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| 1 | Study on Numerical Simulation of Mold Filling and Heat Transfer in Die Casting Process显示文摘A 3-D mathematical model considering turbulence phenomena has been established based-on a computational fluid dynamics technique, so called 3-D SOLA-VOF (Solution Algorithm-Volume of Fluid), to simulate the fluid flow of mold filling process of die casting. In addition, the math- ematical model for simulating the heat transfer in die casting process has also been established. The computation program has been developed by the authors with the finite difference method (FDM) recently. As verification. the mold filling process of a S-shaped die casting has been simulated and the simulation results coincide with that of the benchmark test. Finally, as a practical application, the gating design of a motorcycle component was modified by the mold filling simulation and the dies design of another motorcycle component was optimized by the heat transfer simulation. All the optimized designs were verified by the production practice. | Liangrong JIA, Shoumei XIONG and Baicheng LIU (Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China) | 2000 | Journal of Materials Science & Technology2000，16，3： | 17 |
| 2 | STUDY ON NUMERICAL SIMULATION OF MOLD-FILLING AND SOLIDIFICATION PROCESSES OF SHAPED CASTING显示文摘0INTRODUCTIONInrecentyears,considerabledevelopmentshavetakenplaceinthefieldofCADandsolidificationmodelingofcastingprocess[1~... | Shoumei, Xiong Baicheng, Liu | 1999 | Chinese Journal of Mechanical Engineering1999，12，1： | 16 |
| 3 | Determination of Interfacial Heat Transfer Behavior at the Metal/Shot Sleeve of High Pressure Die Casting Process of AZ91D Alloy显示文摘The interfacial heat transfer behavior at the metal/shot sleeve interface in the high pressure die casting(HPDC) process of AZ91 D alloy is carefully investigated.Based on the temperature measurements along the shot sleeve,inverse method has been developed to determine the interfacial heat transfer coefficient in the shot sleeve.Under static condition,Interfacial heat transfer coefficient(IHTC) peak values are 11.9,7.3,8.33 k W m^(-2)K^(-1)at pouring zone(S2),middle zone(S5),and end zone(S10),respectively.During the casting process,the IHTC curve displays a second peak of 6.1 k W m^(-2)K^(-1)at middle zone during the casting process at a slow speed of 0.3 m s^(-1).Subsequently,when the high speed started,the IHTC curve reached a second peak of 12.9 k W m^(-2)K^(-1)at end zone.Furthermore,under different slow casting speeds,both the calculated initial temperature(TIDS) and the maximum temperature(Tsimax) of shot sleeve surface first decrease from 0.1 m s^(-1)to 0.3 m s^(-1),but increase again from 0.3 m s^(-1)to 0.6 m s^(-1).This result agrees with the experimental results obtained in a series of 'plate-shape' casting experiments under different slow speeds,which reveals that the amount of ESCs decreases to the minimum values at 0.3 m s^(-1)and increase again with the increasing casting slow speed. | Wenbo Yu Yongyou Cao Xiaobo Li Zhipeng Guo Shoumei Xiong | 2017 | Journal of Materials Science & Technology2017，33，1： | 7 |
| 4 | Microstructure Characteristics of the Eutectics of Die Cast AM60B Magnesium Alloy显示文摘Under the cold-chamber high pressure die casting (HPDC) process, samples were produced with AM60B magnesium alloy to investigate the microstructure characteristics of the eutectics, especially focusing on the constitution, morphology and distribution of the eutectics over cross section of the castings. Attentions were also paid to study the effect of heat treatment on the eutectics in the die castings. Based on experimental analysis using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), it was determined that fully divorced eutectics consisting of α-Mg and β-Mg17Al12 appeared at the grain boundary of the primary α-Mg in the as-cast microstructure. Islands and networks of β-Mg17Al12 phase were observed in the central region of the castings, while the β-Mg17Al12 phase revealed a more dispersed and granular morphology on the surface layer. The two phases ratio β/α in the central region of the castings was approximately 10%, which was higher than that on the surface layer. Besides, the defect bands contained a higher percentage of the eutectics than the adjacent regions. After aging treatment (T6), only α-Mg phase was detected by XRD in the AM60B magnesium alloy, though a small amount of precipitated β-Mg17Al12 phase was observed at the grain boundary. In contrast to the microstructure of die cast AZ91D magnesium alloy under the same T6 heat treatment, no discontinuous precipitation of the β-Mg17Al12 phase was observed in AM60B magnesium alloy die castings. | MengwuWu Shoumei Xiong | 2011 | Journal of Materials Science & Technology2011，27，12： | 6 |
| 5 | A three-dimensional cellular automaton model for simulation of dendritic growth of magnesium alloy显示文摘A numerical model based on the cellular automaton method for the three-dimensional simulation of dendritic growth of magnesium alloy was developed. The growth kinetics was calculated from the complete solution of the transport equations. By constructing a three-dimensional anisotropy model with the cubic CA cells, simulation of dendritic growth of magnesium alloy with six-fold symmetry in the basal plane was achieved. The model was applied to simulate the equiaxed dendritic growth and columnar dendritic growth under directional solidification, and its capability was addressed by comparing the simulated results to experimental results and those in the previously published works. Meanwhile, the three-dimensional simulated results were also compared with that of in two dimensions, offering a deep insight into the microstructure formation of magnesium alloy during solidification. | Mengwu WU Shoumei XIONG | 2012 | Acta Metallurgica Sinica(English Letters)2012，25，3： | 6 |
| 6 | Determination of interfacial heat transfer coefficient and its application in high pressure die casting process显示文摘In this paper,the research progress of the interfacial heat transfer in high pressure die casting(HPDC)is reviewed.Results including determination of the interfacial heat transfer coefficient(IHTC),influence of casting thickness,process parameters and casting alloys on the IHTC are summarized and discussed.A thermal boundary condition model was developed based on the two correlations:(a)IHTC and casting solid fraction and(b)IHTC peak value and initial die surface temperature.The boundary model was then applied during the determination of the temperature field in HPDC and excellent agreement was found. | Cao Yongyou Guo Zhipeng Xiong Shoumei | 2014 | China Foundry2014，11，4： | 6 |
| 7 | The effect of slow shot speed and casting pressure on the 3D microstructure of high pressure die casting AE44 magnesium alloy显示文摘3D reconstruction and 2D observation were conducted to characterize the microstructure of the castings produced through high pressure die casting with different parameters.Our results indicate that shrinkage pores generally co-existed with externally solidified crystals(ESCs).In specimen produced without fast slow shot speed,big net-shrinkage pores accompanied with ESCs were found in the center of the specimen.When the casting pressurization was introduced,the shrinkage pores gathered to the specimen center and became much less due to the optimization of melt feeding.Much more porosity was found near the gate rather than in the middle of the rod bar,especially gas pores.Thefilling process simulation reveals that the middle position of the bars wasfirstlyfilled and followed by the near gate position accompanied with one intense turbulentflow. | Chaosheng Ma Wenbo YU Tongtong Zhang Zihua Zhang Yihu Ma Shoumei Xiong | 2023 | Journal of Magnesium and Alloys2023，11，2： | 2 |
| 8 | Numerical Simulation of Microporosity Evolution of Aluminum Alloy Castings显示文摘A mathematical model to calculate the size and distribution of microporosities was studied and coupled with a stochastic microstructure evolution model. The model incorporates various solidification phenomena such as grain structure evolution,solidification shrinkage, interdendritic fluid flow and formation and growth of pores during solidification processes. The nucleation and growth of grains were modeled with a cellular automaton method that utilizes the results from a macro scale modeling of the solidification process. Experiments were made to validate the proposed models. The calculated results of aluminum alloy castings agreed with the experimental measurements. | Shuyong DONG, Shoumei XIONG and Baicheng LIUDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China | 2004 | Journal of Materials Science & Technology2004，20，1： | 2 |
| 9 | On the deformation behavior of heterogeneous microstructure and its effect on the mechanical properties of die cast AZ91D magnesium alloy显示文摘Both a conventional flow distributer and an improved one with a flow buffer were applied respectively during the high pressure die casting(HPDC)process,and samples of AZ91D magnesium alloy with different microstructure mainly consisting ofα-Mg grains,β-phase and porosities were obtained.According to the grain orientation analysis,the predominant deformation behavior inα-Mg grains was dislocation slip,supplemented by deformation twinning.Dislocation slip was more difficult to occur in the samples with the improved flow distributer on account of the fact that the size ofα-Mg grains in the microstructure was finer and more uniform.During the in situ tensile deformation test,cracks were observed to initiate from gas-shrinkage pore and island-shrinkage,and two main crack propagation mechanisms,porosity growth and coalescence were found accordingly.When the crack was in contact with theβ-phase,it would pass through and fracture the networkβ-phase,whereas bypass the islandβ-phase by detaching it from the surroundingα-Mg grains.Mechanical property tests showed that the samples with relatively more homogeneous microstructure would perform higher mechanical properties,which was the combined effect of matrixα-Mg grains,β-phase,and porosities. | Mengwu Wu Yingying Hou Lin Hua Huijuan Ma Xiaobo Li Shoumei Xiong | 2022 | Journal of Magnesium and Alloys2022，10，7： | 1 |
| 10 | Numerical methods to improve the computational efficiency of thermal analysis for the die casting process 显示文摘 | Xiong Shoumei Lau F Lee W B | 2003 | Journal of Materials Processing Technology2003，139，13： | 1 |
| 11 | Study on the protecting effect of HFC134a on AZ91D magnesium alloy in a sealed melting furnace 显示文摘 | NIE Shuhong XIONG Shoumei | 2006 | Magnesium Technology2006，，： | 1 |
| 12 | Study on a CAD/CAE system of die-casting 显示文摘 | Zhang Weishan Xiong Shoumei Liu Baicheng | 1997 | Journal of materials processing technology1997，，63： | 1 |
| 13 | Protection behavior of SO2- containing cover gases to molten magnesium alloy显示文摘 | WANG XIANFEI XIONG SHOUMEI | 2011 | Trans Non- ferrous Met Soc China2011，21，4： | 1 |
| 14 | Protection behavior of flu- orine-containing cover gases on molten magnesium alloys 显示文摘 | XIONG SHOUMEI WANG XIANFEI | 2010 | Trans Nonferrous Met Soe China2010，20，7： | 1 |
| 15 | Chinese Journal of Mechanical Engineering (English Edition)显示文摘 | LIU Baicheng | 1999 | 12(1):4~ 101999，12，1： | 1 |
| 16 | ,Tsinghua Science and Technology显示文摘 | LIU Baicheng ZHU Riming | 1996 | 1( 2) : 176~ 1801996，1，2： | 1 |
| 17 | An efficient thermal analysis system for the die casting process显示文摘 | LauF Lee W B | 2002 | Journal of Materials Processing Technology2002，，128： | 1 |
| 18 | Tensile fracture of as-cast and hot rolled Mg-Zn-Y alloy with long-period stacking phase 显示文摘 | Wang Baishuo Xiong Shoumei Liu Yongbing | 2010 | Transactions of Nonferrous Metals Society of China2010，20，2： | 1 |
| 19 | A study on the numerical simulation of thermal stress during the solidification of shaped castings 显示文摘 | LIU Baicheng KANG Jinwu XIONG Shoumei | 2001 | Science and Technology of Advanced Materials2001，2，1： | 1 |
| 20 | Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg-3.0Nd-0.3Zn-0.6Zr alloy显示文摘To clarify the relationship between externally solidified crystals(ESCs)and other defects,e.g.,defect bands and pores,two dimensional(2D)and three dimensional(3D)characterization methods were adopted to analyze castings produced using a modified ingate system equipped with and without an ESC collector.The reduction of ESCs strongly reduced defect band width and shrinkage pore quantity.By reducing the quantity and size of ESCs,net-shrinkage pores were transformed into isolated island-shrinkage pores.We determined via statistical analysis that the mechanical properties of high pressure die castings were strongly related to the size and fraction of the ESCs rather than porosity volume.The reduction of ESCs also caused tensile transgranular fracture modes to transform into intergranular fracture modes.Additionally,casting pressurization strongly reduced pore morphology,volume,and size. | Tongtong Zhang Wenbo Yu Chaosheng Ma Yuqi Zhou Shoumei Xiong | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，7： | 0 |
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