Mold-filling characteristics and solidification behavior of magnesium alloy in vacuum suction casting process

2009 ◽  
Vol 44 (20) ◽  
pp. 5644-5653 ◽  
Author(s):  
Haitao Teng ◽  
Tingju Li ◽  
Xiaoli Zhang ◽  
Fudong Bai ◽  
Kai Qi
Keyword(s):  
Magnesium Alloy ◽  
Casting Process ◽  
Mold Filling ◽  
Solidification Behavior ◽  
Vacuum Suction ◽  
Suction Casting ◽  
Filling Characteristics

Investigation on Sub-Rapid Solidification Behavior of Semi-Solid Magnesium Alloy Metal

2011 ◽  
Vol 320 ◽  
pp. 156-162
Author(s):  
Hai Tao Teng ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Ting Ju Li
Keyword(s):  
Magnesium Alloy ◽  
Rapid Solidification ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Solid Particles ◽  
Solidification Behavior ◽  
Vacuum Suction ◽  
Semi Solid ◽  
Rapidly Solidified ◽  
Alloy Metal

In order to investigate sub-rapid solidification behavior of semi-solid magnesium alloy metal, a novel semi-solid processing technique, called new vacuum suction casting (NVSC), is used to manufacture thin castings of AZ91D Mg-alloy directly from a liquid metal. The resulting microstructures of castings are characterized in detail and linked to the solidification behavior. In the microstructure of the sub-rapidly solidified SSM sheet, the “preexisting” primary solid particles, with the morphology of near-globules or rosettes, disperse in the homogeneous matrix consisting of fine near-equiaxed secondary α-Mg grains and fine precipitates of β-Mg17Al12 intermetallics. Owing to rapid solidification rate, the volume fraction of the β phase in the sub-rapidly solidified SSM sheets is much lower than that in the as-cast ingot. In addition, the content of alloying elements of Al and Zn was higher in the grain boundaries and the eutectic structure than that in the primary solid particles and in the second α-grains.

Numerical Simulation of Mold Filling and Solidification Behavior in Permanente Casting Process

2013 ◽  
Vol 313-314 ◽  
pp. 179-183
Author(s):  
Qing Ming Chang ◽  
Yin Kai Yang ◽  
Jing Yuan ◽  
Xia Chen
Keyword(s):  
Casting Process ◽  
Mold Filling ◽  
Permanent Mold ◽  
Gating System ◽  
Solidification Behavior ◽  
Mold Casting ◽  
Simulation Results ◽  
Permanent Mold Castings ◽  
Filling And Solidification

Melt flow and casting solidification are essential parts of the permanent mold casting process and affect significantly the quality of castings．For this reason, accurate prediction of mold filling pattern and temperature field in permanent mold castings plays on an important role in producing sound castings. In this paper, the model filling and solidification of a box casting produced from an aluminum alloy is studied. Different casting processes are employed, simulated and optimized to obtain sound castings. Simulation results reveal that with appropriate gating system, pouring rate, cooling line, a smooth mold filling, reduced shrinkages and other defects are available and desired sound castings can be produced.

Functions of Step Gating System in the Lost Foam Casting Process

2012 ◽  
Vol 591-593 ◽  
pp. 940-944 ◽  
Author(s):  
Hong Zhou ◽  
Li Heng Luo
Keyword(s):  
Mass Flux ◽  
Flux Ratio ◽  
Casting Process ◽  
Mold Filling ◽  
Lost Foam Casting ◽  
Gating System ◽  
Bottom Side ◽  
Total Mass Flux ◽  
Filling Characteristics ◽  
Lost Foam

In order to explore whether the step gating system played a role in lost foam casting (LFC) process, this paper simulated the mold filling process of a step gating system with an auxiliary sprue and three side ingates by using the gravity LFC model of the code FLOW-3D, and analyzed its mold filling characteristics in LFC. It is found the mass flux ratio through the bottom-side ingate exceed 82% the total mass flux, much more than through the others. And it is also found the metal temperature of the middle region in the height direction is lower than the upper region or bottom region. The results show that the step gating system is not able to achieve its main roles in LFC. Our results can be used to design gating system in LFC.

scholarly journals Influence of cerium content on the microstructure and thermal expansion properties of suction cast Al-Cu-Fe alloys

2021 ◽  
Vol 8 (11) ◽  
Author(s):  
Juan Wang ◽  
Zhong Yang ◽  
Zhijun Ma ◽  
Yaping Bai ◽  
Hongbo Duan ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Rare Earth ◽  
Coefficient Of Thermal Expansion ◽  
Casting Process ◽  
Aerospace Materials ◽  
Vacuum Suction ◽  
Suction Casting ◽  
Cerium Content ◽  
Fe Alloys ◽  
Addition Amount

Low-expansion alloys are of great importance and can be used for the development of new aerospace materials. Herein, we report diverse rare earth quasicrystal alloys fabricated by the vacuum suction casting process. The effects of the addition of cerium (Ce) on the microstructure, thermal expansion properties and microhardness of the Al-Cu-Fe alloy were systematically investigated. This study discovered the tiny Al-Cu-Fe-Ce microstructure. A uniform distribution could be achieved after Ce addition amount is elevated. At the Ce addition amount of 1 at%, the lowest alloy thermal expansion coefficient was obtained. The alloy exhibited the maximum microhardness under these conditions. The microhardness of alloys containing 1 at% of Ce was approximately 2.4 times higher than the microhardness exhibited by alloys devoid of Ce additives. The coefficient of thermal expansion decreases by approximately 20%. The use of the suction casting process and the addition of an appropriate amount of Ce can potentially help design and develop Al-Cu-Fe-Ce alloys.

Study on Pressure Variations in the Mold of Magnesium Alloy Die Castings

2007 ◽  
Vol 353-358 ◽  
pp. 1614-1616
Author(s):  
Yan Gai Liu ◽  
Zhao Hui Huang ◽  
Hao Ding ◽  
Ming Hao Fang ◽  
Shou Mei Xiong
Keyword(s):  
Magnesium Alloy ◽  
Real Time ◽  
Time Pressure ◽  
Die Casting ◽  
Solidification Process ◽  
Casting Process ◽  
Mold Filling ◽  
Die Casting Process ◽  
Die Castings ◽  
Filling And Solidification

High pressure die casting is the most common method in making magnesium alloys for both auto parts and 3C products. Pressure variations in the mold during mold filling and solidification process have direct influences on the quality and properties of die castings. In this paper, a cylinder head cover was produced to experimentally study pressure variations in the mold during magnesium alloy die-casting process in real time for the first time. Pressure varies at different positions in the mold during die casting process. This study indicates that mold filling and solidification process of magnesium alloy die castings can be described by pressure curves obtained by pressure measurement at different test positions in the cavity in real time.

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