Experimental investigation of heat transport and solidification during low frequency electromagnetic hot-top casting of 6063 aluminum alloy

Wang, Xiangjie; Zhang, Haitao; Zuo, Yubo; Zhao, Zhihao; Zhu, Qingfeng; Chen, Jianzhong

doi:10.1016/j.msea.2008.07.064

Cited by 30 publications

(16 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, during LFEC casting of Al-Zn-Mg-Cu alloy, the temperature field in the entire melt is quite uniform, and the temperature is 3-6°C below the liquidus, which cannot be achieved during the conventional DC casting process. This phenomenon was also confirmed in other aluminium alloys [30]. Therefore, the remelting of the formed nuclei was significantly reduced, and most of the nuclei can survive and act as effective nucleation agent, resulting in remarkable increase of effective nuclei.…”

Section: Heterogeneous Nucleation Under Forced Convectionsupporting

confidence: 64%

“…It has been demonstrated by both experimental [17,19,25,26] and simulation studies [27,28] that the LFEC process can form a very uniform temperature field in the sump and significantly refine the microstructures of Al-Zn-Mg-Cu alloys, which is favourable for the elimination of hot tearings. The grain refinement by LFEC process in some other aluminium alloys was also studied and confirmed [29,30].…”

Section: Introductionmentioning

confidence: 73%

See 1 more Smart Citation

Mechanism of grain refinement of an Al–Zn–Mg–Cu alloy prepared by low-frequency electromagnetic casting

et al. 2012

Self Cite

View full text Add to dashboard Cite

Low-frequency electromagnetic casting (LFEC) process had been developed and is being used for the past several years with the application of an induction coil placed outside the conventional direct chill (DC) casting mould. It has been demonstrated that the LFEC process has a significant grain refining effect on aluminium alloys. In the present study, temperature measurement and direct quenching from liquid and/or semi-solid were carried out to study the temperature field during casting process and to understand the mechanism of the grain-refining effect of the LFEC process. The experimental results showed that in contrast to the conventional DC casting process, the liquid melt from the launder, during the LFEC process, is cooled with very high cooling rate directly to 3-6°C below the liquidus, and the temperature field of the entire melt in the mould, and the hot top is quite uniform, which results in the enhanced heterogeneous nucleation and improved survival rate of the nuclei. This is believed to be the main reason why the LFEC process can significantly refine the grain size of aluminium alloys.

show abstract

Section: Heterogeneous Nucleation Under Forced Convectionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 73%

Mechanism of grain refinement of an Al–Zn–Mg–Cu alloy prepared by low-frequency electromagnetic casting

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…With the development of this process, it continues to gain popularity in the preparation of aluminum alloys. The numerous advantages of this process, which include refined micro-structures [10,11], improved surface quality of ingots, enhanced solid solubility of alloying elements within grain interiors [12], and improved macro-segregation and eliminating cracks [13], could improve the metallurgical quality of Al-Li alloys effectively.…”

Section: Introductionmentioning

confidence: 99%

Micro-Structure and Mechanical Properties of 2A97 Al-Li Alloy Cast by Low-Frequency Electromagnetic Casting

Wang

Chen

2019

Metals

Self Cite

View full text Add to dashboard Cite

In this paper, the micro-structure and solid solubility of 2A97 aluminum-lithium alloy ingots prepared by conventional direct chill (DC) casting and low frequency electromagnetic casting (LFEC) as well as the density of precipitates and tensile properties of 2A97 alloy after T6 treatment were investigated. The results show that the low-frequency electromagnetic field during casting had a remarkable effect on the refinement of micro-structure and solid solubility of alloying elements within the grains, which is very helpful to obtain a large number of fine, uniformly-distributed T1 phases. The mechanical properties of 2A97 alloy prepared by low frequency electromagnetic casting after T6 treatment were improved by obtaining a larger number T1 phases.

show abstract

“…These problems are exacerbated when casting aluminum alloy ingots with high alloying elements. In order to solve these problems, some methods have been developed in re-cent decades, including hot top casting 8) , ultrasonic casting 9) and electromagnetic casting 10) . Although these technologies have improved the quality of ingots, but the severe macrosegregation of alloying elements is still a key issue deteriorating ingot metallurgical quality.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Validations of Planar Solidification Process for Large Ingot by Using Moving Dense Sprues

Shao¹,

Zhang²,

Qin³

et al. 2017

Mater. Trans.

View full text Add to dashboard Cite

A mathematical model based on commercial nite volume package FLUENT has been developed to describe the melt ow and heat transfer during planar solidi cation casting process of 7050 alloy ingot with cross-section size of 600 × 600 mm. The effects of two xed sprues and two movable sprues served as the feeding system on the temperature eld and velocity eld of planar solidi cation were investigated. Moreover, the model has been veri ed by the temperature measurements obtained from experiments. The numerical results reveal that the effect of feeding system on melt temperature eld is dominating during planar solidi cation casting process and the movable sprues are signi cantly superior to the xed sprues. The characteristics of planar solidi cation front and uniform temperature eld are achieved by movable dense sprues. According to the numerical results, an ingot without V-shaped shrinkage and crack on the surface, and with uniform microstructure and small difference in composition was casted successfully. [Fig. 1 Schematic diagram of DC casting (a) and planar solidi cation casting (b).

show abstract

Experimental investigation of heat transport and solidification during low frequency electromagnetic hot-top casting of 6063 aluminum alloy

Cited by 30 publications

References 10 publications

Mechanism of grain refinement of an Al–Zn–Mg–Cu alloy prepared by low-frequency electromagnetic casting

Mechanism of grain refinement of an Al–Zn–Mg–Cu alloy prepared by low-frequency electromagnetic casting

Micro-Structure and Mechanical Properties of 2A97 Al-Li Alloy Cast by Low-Frequency Electromagnetic Casting

Numerical Simulation and Experimental Validations of Planar Solidification Process for Large Ingot by Using Moving Dense Sprues

Contact Info

Product

Resources

About