scholarly journals Numerical Simulation of Heat Transfer during Solidification of Al–Cu Alloy Ingots Cast in a Cylindrical Mold for Different Conditions

2016 ◽  
Vol 13 (1) ◽  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Mold Wall ◽  
Solidification Process ◽  
Mold Temperature ◽  
Outer Radius ◽  
Cu Alloy ◽  
First Case ◽  
Cylindrical Mold ◽  
Alloy Cast

In this paper, two dimensional numerical simulation of heat transfer during solidification of Al- 4.5 wt. % Cu alloy cast in a cylindrical mold was carried out to specify the optimum solidification conditions. The mold has the dimensions of 150 mm height, 38 mm outer radius, and 8 mm thickness. Four cases were studied for the solidification process; first case is the solidification in the mold without applying any thermal effects at four different mold temperatures of 25, 50, 100 and 200 Ԩ respectively. The second case is insulating the cast from the top. The third case is insulating the upper portion of the mold wall. The last case is adding heat to the upper portion of the mold wall for specific time. For the last three cases, the mold temperature is set to 25Ԩ. The results have shown that the increase in mold temperature only increases the solidification time and it does not significantly affect the temperature distribution and the final cast shape. Insulating the top of the mold made the last solidification region to be at the top of the cast, which leads to get ingot free from the secondary cavity. Insulating a portion of the upper wall of the mold made the cast surface to be more homogeneous with smallest secondary cavity. Heat addition to a portion of the upper wall of the mold leads to obtain a cast with approximately flat surface that is free from secondary cavity in addition to the primary cavity.

Numerical Simulation of Infiltration of Carbon Fiber Preform in MMC Casting With Thermal Management

2003 ◽  
Author(s):  
E. K. Lee ◽  
R. S. Amano ◽  
P. K. Rohatgi
Keyword(s):  
Numerical Simulation ◽  
Thermal Management ◽  
Heat Sink ◽  
Volume Fraction ◽  
Solidification Process ◽  
Mold Temperature ◽  
Processing Parameters ◽  
Companion Paper ◽  
Heat Extraction ◽  
Squeeze Infiltration

In the casting of metal matrix composite, different processing parameters need to be controlled in order to promote the formation of primary alpha phase around the reinforcement. It has been shown [1–3] that when the reinforcement is allowed to be extended out of the cast mold and cooled by a heat sink, the microstructure of the composite can be improved due to faster heat extraction through the reinforcement. Thermal management of the reinforcement can eliminate a large portion of the eutectic phase during solidification, leading to an altered microstructure at the interface between the matrix and the reinforcement with the possibility of improved material properties. A companion paper [4] shows a comparison of the numerical simulation result of the casting of MMC by squeeze infiltration technique to the experimental work. The authors assumed that the solidification process started after the liquid metal has completely infiltrated the reinforcement. The simulation result gives a reasonable prediction to the experimentally measured cooling temperature profile. In this work, the effects of other processing parameters are analyzed to study the impregnation depth during squeeze infiltration. These processing parameters include the thermal conductivity of fibers, the initial (or preheat) mold temperature, the volume fraction of fibers, and the heat sink temperature. The study is based on the finite volume method for enthalpy formulated heat equation.

Numerical Simulation on Rapidly Solidified Melt Spinning CuFe10 Alloys

2011 ◽  
Vol 228-229 ◽  
pp. 416-421
Author(s):  
Zhi Ming Zhou ◽  
Wei Jiu Huang ◽  
M. Deng ◽  
Min Min Cao ◽  
Li Wen Tang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Vacuum Chamber ◽  
Solidification Process ◽  
One Dimensional ◽  
Heat System ◽  
Heat Transfer Theory ◽  
Rapidly Solidified

The numerical simulation model of single roller rapid solidification melt-spinning CuFe10 alloys was built in this paper. The vacuum chamber, cooling roller and sample were taken into account as a holistic heat system. Based on the heat transfer theory and liquid solidification theory, the heat transfer during the rapids solidification process of CuFe10 ribbons prepared by melt spinning can be approximately modeled by one-dimensional heat conduction equation, so that the temperature distribution and the cooling rate of the ribbon can be determined by the integration of this equation. The simulative results are coincident very well with the microstructure of rapid solidification melt spinnng CuFe10 alloys at three different wheel speeds 4, 12 and 36 m/s.

Numerical Simulation on Splat-Quenched CuCr25 Alloys

2011 ◽  
Vol 189-193 ◽  
pp. 3949-3953
Author(s):  
Zhi Ming Zhou ◽  
Bin Bin Lei ◽  
Li Wen Tang ◽  
Tao Zhou ◽  
Yang Hu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Rapid Solidification ◽  
Heat Conduction Equation ◽  
Vacuum Chamber ◽  
Solidification Process ◽  
One Dimensional ◽  
Heat System ◽  
Splat Quenching ◽  
Heat Transfer Theory

The numerical simulation model of rapid solidification splat-quenching CuCr25 alloys was built in this paper. The vacuum chamber, cooling cooper plate and sample were taken into account as a holistic heat system. Based on the heat transfer theory and liquid solidification theory, the heat transfer during the rapids solidification process of CuCr25 flakes prepared by splat-quenching can be approximately modeled by one-dimensional heat conduction equation, so that the temperature distribution and the cooling rate of the flake can be determined by the integration of this equation. The simulative results are coincident very well with the experimental results for the microstructure of rapid solidification splat-quenched CuCr25 alloys.

Sign in / Sign up

Export Citation Format

Share Document