Effect of centrifugal counter-gravity casting on solidification microstructure and mechanical properties of A357 aluminum alloy

Li Xinlei; Hao Qitang; Miao Xiaochuan; Fan Li
January 2014
China Foundry;Jan2014, Vol. 11 Issue 1, p14
Academic Journal
To investigate the influence of Centrifugal Counter-gravity Casting (C3) process on the solidification microstructure and mechanical properties of the casting, A357 aluminum alloy samples were produced by different process conditions under C3. The results show that C3 has better feeding capacity compared with the vacuum suction casting; and that the mechanical vibration and the convection of melts formed at the centrifugal rotation stage suppress the growth of dendrites, subsequently resulting in the refinement of grains and the improvement of mechanical properties, density and hardness. A finer grain and higher strength can be obtained in the A357 alloy by increasing centrifugal radius and rotational speed. However, casting defects will appear near the rotational axis and the mechanical properties will decrease once the rotational speed exceeds 150 r·min-1.


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