Reasons Analysis and Process Improvement on Feathery Grains Defect of7N01 Aluminum Alloy Round Ingot
Author of the article:ZHANG Guowei
Author's Workplace：Department of Electrical Engineering,Guangxi Technological College of Machinery and Electricity,Nanning 530007,China
Key Words：7N01 round ingot feathery grains formation reason process improvement
Abstract：
The formation reasons of feathery grain defects for 7N01 aluminum alloy round ingot was investigated by ways of macrostructure, microstructure observation and energy spectrum chemical composition analysis, and some corresponding manufacturing process improvement measures had been also carried out. The results show that the main causes of?feathery grains formation for 7N01 aluminum alloy round ingot are large temperature gradient in crystallization front and less nucleation cores. Feathery grain defects of 7N01 aluminum alloy round ingot can be prevented and the macro-grain size of ingot can be decreased from grade 3 to grade 2 by decreasing temperature gradient in crystallization front and increasing nucleation cores, such as reducing casting temperature, decreasing cooling water flow, increasing casting speed, choosing proper Al Ti5B1 for grain refining, speeding up wire feeding and prolonging electromagnetic stirring time for manufacturing process optimization.
