Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (8): 1123-1128.DOI: 10.12068/j.issn.1005-3026.2020.08.010

• Mechanical Engineering • Previous Articles     Next Articles

Powder Mixing Mechanism of Laser Cladding Forming for Adaptive FGM

XIN Bo, CHENG Guang, YAO Jun, GONG Ya-dong   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-12-27 Revised:2019-12-27 Online:2020-08-15 Published:2020-08-28
  • Contact: XIN Bo
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Abstract: Fast and accurate mixing of multiphase powder is the foundation of forming parts from adaptive functional graded materials(A-FGM). In order to improve the powder mixing homogeneity driven by gas, a numerical analysis model of gas-solid two-phase flow was established. The Reynolds time average method was used for numerical simulation. A kind of powder mixing equipment driven by carrier gas was designed. A finite element method based on ANSYS-FLUENT was used to analyze the effect of mixing parameters and configurations on the flow field in the powder mixer. The experiment for testing mixing homogeneity based on elemental analysis and image processing was designed. The results show that the gas-dynamic mixing mechanism of the alloy powders is mainly in convective mix. As the average velocity and displacement of the powders increase, the powder flowability can be improved to increase the mixing homogeneity.

Key words: adaptive functional graded materials (A-FGM), laser cladding forming, powder mixing, gas-solid two-phase flow

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