Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy
Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy
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DOI：
10.1007/s00170-011-3299-1
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发表时间：
2011-11-01
影响因子：
3.4
通讯作者：
Rush, Matthew
中科院分区：
文献类型：
--
作者：
Wang, Fude;Williams, Stewart;Rush, Matthew
研究了脉冲钨极氩弧焊工艺参数对Ti6 Al 4V堆焊层形貌的影响。峰值/基值电流比和脉冲频率被发现对细化先前的β晶粒尺寸没有显着的影响。然而，据发现，在给定的热输入下，送丝速率对先前的β晶粒细化具有相当大的影响。这是由于额外的线输入能够提供许多非均质成核位点，并且还导致液相线前部的负温度梯度，这阻碍了柱状生长并将柱状生长改变为等轴生长。
The effects of pulsed gas tungsten arc welding parameters on the morphology of additive layer manufactured Ti6Al4V has been investigated in this study. The peak/base current ratio and pulse frequency are found to have no significant effect on the refinement of prior beta grain size. However, it is found that the wire feed rate has a considerable effect on the prior beta grain refinement at a given heat input. This is due to the extra wire input being able to supply many heterogeneous nucleation sites and also results in a negative temperature gradient in the front of the liquidus which blocks the columnar growth and changes the columnar growth to equiaixal growth.