Semisolid strip casting using a twin roll caster equipped with a cooling slope
Semisolid strip casting using a twin roll caster equipped with a cooling slope
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DOI：
10.1016/s0924-0136(02)00765-3
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发表时间：
2002-12
影响因子：
6.3
通讯作者：
T. Haga
中科院分区：
文献类型：
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作者：
T. Haga
采用带冷却坡的熔体拖拽双辊连铸机（MDTRC）对A356铝合金进行了半固态流变铸造。设备和操作非常简单；采用铜辊，为了提高冷却速度，不使用润滑剂。生产出来的带材不粘在卷筒上。假设固体含量为5-10%，熔融金属沿冷却坡流下后变为半固态。以30 ~ 90m/min的速度成功地从半固态浆料中浇注出带钢；即，利用半固态铸造的效果，提高了铸造速度。带材厚度2-2.5mm。经轧制和热处理后，拉伸强度为270MPa，伸长率为18%。退火后的带材在进行180°弯曲试验时没有断裂。采用半固态连铸工艺提高了带材的力学性能。在中厚层，初生晶呈球形而非枝晶，晶粒尺寸小于50μm；共晶Si小于5μm。
A356 aluminum alloy was subjected to semisolid strip casting, a type of rheocasting, by use of a melt drag twin roll caster (MDTRC) equipped with a cooling slope. Equipment and operation are very simple; copper rolls were employed, and, in order to increase cooling rate, no lubricant was used. The produced strip did not stick to the roll. Molten metal became semisolid after flowing down the cooling slope, assuming a solid content of 5–10%. The strip was successfully cast from semisolid slurry at speeds ranging from 30 to 90m/min; i.e., casting speed was improved by the effect of semisolid casting. Strip thickness was 2–2.5mm. After rolling and heat treatment, tensile strength was 270MPa and elongation was 18%. After annealing, the strip was not broken when subjected to a 180° bending test. The mechanical properties of the strip were enhanced by semisolid strip casting. In the middle thickness of the strip, primary crystals were spherical rather than dendritic, and had a size smaller than 50μm. Eutectic Si was smaller than 5μm.