温度场模拟激光熔覆TC11钛合金工艺参数的选择

Parameter selection of laser cladding TC11 titanium alloy simulated by temperature field

以通过激光熔覆修复钛合金薄壁件并在钛合金表面获得优质激光熔覆涂层为目标,运用ANSYS软件对同步送粉式激光熔覆的温度场进行了三维建模数值模拟。基于该模型对激光熔覆过程中的温度场分布和工艺参数进行了分析。结果表明,激光扫描方向前方的表面温度场相比后方熔池温度小,等温线密集,温度梯度大,熔覆两道后熔覆道1没有重熔,并且对熔覆道2产生预热作用。激光加工的快速加热和冷却的特性显著,冷却时的冷却速度可达10~4℃/s,在其他工艺参数不变的情况下,理论上在激光功率P=1100 W,扫描速度v=4 mm/s,光斑直径d=1 mm时模拟过程可获得良好的冶金结合,为修复薄壁零件提供了借鉴和指导作用。

To repair the titanium alloy thin-wall parts by laser cladding and obtain high quality laser cladding coating on the surface of titanium alloy,three-dimensional model of temperature field for synchronous powder feeding laser cladding was established and simulated by ANSYS software,and the distribution of temperature field and process parameters were analyzed in the process of laser cladding. The results show that the front temperature field has the characteristics of low cladding temperature,intensive isotherm and large temperature gradient along laser scanning direction,compared with the latter temperature field. After cladding two cladding channels,cladding channel No. 1 hasn＇ t been remelted and also has a preheating effect on cladding channel No. 2. Laser processing has the remarkable characteristics of rapid heating and cooling,and the cooling rate reaches during cooling. Under the invariability of other process parameters,when laser power is 1100 W,scanning speed is 4 mm/s,spot diameter is 1mm,the simulation process gets a good metallurgical bond theoretically. This study provides a reference and guidance for the repair of thin-wall parts.