| COMPUTATIONAL SIMULATION |
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| Effects of Particle Shape and Temperature on Its Deposition Character in Cold Spray |
| WANG Feng 1,2
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1 College of Power Engineering, Chongqing University, Chongqing 400030;
2 Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, Chongqing University, Chongqing 400030; |
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Abstract In order to improve magnesium alloy anti-corrosion performance, cold spray technology was adopted as surface modification method and particles deposition process has been simulated. In this work, finite element analysis (FEA) with Arbitrary Lagrange Eulerian (ALE) grid method was used to simulate Al particles deposition behavior on Mg alloy substrate in cold spray. The deformation process and temperature distribution in particle and substrate were investigated. Effects of particle shape, different particle and substrate initial temperature on particle deposition and rebound performance were also considered. Results show that the effect of particle shape on its local deformation and substrate deformation in impact process is significant. It is found that the effects of particle initial shape and velocity on particle rebound kinetic energy rate, substrate crater depth, maximum relative contact area between particle and substrate are obvious. Preheating of particle-substrate system is beneficial to their combination. The distributions of temperature and plastic deformation are symmetric when ellipsoid particle impacts on substrate vertically along its long axis and sphere particle impacts on substrate vertically. Results can be used as a reference for cold spray experiment parameters selection and optimization.
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Published: 04 May 2018
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2017, Vol. 31 
