首页> 外文会议>Modeling of Casting, Welding and Advanced Solidification Processes XI vol.1 >COLUMNAR TO EQUIAXED TRANSITION IN DIRECTIONAL SOLIDIFICATION PROCESSING OF ALUMINIUM ALLOYS
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COLUMNAR TO EQUIAXED TRANSITION IN DIRECTIONAL SOLIDIFICATION PROCESSING OF ALUMINIUM ALLOYS

机译:铝合金定向凝固过程中的从柱到均等过渡

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The understanding and control of the transition from columnar to equiaxed structure (CET) are key points to obtain desired final properties of industrial products. The main objective of this investigation is to clarify the CET phenomenon and the parameters involved to better monitor CET. Two different aluminium based alloys are chosen in order to study the effect of the solute: Al-3.5wt%Ni and Al-7wt%Si with and without refining particles (particles added to promote equiaxed nucleation). Several experiments are carried out in a Bridgman-Stockbarger furnace for which the thermal gradient and pulling velocity can be independently controlled. In a first series of experiments, CET is provoked by a sharp or slow velocity jump at a constant thermal gradient and we compare the results obtained with the different alloys. Additionally, the thermal gradient is also varied to understand the effect of the different solidification parameters. The efficiency of the particles is studied as well as the possible occurrence of fragmentation in some cases. These results are discussed in relation to available models and to other experiments.
机译:从柱状结构到等轴结构(CET)过渡的理解和控制是获得所需工业产品最终性能的关键点。这项研究的主要目的是弄清CET现象和更好地监控CET所涉及的参数。为了研究溶质的作用,选择了两种不同的铝基合金:Al-3.5wt%Ni和Al-7wt%Si(带有和不带有精炼颗粒(添加了促进等轴形核的颗粒))。在Bridgman-Stockbarger炉中进行了几个实验,可以独立控制热梯度和提拉速度。在第一批实验中,CET是由恒定温度梯度下的急剧或缓慢的速度跳跃引起的,我们比较了使用不同合金获得的结果。此外,热梯度也会变化,以了解不同固化参数的影响。研究了颗粒的效率以及在某些情况下可能发生碎裂的情况。讨论了有关可用模型和其他实验的结果。

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