摘要
The effect of the inlet gas pressure,supplementary gas pressure and nozzle channel dispersion angle on the pre-breakup behavior of Ti-6Al-4V(TC4)discontinuous droplets during EIGA was investigated by combining numerical simulation with experiments.The results show that the axial velocity at the recirculation zone before the stagnation location was first increased and decreased then increased significantly after the peak value,while the pressure of the recirculation zone increased with the increase in inlet pressure.With the supplementary pressure increasing,the velocity magnitude and range of the recirculation zone gradually decreased.As the dispersion angle of the nozzle channel increased,the pre-breakup efficiency of droplets gradually decreased,but the adhesion phenomenon of droplets on the inner wall surface of the nozzle channel(IWSNC)gradually weakened.Under the inlet pressure of 4 MPa,a supplementary pressure of 0.05 MPa,and the dispersion angle of 15°,the uniform and spherical TC4 powders with diameter of 70μm were prepared,which was consistent with the simulation results.The optimized process parameters is a balance between the size of the pre-atomized particles and the back-spraying and bonding phenomenons of droplets.
作者
邹海平
LI Fenglei
NGAI Tungwai
XIAO Zhiyu
ZOU Haiping;LI Fenglei;NGAI Tungwai;XIAO Zhiyu(National Engineering Research Centre of Near-Net Shape Forming for Metallic Material,South China University of Technology,Guangzhou 510640,China;Jiangxi Qianyue New Materials Co.,Ltd.,Ganzhou 341003,China;Hejun College,Ganzhou 342600,China)
基金
Funded by the National Natural Science Foundation of China(No.51627805)
the Natural Scienceof Guangdong Province,China(No.2015A030312003)
the Science and Technology Research Project of Guangdong Province,China(No.2014B010129003)。
