On the Microstructure and Impact Properties of A356 Die Castings Fabricated with Slow Injection Method
(0) Microstructure and impact properties of slow injection A356 die castings have been investigated. The microstructure in the casting different regions were analyzed and compared. As for the as-cast castings, eutectic Si particles are characterized as fibrous or long acicular shape as well as inhomogenously network distribution, and impact absorbed energy varies from 1. 17 to 2. 35J. After T6 heat treatment, eutectic Si particles were changed to small granular or short bacilliform, and Si particle aspect ratio (A. R.) and area fraction decreased evidently. The impact absorbed energy of the T6-treated castings is between 1. 45 and 3. 80J. Furthermore, fracture mechanism of different regions in castings are analyzed and discussed. Through mathematical regression analysis, it is indicated that the impact property is dependent on both Si particle A. R. and secondary dendrite arm spacing (SDAS).
die casting slow injection microstructure impact property A356
Zhao Haidong Li Yuanyuan Chen Weiping Bai Yanfei
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
224-228
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）