Numerical Simulation On Supersonic Deposition Stellite6 Particles Using The Laser Hybird Technology

The supersonic laser deposition(SLD) is a coating technology which is combined the cold spaying with laser process. The quality of coating can be improved, such as thickness, the deposition efficiency, compactness and the bonding strength between particle and substrate due to laser soften the substrate. In addition, SLD can deposit the hard material on the substrate and retain the structure and properties of original powder. Because SLD offers these advantages, it is an attractive alternative coating technology.The deformation behavior of particle and substrate is important for SLD technology. The deformation behaviors between the particle and substrate cannot be observed directly due to its instantaneous impact. Therefore the software ANSYS/LS-DYNA has been used to simulate the process of particle impacting substrate. Firstly, a 3-D model for supersonic laser deposition of two different material models, such as Johnson-Cook material model and bilinear isotropic hardening material model was established. Based on the two material models, the deposition process which Cu particles impacted on medium steel substrate with different impact velocity and at different deposition site temperature was researched to verify the feasibility of the bilinear isotropic hardening material model in laser hybrid of processing supersonic. And then, bilinear isotropic hardening material model was chose to research the collision process of single stellite6 particle impacting medium steel substrate under different incidence angle. Besides, the deformation behavior of multi-particle impacting substrate was also simulated under different impact velocity and at different deposition site temperature. The conclusion can be obtained as followed:1. Cu particles can deposit on medium steel effectively with the velocity of 800m/s and at room temperature or the velocity of 500m/s and at deposited site temperature of 850℃. The simulation result of Johnson-Cook material model is consistent with the result of bilinear isotropic hardening material model. The models both can be used to predict the process parameters of supersonic laser deposition.2. Particles can be deposited on substrate effectively when the angle is less than 20°. But particles cannot be deposited on substrate when the incidence exceeds 20°.3. During the collision process of multi-particles, the deformation particle would fill the space between particles under the mutual crushing effect occurs among particles and the compaction effect by multi-granule vertical impaction.4. Stellite6 particles can be deposited on medium steel effectively with the laser heating effect improving the mechanical properties and material properties of substrate...