Development of inclusions in 3104 alloy melt during heating and holding treatments  

作　　者：Xiao-xiong Luo Hai-tao Zhang Xing Han Shi-jie Guo Dan-dan Chen Jian-zhong Cui Hiromi Nagaumi 

机构地区：[1]Key Laboratory of Electromagnetic Processing of Materials, Northeastern University [2]Chinalco Rumin Co., Ltd. [3]Suzhou Research Institute for Nonferrous Metals [4]Chinalco Research Institute of Science and Technology

出　　处：《International Journal of Minerals,Metallurgy and Materials》2016年第6期637-644,共8页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51204046);the China Postdoctoral Science Foundation (No. 2015M581348);the Postdoctoral Science Foundation of Northeastern University (No. 20150302);the Doctoral Fund of the Ministry of Education of China (No. 20130042130001);the Science and Technology Program of Guangzhou, China (No. 2015B090926013)

摘　　要：Developments in the contents of different typical inclusions in 3104 alloy melt were described during heating and holding processing. The settling process of inclusion particles was investigated by measuring the contents of inclusions in the surface, center, and bottom layers of the molten metal. In the results, main inclusions observed and determined by Prefil and PoD FA methods are MgO, Al2O3, spinel（MgAl2O4）, and TiB2 particles or thin films. It is found that some small particles of Al2O3 and MgO are transformed into spinel particles, and the formation rate increases as the temperature and the holding period of melt increase. The content of inclusions increases from 3.37 mm^2×kg^-1 to 7.54 mm^2×kg^-1 and then decreases to 3.08 mm^2×kg^-1 after holding for 90 min. This is attributed to a settling phenomenon and a significant increase in settling velocity after holding for 60 min. The content of inclusion particles decreases by means of settlement and flotation in liquid aluminum with an increase in holding time. The theoretical analysis and experiment results are in essential agreement with those from industrial production.Developments in the contents of different typical inclusions in 3104 alloy melt were described during heating and holding processing. The settling process of inclusion particles was investigated by measuring the contents of inclusions in the surface, center, and bottom layers of the molten metal. In the results, main inclusions observed and determined by Prefil and PoD FA methods are MgO, Al2O3, spinel（MgAl2O4）, and TiB2 particles or thin films. It is found that some small particles of Al2O3 and MgO are transformed into spinel particles, and the formation rate increases as the temperature and the holding period of melt increase. The content of inclusions increases from 3.37 mm^2×kg^-1 to 7.54 mm^2×kg^-1 and then decreases to 3.08 mm^2×kg^-1 after holding for 90 min. This is attributed to a settling phenomenon and a significant increase in settling velocity after holding for 60 min. The content of inclusion particles decreases by means of settlement and flotation in liquid aluminum with an increase in holding time. The theoretical analysis and experiment results are in essential agreement with those from industrial production.

关 键 词：aluminum alloys inclusions heating holding time settling 

分 类 号：TG292[金属学及工艺—铸造]