Optimization of remelting process of piston aluminum alloy through TIG

Wednesday, May 13, 2015
Exhibit Halls A&B (Long Beach Convention and Entertainment Center)
Dr. Peihu Gao , Xi'an Technological University, Xi'an, China
Prof. Jianping Li , Xi'an Technological University, Xi'an, China
Mr. Yongxin Wu , PLA Representative Office in Factory No.616, Datong, China
Mr. Jilin liu , PLA Representative Office in Factory No.616, Datong, China
Mrs. Zhiling Yang , Foundry of North General Power Group Co., Ltd, Datong, China
Mr. Hongyan Li , Foundry of North General Power Group Co., Ltd, Datong, China
With the improvement of liter power density of diesel engine, the higher performance requirements for piston material in combustion chamber are brought out. In order to improve the properties of piston aluminum alloy, remelting through TIG was introduced to reduce surface grain size in this work. Effects of remelting process on the microstructure and mechanical properties of remelted piston aluminum alloy were investigated. 
  The optimized TIG remelting parameters were the current of 170A, the traveling speed of 9 mm/s, the electrode distance of 5mm, the protective gas argon flow of 12 ml/min, the remelted depth of 0.65 mm and the remelted width of 4.92 mm. 
Primary silicon grain size in piston aluminum alloy was refined from 24um to  3um through remelting, which was about one eighth of the original one. The average micro-hardness of remelted zone was 197 Hv, which was 43% higher than the matrix zone 138 Hv.
See more of: Poster Session
See more of: Posters