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首页> 外文期刊>ISIJ international >Growth of Secondary Dendrite Arms of Fe–C Alloy during Transient Directional Solidification by Phase-field Method
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Growth of Secondary Dendrite Arms of Fe–C Alloy during Transient Directional Solidification by Phase-field Method

机译：相场法在瞬态定向凝固过程中Fe–C合金二次枝晶臂的生长

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摘要

Due to the variations in the local solidification conditions in typical industrial casting processes, dendrites grow under transient rather than steady-state conditions. In this study, the phase-field method was used to study the evolution of secondary dendrite arms of Fe-0.3 wt.% C alloy during transient directional solidification imposed by decreasing the pulling velocity. We find that the dendrite under transient growth conditions is different from the steady-state dendrite, with smaller selection parameter σ * and the dendrite envelope inside the parabola scaled by the tip radius. The secondary arms undergo a ripening process in which other secondary arms remelt by shrinking from their tips, rather than by detachment from the primary stalk. The surviving arms are finer than those found under steady-state growth conditions, and the size of the surviving arms decreases with decreasing growth velocity.
机译：由于典型的工业铸造过程中局部凝固条件的变化，枝晶在瞬态而非稳态条件下生长。在这项研究中，使用相场方法研究了Fe-0.3 wt。％C合金在通过降低拉拔速度而进行的瞬时定向凝固过程中，二次枝晶臂的演变。我们发现，在瞬态生长条件下的枝晶不同于稳态枝晶，选择参数σ*较小，抛物线内的枝晶包络由尖端半径缩放。次要臂经过一个成熟过程，在此过程中，其他次要臂通过收缩而不是从主茎上脱离来重新熔化。存活臂要比稳态生长条件下的存活臂细，存活臂的大小会随着生长速度的降低而减小。

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