电弧增材制造Ti-6Al-4V钛合金在不同扫描策略下的初生β晶组织宏观形态演变

Effects of Different Deposition Strategies on Prior-β Grain Morphology of Wire and Arc Additive Manufactured Ti-6Al-4V Components

基于电弧增材制造的方法,研究了不同沉积方向及层间间隔时间对电弧增材制造Ti-6Al-4V钛合金直壁墙的宏观组织特征的影响。双向扫描和单向扫描分别获得了竖直生长和倾斜生长的柱状初生β晶组织。通过增加层间间隔时间至120 s获得了全等轴初生β晶组织。结果表明,底部的等轴初生β晶组织的形成是由于发生了再结晶。等轴初生β晶组织的晶粒大小同时受到热循环和再结晶两方面因素的共同作用。

Macrostructural characterization was performed for Ti-6 Al-4 V components fabricated by wire and arc additive manufacturing(WAAM) to investigate the effects of different deposition direction and interlayer dwell time on prior-β grain morphology. The bidirectional and unidirectional travel directions led to different growth directions of columnar prior-β grains. By extending the interlayer dwell time between each deposited layer to 120 s, the full equiaxed prior-β grains were obtained. The results indicate that the equiaxed prior-β grains at the bottom of the deposited wall are caused by recrystallization. The sizes of the equiaxed prior-β grains at the bottom are both affected by the thermal cycle and the recrystallization.