Grain Refinement of a Large-Scale Al Alloy Casting by Introducing the Multiple Ultrasonic Generators During Solidification

摘要

Based on the multiple ultrasonic generators, a new technique was reported to produce the large-scale Al alloy castings for downstream deformation processing. The effects of different configurations of ultrasonic generators on the degree and homogeneity of grain refinement were investigated during solidification. Experimental results show that a grain-refined structure with reduced macrosegregation was obtained in the large-scale cylindrical Al alloy ingot (650 mm in diameter, 4800 mm in length). Meanwhile, the role of ultrasonic treatment in the production of large-scale castings was discussed. Additionally, these results raise some new questions regarding the relationship between ultrasonic physics and grain refinement, which require further studies.