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试验采用功率超声双振动头装置制备出球化的非枝晶A356半固态浆料,随即将浆料用于流变模锻。通过对比锻件不同位置的金相组织,发现锻件上、下两端的晶粒较细小,中间部分的晶粒较粗大且液相少。分析了半固态浆料在压力条件下的浆料内部的运动过程。研究了在640℃浇注温度下,经过功率超声处理与未经过超声处理的锻件力学性能,发现经过超声处理的浆料进行模锻所得的锻件力学性能更优。
The experiment uses the power ultrasonic double vibrating head device to prepare the nodular non-dendritic A356 semi-solid slurry, and then uses the slurry for the rheo-die forging. By comparing the metallurgical structure of the forgings at different positions, it is found that the grains at the upper and lower ends of the forging are finer, the grains in the middle part are coarser and the liquid phase is less. The movement of slurry in the semi-solid slurry under pressure was analyzed. The mechanical properties of the forged parts after ultrasonic treatment at ultrasonic pouring temperature of 640 ℃ were studied. The mechanical properties of the forged parts obtained by ultrasonic treatment were found to be better.