China Foundry
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Radiation heat transfer model for complex superalloy turbine blade in directional solidification process based on finite element method
China Foundry - Tập 13 - Trang 123-132 - 2016
For the sake of a more accurate shell boundary and calculation of radiation heat transfer in the Directional Solidification (DS) process, a radiation heat transfer model based on the Finite Element Method (FEM) is developed in this study. Key technologies, such as distinguishing boundaries automatically, local matrix and lumped heat capacity matrix, are also stated. In order to analyze the effect ......
Effect of solution treatment on microstructure and mechanical properties of as-cast Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd alloy
China Foundry - Tập 19 - Trang 238-244 - 2022
Effect of solution treatment on microstructure and mechanical properties of Al-12Si-4Cu-2Ni-0.8Mg-0.2Gd alloy was investigated. Results show the Si particles become stable and more intermetallic compounds dissolve in the matrix after solution treatment at 500 °C for 2 h followed by 540 °C for 3 h (T4). The skeleton-like Al3CuNi develops into two parts in the T4 alloy: one is Al3CuNi which has the ......
Effect of Fe2B boride orientation on abrasion wear resistance of Fe-B cast alloy
China Foundry - Tập 14 - Trang 272-278 - 2018
The microstructures and abrasion wear resistance of directional solidification Fe-B alloy have been investigated using optical microscopy, X-ray diffraction, scanning electron microscopy and laser scanning microscopy. The results show that the microstructure of as-cast Fe-B alloy consists of ferrite, pearlite and eutectic boride. After heat treatment, the microstructure is composed of boride and m......
Effect of mould baffle technology on stray grain formation in single crystal blades by integral fabrication based on 3D printing
China Foundry - Tập 18 - Trang 433-441 - 2021
Stray grains, the most serious casting defect, mainly occur in the platform because of the abrupt transition of the cross-section in the directional solidification of superalloy single-crystal blades. A new mould baffle technology based on 3D printing and gelcasting is proposed herein to reduce the formation of stray grains in the platform. The influence of the proposed mould baffle technology on ......
Influence of pouring methods on filling process, microstructure and mechanical properties of AZ91 Mg alloy pipe by horizontal centrifugal casting
China Foundry - Tập 15 - Trang 196-202 - 2018
Pouring position as the input heat source has great influence on the temperature field evolution. In this study, the Flow3D simulation software was applied to investigate the influence of pouring methods (with fixed or moving pouring channel) on AZ91 Mg alloy horizontal centrifugal casting (HCC) process. The simulation results show that the moving pouring channel method can effectively increase th......
Effect of thermal convection on columnar-to-equiaxed transition during solidification of Al-Cu alloy
China Foundry - Tập 15 - Trang 358-362 - 2018
To investigate the effect of three-dimension (3D) thermal convection on columnar-to-equiaxed transition (CET), the CET transition during the solidification of an Al-Cu alloy was simulated by 3D cellular automaton model coupled with the finite element method (CAFE). The thermal convection in the liquid phase was considered. The results show that the thermal convection in the liquid phase promotes t......
Effect of wide-spectrum pulsed magnetic field on grain refinement of pure aluminium
China Foundry - Tập 20 - Trang 40-48 - 2023
A wide-spectrum pulsed magnetic field (WSPMF) was obtained by adjusting the number of current pulses and the pulse interval between adjacent pulses. The effect of WSPMF on the grain refinement of pure aluminium was studied. The distribution of electromagnetic force and flow field in the melt under the WSPMF was simulated to reveal the grain refining mechanism. Results show that the grain refinemen......
Preparation of submicrocrystal Al-Ti-B master alloy and its influence on microstructure and properties of AZ91D
China Foundry - Tập 14 - Trang 513-518 - 2018
To improve the mechanical properties of AZ91D magnesium alloy, the submicrocrystal Al-Ti-B master alloy was prepared with copper mold inject casting method, and the influence of submicrocrystal Al-Ti-B master alloy on the microstructure and mechanical properties of AZ91D was investigated. Results show that, the distribution of TiB2 phase in submicrocrystal Al-Ti-B alloy is even and disperse, and t......
Segregation in squeeze casting 6061 aluminum alloy wheel spokes and its formation mechanism
China Foundry - Tập 18 Số 1 - Trang 45-51 - 2021
Filling mode and regularity of vertical centrifugal casting process of titanium alloy in thin-walled cylinder cavity
China Foundry - Tập 16 - Trang 105-109 - 2019
The mold filling process of titanium alloy in a thin-walled cylinder cavity under vertical centrifugal casting process was studied by means of the hydraulic simulation experiments. Results show that the filling mode of the melt in the cylinder cavity varies with casting wall-thickness. When the casting wall-thickness is less than or equal to the thickness of the first layer during the filling proc......
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