Effect of bucket temperature on grain morphology of semi-solid melt A356 by micro fused-casting
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摘要: 研究了筒体温度对微熔铸半固态熔体铝合金A356晶粒形貌的影响。结果表明, 在适当的温度范围内, 配合一定的搅拌速度, 能形成组织均匀、晶粒细小的A356半固态熔体。当筒体温度为620℃, 搅拌速度为800r·min-1时, 可制备出优质的A356半固态熔体, α-Al晶粒的平均尺寸为54μm, 形状因子为0.66, 熔体样品的显微硬度为HV 82.97。Abstract: Effect of bucket temperature on the grain morphology of semi-solid melt A356 aluminum alloy by micro fused-casting was studied in this paper.In the results, the semi-solid melt A356 with uniform microstructure and fine grain can be formed at the appropriate temperature and a certain stirring speed.The semi-solid melt A356 in high quality can be prepared at the bucket temperature of 620 ℃ in the stirring velocity of 800 r·min-1, the average size of α-Al grains is 54 μm, the shape factor is 0.66, and the Vickers hardness is HV 82.97.
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Key words:
- semi-solid melt /
- grain morphology /
- temperature /
- aluminum alloy /
- micro fused-casting
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图 1 微熔铸半固态晶粒用石墨坩埚结构
Figure 1. Structure of graphite crucible used for semi-solid melt by micro fused-casting
图 2 晶粒形态表征测量示意图: (a)圆面积; (b)等效面积; (c)等效直径; (d)周长
Figure 2. Measurement schematic diagram for grain morphology characterization: (a) circle area; (b) equivalent area; (c) equivalent diameter; (d) perimeter
图 3 铝合金A356铸锭差示扫描热分析曲线
Figure 3. Differential scanning calorimeter curves of A356aluminium alloy ingot
图 4 不同筒体温度下铝合金A356半固态显微组织形貌: (a) 610℃; (b) 620℃; (c) 630℃; (d) 640℃; (e) 650℃; (f) 660℃
Figure 4. Morphology of semi-solid A356 aluminum alloy at different bucket temperatures: (a) 610℃; (b) 620℃; (c) 630℃; (d) 640℃; (e) 650℃; (f) 660℃
图 5 筒体温度对A356半固态熔体晶粒形态的影响
Figure 5. Effect of bucket temperature on the grain morphology of A356 semi-solid melt
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