Simulation of microstructure evolution in fused-coating additive manufacturing based on phase field approach

China Foundry

Zheng-ying Wei¹  Jun Du²  Ru-wei Geng³ 

[1] 1. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2. Collaborative Innovation Center of High-End Manufacturing Equipment, Xi’an 710049, China;Collaborative Innovation Center of High-End Manufacturing Equipment, Xi’an 710049, China;State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: phase field;    microstructure evolution;    fused-coating additive manufacturing;   

DOI  :  

来源: DOAJ

【 摘 要 】

The mechanical properties of metal components are determined by the solidification behaviour and microstructure. A quantitative phase field model is used to investigate the microstructure evolution of fused-coating additive manufacturing, by which to improve the quality of deposition. During the fused-coating process, the molten metal in a crucible flows out of a nozzle and then reaches the substrate. The solidification happens at the moment when the molten metal comes into contact with substrate moving in three-dimensional space. The macroscopic heat transfer model of fused-coating is established to get the temperature field considered as the initial temperature boundary conditions in the phase field model. The numerical and experimental results show that the morphology of grains varies with different solidification environments. Columnar grains are observed during the early period at the bottom of fused-coating layer and the equiaxed grains appear subsequently ahead of the columnar grains. Columnar dendrites phase field simulations about the grains morphology and solute distribution are conducted considering the solidification environments. The simulation results are in good agreement with experimental results.

【 授权许可】

Unknown