Numerical Simulation Characteristics Of Stellite 6 Particle Impact On Steel Substrate In Supersonic Laser Deposition Based On ABAQUS

The supersonic laser deposition(SLD)is based on the cold spraying technology.With laser heating the substrate,it overcomes the drawback of the cold spraying technology that cannot deposit high hardness materials and brittle materials,and it can deposit Stellite 6 on medium carbon steel effectively,but the mechanism of the coating formation is unclear.Therefore,the research of numerical simulation can provide the reference to explore the mechanism of the high hardness alloy coating formation through simulating the deformation behavior of Stellite 6 in the collision process.As the material constitutive model of the Stellite 6 is not yet perfect,the material model of Stellite 6 deposited by supersonic laser deposition is mainly used the bilinear isotropic hardening model,and the accuracy of the material model is very important for analyzing the deformation behavior between the particles and substrate in the collision process.Therefore,obtain the required material data of Stellite 6 via MTS tensile testing,a comprehensive investigation on particle and substrate deformation behavior under different impact velocities,deposition site temperatures and collision angles are conducted by experimental method and numerical method based on Johnson-Cook constitutive mode and bilinear isotropic hardening constitutive mode.The conclusion can be obtained as followed:(1)The Johnson-Cook constitutive mode is conducted to study the process of single Stellite 6 particle impacting steel substrate,the deposition morphology of particle and the deformation characteristic between particle and substrate are consistent with the experimental results,and it was better than the simulation results of the bilinear isotropic hardening constitutive mode.(2)It exists critical speed and speed limit for particle to deposit on the surface of substrate,and the Stellite 6 particle can deposit on medium steel effectively at 1100?,and the velocity is range from 450m/s to 500m/s.(3)The particle can deposit effectively with the velocity of 430m/s and at the deposited site temperature range from 1000? to 1100?,it do not occur the metal sputtering phenomenon in the process of collision,therefore,the effective combination method between particle and substrate is mainly mechanical bonding.(4)Indentation depth decreases with the increase of incident angle,when the impact angle of particle is range from 0 °to 10 °,it is benefit to the bonding between the particle and the substrate.(5)During the collision process of multi-particles,the compaction effect of subsequent incident particles can increase the plastic deformation of the previously deposited particles.