Study And Analysis On The Effect Of Different Incidence Angles And Material Property For Intruding Process In Cold Spraying

Cold gas dynamic spray (for short: cold spray) is distinguished from thermal spray that is used widely at present. It is a new emerging technology to transform material property. It is a process that with normal or relatively low-temperature unable to melt the powder material and work piece and destroy their mechanical property, the metallic powder is carried by supersonic gas which is formed in a convergent-divergent spray nozzle and sprays onto the substrate to form compact coating. Since the disadvantage and shortage caused from thermal spray technology can be avoided, it is received more and more attentions from internal and external scholars' recognitions.In this paper, the process that the metallic powder particle impacts the work piece is studied. It is revealed that the relations among different performance powder material, substrate and thermal gas dynamic parameters and is provided that the powerful guarantees for choosing optimum controlling parameters, completing experiment projects, optimizing parameters collocation.In this study, the collision process of single particle impacting substrate under tilting angle is simulated by finite element program LS-DYNA. It is investigated that the distortion behavior of both particle and substrate, the evolution of maximum plastic strain, the occurring of adiabatic shear instability and relation between tilting angle and critical velocity through changing tilting angles. The collisions of different metallic material are also simulated to study the effect of material parameters especially elastic module and yield limit related to mechanical performance. It is analyzed that the distortion behavior of both particle and substrate, the evolution of maximum plastic strain and characteristic curve of characteristic node.It is found that the normal component of impact velocity takes an important role in the impacting process and formation of bonding under oblique collision. The material parameters of particle and substrate are i(?)portant factor in coating formation. The numerical simulated results according with experiment results indicate the analysis conclusions are reliable.