Numerical Simulation of Influence of Preheating Temperature on Laser Deposition Quality in Flame Tube
The flame cylinder of aeroengine is prone to various kinds of damage,so it is of great significance to study its repair technology.In order to study the effect of preheating temperature on the inner wall quality of flame tube repaired by laser deposition,a finite element analysis software was used to conduct sequential thermal coupling numerical simulation of flame tube model.The results show that preheating matrix can effectively reduce the distribution range of residual stress and eliminate the phenomenon of local stress concentration.After preheating,the peak value of residual stress on the surface of the matrix increases,the distribution range increases,but the local stress concentration decreases.The peak value of residual stress along the radial direction decreases,and the residual stress along the radial direction decreases with the distance.By studying the residual stress after laser deposition of flame tube model at different preheating temperatures,the optimal preheating temperature for laser deposition repair of flame tube is 300℃,which provides a reference for the preheating temperature in the actual repair process.
flame tubelaser depositionnumerical simulationpreheatresidual stress field
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