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Niu J.,South China University of Technology | Li L.,South China University of Technology | Liu H.,South China University of Technology | Gao J.,South China University of Technology | Ren C.,Guangzhou Jinbang Nonferrous Alloy Co.
Materials Science Forum | Year: 2016

The inoculation and fading behavior of Sr-modified aluminum alloy A356. 2 were studied for air bag bracket produced by squeeze casting. The effects of Sr, P, B contents and casting temperature on the microstructure and eutectic silicon morphology in different periods of inoculation were investigated by SEM and direct-reading Spectrometer. The influence of inoculation fading rate and addition of Sr on the casting mechanical properties and hydrogen absorption was studied. The experimental results showed that the inoculation process was completed in 1 h, and the eutectic silicon morphology can be maintained in almost subsequent 40 h after the addition of Sr. The fading rate decreased appreciably with the increase of casing temperature, P and B contents. The deleterious effect of the inoculation fading of Sr on the casting mechanical property can be compensated by the squeeze casting. © 2016 Trans Tech Publications, Switzerland. Source


Zhang X.-Y.,Aerospace Research Institute of Materials And Processing Technology | Cao D.,Guangzhou Jinbang Nonferrous Alloy Co. | Lu F.,Aerospace Research Institute of Materials And Processing Technology | Liu J.-H.,Beihang University
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2016

The aging properties, absorption and mechanical properties of T700/5224 composites which were in hygrothermal environment and in 15# hydraulic oil, 4010# lubricating oil, RP-3 kerosene and AHC-1 cleaner were studied. The properties' changes and Tg of the T700/5224 composite were analyzed by infrared analysis (IR) and dynamic mechanical analysis (DMA). The results show that the absorption is 1.05% in environment of 80℃-85%RH, and 1.35% in environment of 80℃-100%RH. Shear strength is not changed obviously, but flexural strength decreases greatly. Open-hole tensile strength changes a lot, but on the whole, not decreases. Open-hole compression strength is always gradually decreasing. There is no evident impact on mechanical properties of composite by chemical solutions. The effect of AHC-1 cleaner on T700/5224 composite is bigger than the other three media, Tg declines 10℃ after soaking in AHC-1 cleaner for 45 days. © 2016, Beijing Institute of Aeronautical Materials (BIAM). All right reserved. Source


Wang G.,University of Science and Technology Beijing | Yang H.,University of Science and Technology Beijing | Chen X.,Guangzhou Jinbang Nonferrous Alloy Co. | Fan W.,Guangzhou Jinbang Nonferrous Alloy Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Squeeze casting process of the air conditioning compressor front cover was simulate by using ProCast software to predict entrapment-gas and shrinkage defects in the filling process with the pouring temperature of 660°C , the mold preheating temperature of 200°C and the pouring velocity of 150mm/s as well as the squeezing pressure of 70 MPa. Liquid height difference in filling process can be narrowed through decreasing filling velocity. Entrapment gas in the castings can be eliminated with filling velocity of 100 mm/s. With increasing in pressure and in die preheating temperature, shrinkage porosity is reduced. However, shrinkage porosity area occurs in the center after adjusting process parameters. Through imposing a secondary pressure on the central part, shrinkage porosity is eliminated. Source


Chen X.W.,Guangzhou Jinbang Nonferrous Alloy Co. | Xu D.Y.,Guangzhou Jinbang Nonferrous Alloy Co.
Advanced Materials Research | Year: 2013

Using the ProCast casting simulation software to make squeeze casting process simulation and analysis of the solidification process of the air conditioning compressor front cover and predict the location of gas volumes and shrinkage defects in the filling process. When adjusted the process parameters, volumes gas defects were eliminated, but there was still shrinkage occurs in the center. When imposed a secondary pressure on the central part, shrinkage was eliminated. © (2013) Trans Tech Publications, Switzerland. Source


Wang H.,China Institute of Technology | Wang S.,China Institute of Technology | Zheng K.,China Institute of Technology | Wang J.,Guangzhou Jinbang Nonferrous Alloy Co. | Chen X.,Guangzhou Jinbang Nonferrous Alloy Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

The SiCp/6061 aluminum matrix composites with SiC particles in range of 20 to 50 μm were prepared by semi-solid stirring casting. Effects of SiC particle size on the microstructure and properties of SiCp/6061 aluminum matrix composites were investigated. The results indicate that the dispersion uniformity of SiC particles in aluminum matrix composite is improved with increasing in SiC particle size, however, the tensile properties and elongation are decreased. Fracture mechanism of the composites is characterized by co-action of interfacial de-bonding and particle cracking. The particle crack plays a dominant role in crack mechanism with SiC particle size increase. With the increase of SiC particle size, wear resistance of SiCp/6061 aluminum matrix composites is increased. The friction and wear mechanism can be described by adhesive wear and abrasive particles wear, and the abrasive wear will play the dominant role with increasing in SiC particle size. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source

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