Zheng Z.-K.,University of Science and Technology Beijing |
Mao W.-M.,University of Science and Technology Beijing |
Yan B.-Q.,Cixi Huili Machinery and Electrical Co. |
Yue R.,University of Science and Technology Beijing |
Liu Z.-Y.,Tsinghua University
China Foundry | Year: 2015
In this paper, the serpentine channel pouring process for preparing a semi-solid A390 alloy slurry and refining the primary Si grains of the A390 alloy, was used. The effects of the pouring temperature, the cooling water flow and the number of the curves on the size of the primary Si grains in the semi-solid A390 alloy slurry were investigated. The results show that the pouring temperature, the cooling water flow and the number of the curves have a major effect on the size and the distribution of primary Si grains. Under the experimental condition of the four-curve copper channel whose cooling water flow was 500 L·h-1 and the pouring temperature was 690 ºC, the primary Si grains of the semi-solid A390 alloy slurry were refined to the greatest extent and the lath-like grains were changed into granular ones. Additionally, the equivalent grain diameter and the average shape factor of the primary Si grains of the satisfactory semi-solid A390 alloy slurry are 18.6 μm and 0.8, respectively. Further, the refinement mechanism of the primary Si grains through the serpentine channel pouring process was analyzed and discussed. In summary, the primary Si nuclei could be easily precipitated due to the chilling effect of the channel inner wall, thus the primary Si grains were greatly refined. Meanwhile, the subsequent alloy melt fluid also promoted the separation of primary Si grains from the inner wall, further refining the primary Si grains. © 2015, Foundry Journal Agency. All rights reserved.
Zhang Z.,Cixi Huili Machinery and Electrical Co. |
Chen M.,HA Foundry Material Co.
Zhuzao/Foundry | Year: 2010
The application of shielding coating to the steel casting process was presented, and the castings prepared by shielding coating and other coatings were compared. The results show that the shielding coating can prevent not only the burning-on defect, but also the sulfurizing and carbureting effectively.
Chen Z.-Z.,Cixi Huili Machinery and Electrical Co. |
Ren W.-G.,Cixi Huili Machinery and Electrical Co.
Zhuzao/Foundry | Year: 2014
The semi-solid A356 aluminum alloy slurry was prepared by using water-cooled turbulent channel, the influence of the turbulent blade on radial temperature of the alloy melt in the channel and microstructure of semi-solid slurry were investigated, and the globular primary α(Al) grain formation mechanism was analyzed. The results show that when alloy melt flow through each of blades, the radial temperature difference gradually decreases. When the pouring temperature is at 650°C and the alloy melt flow through the last blade, the radial temperature difference reduces to 0-2°C. The turbulent blades increase surface area of the alloy melt contacting wall and promote primary α(Al) nucleus formation, thereby primary α(Al) grain morphology is improved.
Zhang Z.,Cixi Huili Machinery and Electrical Co.
Zhuzao/Foundry | Year: 2011
The casting structure of the cylinder for compressor was analyzed in this paper, and the casting process was designed. The defects such as burning-on and shrinkage porosity were eliminated through enhancing the procedure control during production. Finally the qualified castings were produced, which can provide the technical support and experience for production of similar cylinder castings.