Effects of low-frequency electromagnetic field on the surface quality of 7050 aluminum alloy ingots during the hot-top casting process

2011 ◽  
Vol 18 (2) ◽  
pp. 165-168 ◽  
Author(s):  
Xiang-jie Wang ◽  
Jian-zhong Cui ◽  
Yu-bo Zuo ◽  
Zhi-hao Zhao ◽  
Hai-tao Zhang
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Surface Quality ◽  
Low Frequency ◽  
Casting Process ◽  
Hot Top ◽  
7050 Aluminum Alloy

Effects of Low Frequency Electromagnetic Field on Cold-Shut Formation during Aluminium Alloy Hot-Top Casting

2011 ◽  
Vol 181-182 ◽  
pp. 130-133
Author(s):  
Xiang Jie Wang ◽  
Jian Zhong Cui ◽  
Yu Bo Zuo ◽  
Qing Feng Zhu
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Surface Quality ◽  
Low Frequency ◽  
Experimental Results ◽  
Cast Structure ◽  
Hot Top ◽  
Alloy Ingot ◽  
7050 Aluminum Alloy

On the basis of conventional hot-top casting, low frequency electromagnetic field was applied in the process of hot-top casting to produce 7050 aluminum alloy ingot, the influences of low frequency electromagnetic field on cold-shut have been studied. The experimental results show that under the effect of the low frequency electromagnetic filed, the depth of cold folding has been decreased, and the as-cast structure has been refined. The reasons for low frequency electromagnetic field improving the surface quality, refining the structure of the ingot were summarized.

Effects of Electromagnetic Field and Lubricate Condition on the Surface Quality of Aluminum Alloy Billet during LFEC Processing

2012 ◽  
Vol 268-270 ◽  
pp. 378-381
Author(s):  
Fu Qu ◽  
Jian Zhong Cui
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Surface Quality ◽  
High Surface ◽  
Low Frequency ◽  
High Surface Quality ◽  
Electro Magnetic ◽  
Lubricate Condition

The microstructures of the aluminum billets could be improved markedly by low-frequency electro-magnetic casting (LFEC) processing. In fact, the low-frequency electromagnetic field (LFEF) also has favorite effect on the surface quality of billet. However, few public reports on the surface quality of LFEC aluminum billets could be found. Therefore, a new crystallizer together with a kind of lubricant was designed aiming at lowing surface turning quantity, and the effects of casting velocity, electromagnetic condition and lubrication on the surface quality of aluminum billets were investigated. The results indicate that LFEF together with the lubricate condition would be responsible for the surface quality of the billets, and the high surface quality billets could be achieved by optimizing the casting conditions.

Effects of Low Frequency Electromagnetic Field on the Solidification Structure of 6063 Aluminum Alloy during Hot-Top Casting

2011 ◽  
Vol 675-677 ◽  
pp. 857-860
Author(s):  
Xiang Jie Wang ◽  
Jian Zhong Cui ◽  
Qing Feng Zhu
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Low Frequency ◽  
Casting Process ◽  
Liquid Pool ◽  
Solidification Structure ◽  
Cooling Curves ◽  
Melt Temperature ◽  
Hot Top ◽  
6063 Aluminum Alloy

Low frequency electromagnetic (LFE) field was applied during the conventional hot-top casting process. Thermocouples were used to measure the cooling curves from the border to the center of the ingot during steady-state of casting process, cooling curves were obtained, and effects of low frequency electromagnetic field on the solidification, macrostructure during the conventional hot-top casting for 6063 aluminum alloy process were analyzed. The experimental results show that the forced convection caused by the low frequency electromagnetic (LFE) filed can make the melt temperature uniform, promote the evacuation of superheat, make the temperature in the liquid pool lower than the liquidus temperature of 6063 aluminum alloy, increase the number of floating nuclei, make the ingot with fine and homogeneous macrostructure, though there is no addition of any grain refiners.

Effects of Low Frequency Electromagnetic Field on Segregation Layer during Hot-Top Casting of Aluminium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3795-3798
Author(s):  
Xiang Jie Wang ◽  
Jian Zhong Cui ◽  
Hai Tao Zhang ◽  
Hui Xue Jiang ◽  
Gao Song Wang
Keyword(s):  
Electromagnetic Field ◽  
Aluminium Alloy ◽  
Surface Segregation ◽  
Low Frequency ◽  
Casting Process ◽  
Direct Chill ◽  
Direct Chill Casting ◽  
Chill Casting ◽  
Direct Chill Casting Process

Surface segregation layer are frequently encountered during aluminium alloy direct chill casting process, and the removal of the surface segregation layer before further processing of the ingot decreases the ingot yield. In this work, the low frequency electromagnetic field was applied to study the effects of low frequency electromagnetic field on segregation layer during the direct chill casting process. The results show that under the effect of the low frequency electromagnetic field, the surface quality of ingot is improved, the structure of the ingot is refined, and the thickness of segregation layer is decreased.

Combined Effect of Electromagnetic Field and Grain Refiner on Microstructure of Φ310 Mm 7050 Aluminium Alloy Ingot

2011 ◽  
Vol 399-401 ◽  
pp. 1708-1711 ◽  
Author(s):  
Yu Bo Zuo ◽  
Zhi Hao Zhao ◽  
Hai Tao Zhang ◽  
Ke Qin ◽  
Jian Zhong Cui
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Grain Refinement ◽  
Large Scale ◽  
Low Frequency ◽  
Combined Effect ◽  
Grain Refiner ◽  
Alloy Ingot ◽  
7050 Aluminum Alloy

Grain refinement is quite important for producing 7050 alloy ingot especially in large scale. Low frequency electromagnetic casting (LFEC) process was used to make 7050 aluminum alloy Φ310 ingots and study the effect of electromagnetic field and grain refiner on the microstructure of 7050 alloy ingots. The results showed that both grain refiner and low frequency electromagnetic field can result in some grain refinement of 7050 alloy. However, the low frequency electromagnetic field shows more remarkable grain refinement. For the grain refined alloy by grain refiner, further significant grain refinement can be achieved with the application of low frequency electromagnetic field. The finest microstructure was achieved by combining the applications of both grain refiner and electromagnetic field.

Effects of Low Frequency Electromagnetic Field on Hot Tear during Hot-Top Casting Process

2010 ◽  
Vol 97-101 ◽  
pp. 1012-1015
Author(s):  
Xiang Jie Wang ◽  
Jian Zhong Cui ◽  
Qing Feng Zhu ◽  
Zhi Hao Zhao
Keyword(s):  
Electromagnetic Field ◽  
Flow Direction ◽  
Low Frequency ◽  
Casting Process ◽  
Hot Top ◽  
Aluminium Casting

Hot tear is one of the main defects during the aluminium casting process, and it usually occurs during solidification. In this work, the low frequency electromagnetic field was applied to study the effects of low frequency electromagnetic field on hot tear during the conventional hot-top casting process. The results show that under the effect of the low frequency electromagnetic field, the structure of the ingot is refined, the flow direction is changed, and the depth of the sump becomes shallow. All these factors can decrease the hot tear susceptibility.

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