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依据有限元建模思想,采用高斯表面热源,同时考虑相变潜热与温度的关系,应用ABAQUS软件建立了Q235钢基体上激光重熔合成Fe-Al涂层的温度场和应力场计算模型,研究了激光功率和扫描速度对温度场和应力场的影响。结果表明,提高激光功率对增大热影响区深度效果不大,反而会形成较大的熔池而使重熔表面粗糙;与激光功率相比,扫描速度对温度场影响较小;涂层与基体合金化区沿着激光扫描方向的拉应力远大于垂直扫描方向的拉应力;结合界面处的残余应力与扫描速度成正比,与激光功率成反比,且扫描速度对残余应力的影响较激光功率显著。实验结果较好地验证了模拟结果,表明所建立的温度场和应力场计算模型是正确和可靠的。
According to the finite element modeling method, the Gaussian surface heat source was used and the relationship between the latent heat and the temperature was considered. The calculation model of temperature field and stress field of the laser remelted Fe-Al coating on Q235 steel substrate was established by ABAQUS software. Effects of Laser Power and Scanning Speed on Temperature Field and Stress Field. The results show that increasing the laser power has little effect on increasing the depth of HAZ, but instead of forming a larger weld pool, the remelting surface becomes rough. Compared with the laser power, the scanning speed has little effect on the temperature field. The tensile stress along the laser scanning direction in the matrix alloying zone is much larger than the tensile stress in the vertical scanning direction. The residual stress at the bonding interface is proportional to the scanning velocity and inversely proportional to the laser power. The influence of the scanning velocity on the residual stress is better than that of the laser power Significant. The experimental results verify the simulation results well, which shows that the established models of temperature field and stress field are correct and reliable.