【摘要】 钛合金表面氧化在提高耐磨、耐蚀、界面相容性等方面具有重要应用。采用高斯分布的面热源，模拟红外激光制备Ti6Al4V钛合金表面氧化层过程中的温度分布及变化。首先，通过对比激光功率为500 W（功率密度为39.8 W/mm~2）、扫描速度为15 mm/s时钛合金表面和厚度方向温度分布的模拟与试验结果，验证了有限元模型的有效性。然后，采用该模型研究激光功率、扫描速率、重复扫描间隔等对温度场的影响规律。随着激光功率增加，扫描速率降低，加工过程中的线能量增加，钛合金表面和厚度方向的温度整体增加。当线能量相同情况下，由于能量在钛合金表面的累积，大功率高扫描速度下可以获得更高的表面温度和基本相同的内部温度。随着重复扫描间隔的缩小，表面最高温度逐渐升高。更多还原

【Abstract】 The surface oxidation of titanium alloy is widely used to improve wear and corrosion resistance and interfacial compatibility. In this study, a surface heat source with a Gaussian distribution was employed to simulate the temperature field changes during the surface oxide layer preparation on a titanium alloy(Ti6Al4V) using an infrared laser. First, the simulation results of the temperature distributions on the titanium alloy surface and thickness with 500 W laser power(39. 8 W/mm~2 power density) and 15 mm/s scanning speed were compared with the experimental results, verifying further the effectiveness of the finite element model. Next, the verified model was used to study the influence of the laser power,scanning rate, and repeated scanning interval on the temperature field. The simulation results reveal that the line energy increased when the laser power was increased and the scanning rate was decreased. Consequently, the temperature field on the surface and along the thickness increased as a whole. Under the same line energy, a higher surface temperature and a similar internal temperature could be obtained under both high energy and scanning speed because of the energy accumulation on the titanium alloy surface. Moreover, the maximum surface temperature of the titanium alloy increased with the scanning interval reduction.更多还原