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根据激光沉积修复的热传导特点,利用有限元法中的生死单元技术,建立了激光沉积修复TA15钛合金的过程模型,采用参数化设计语言编程实现对多道多层激光沉积修复过程三维热应力场的数值模拟。研究了不同功率、不同扫描速度下以及对修复基体预热后热应力的动态分布规律,并对热应力变化的原因进行了分析。结果表明,随着激光功率的减小、扫描速度的增大热应力呈减小趋势,对修复基体预先加热,可以有效调控热应力的产生和演化,为降低激光沉积修复过程中的热应力,提高修复质量提供理论依据。
According to the heat conduction characteristics of laser deposition repairing, the process model of laser deposition repairing TA15 titanium alloy is established by using the life and death cell technology in the finite element method. The parametric design language programming is used to realize the three-dimensional thermal stress field Numerical simulation. The dynamic distribution of thermal stress under different power, scanning speed and preheating of the repaired substrate was studied. The reason of thermal stress was also analyzed. The results show that with the decrease of laser power, the thermal stress increases with the increase of scanning speed. The preheating of the repaired substrate can effectively control the generation and evolution of thermal stress. In order to reduce the thermal stress during laser deposition and repair, Improve the quality of repair to provide a theoretical basis.