N and 4.52 m/s, respectively. To evaluate the capability of the test rig, tests are carried out and the impact load is measured. Results show that the test rig has the good repeatability under the same test conditions and the repeatable error is less than 7%. Furthermore, non-destructive examination results by the mass loss method, two-dimensional profilometry and the scanning electron microscopy （SEM） show that the test rig can meet the demands for the impact-sliding wear.

Inconel718高温合金电渣重熔铝钛元素烧损热力学分析

为了研究Inconel718高温合金电渣重熔过程中渣系各组元对合金中易氧化元素铝、钛的影响,以五元渣系CaF_2-CaO-Al_2O_3-MgO-TiO_2为基,通过分子与离子共存理论,根据渣金界面中各组元的平衡反应和物质守恒,建立了Inconel718高温合金电渣重熔过程中渣金界面铝、钛元素氧化反应的热力学模型。通过分析该模型并对模型结果进行渣金平衡验证试验,验证了模型的有效性。研究结果表明,渣中CaF_2、MgO质量分数的变化对合金中铝、钛元素的影响很小;渣中Al_2O_3有烧钛增铝的作用,TiO_2有烧铝增钛的作用,CaO能够抑制铝元素的烧损;能够有效减少Inconel718高温合金电渣重熔过程中铝、钛元素烧损的渣系配比为CaO质量分数为20%～25%、TiO_2质量分数为4%～6%、MgO质量分数为1%～4%、CaF_2质量分数为50%～60%、Al_2O_3质量分数为15%～20%。

Damage and penetration behavior of aluminum foam at various impacts

In this work, the damage and penetration behavior of aluminum foam at various types of impact were examined through experiments. The impact energy of a striker was applied on the fixed aluminum foam having a thickness of 25 mm while increasing its impact by 2 J at each strike from 6 J to 16 J. The results show that the impact energies from 6 J to 12 J could not penetrate aluminum foam. However, the aluminum foam applied with the impact energy of 12 J incurred severe damages on its lower part. Finally, the aluminum foam applied with the impact energy of 14 J was penetrated. The striker having the impact energy of 6 J could penetrate aluminum foam around 10 mm. At this moment, aluminum foam could absorb the impact energy of around 9 J. When the impact energy of 14 J was applied on the aluminum foam, the aluminum foam was penetrated and it absorbed the impact energy of around 17.2 J. It is possible to create the safer structure against impact using the results of this work. The simulation results for the verification of the experimental results imply that the results for all the experiments in this work are reliable. It is possible to predict the structural safety of the aluminum foam for an impact if the impact behavior of aluminum foam performed in this work is utilized.