As an economic and direct route to continuous thin strip production from the melt, twin roll casting (TRC) has been established as an effective process for aluminium alloys. Its adaptation to casting of bulk amorphous alloy strip necessitates matching of the thermal and mechanical behaviour of the cooling multi-component melt to the requirements (especially cooling rate, and strip exit temperature and thermal gradient) of vitrification. Using a dedicated control volume numerical model of TRC, simulation of the casting of 2 mm thick Vit 1 (Zr41.2Ti13.8Cu12.5Ni10Be22.5) alloy strip shows that the acceptable casting speeds are in the range 2.5 to 3.5 cm/s. The effects of varying strip thickness and strip-roll heat transfer coefficient (HTC) on this casting window are assessed. The differences between modelling of conventional alloy solidification and metallic glass formation are presented.
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机译:作为从熔体连续生产薄带的经济,直接的途径,双辊铸造(TRC)已被确立为铝合金的有效工艺。为了适应块状非晶态合金带材的铸造,必须使冷却的多组分熔体的热和机械性能与玻璃化的要求(尤其是冷却速率,带材出口温度和热梯度)相匹配。使用TRC的专用控制体积数值模型,对2 mm厚的Vit 1(Zr41.2Ti13.8Cu12.5Ni10Be22.5)合金带材的铸造模拟显示,可接受的铸造速度范围为2.5至3.5 cm / s。评估了改变带钢厚度和带钢辊传热系数(HTC)对该铸造窗口的影响。提出了常规合金凝固建模与金属玻璃形成之间的差异。
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