中国激光, 2019, 46 (7): 0702007, 网络出版: 2019-07-11   

开放环境下钛合金激光熔覆局部保护气体的质量分布 下载: 1262次

Mass Distribution of Local Shielding Gas for Laser Cladding of Titanium Alloy in Open Environment
作者单位
苏州大学机电工程学院, 江苏 苏州 215021
摘要
针对开放大气环境下钛合金激光熔覆层极易氧化的问题,设计了一种可在熔池附近形成局部气氛的同轴保护气罩。采用FLUENT软件建立了光内送粉同轴熔覆喷嘴的三维模型,模拟分析保护气道的入口数量、角度及保护气体流量对氩气质量分布的影响。结果表明:气罩保护气体入口数量与氩气分布的对称性有关;入口角度对氩气质量分布的影响较小;增大保护气体的流量会极大地提高有效保护范围。根据保护气罩结构优化参数,选用氩气作为保护气,进行开放大气环境下Ti-6Al-4V合金的激光熔覆实验,熔道表面呈银白色,熔覆层饱满,验证了同轴保护气罩的保护效果。
Abstract
Considering the serious oxidation of titanium alloy induced by laser cladding in air, a coaxial nozzle with shielding gas is designed to protect the molten pool. A three-dimensional numerical model of the coaxial cladding nozzle with inside-laser powder feeding is established using FLUENT software, and the influences of the inlet number, angle, and flow rate of shielding gas on the mass fraction of argon are analyzed. The results demonstrate that the inlet number of the shielding gas is related to the symmetry of argon distribution. The inlet angle has little effect on the mass distribution of argon; however, increasing the flow rate of the shielding gas will greatly improve the effective protection domain. According to the optimized parameters of the coaxial shielding gas nozzle, the laser cladding of the Ti-6Al-4V alloy in an open environment is conducted by using argon as the shielding gas. The surface of the molten track presents silvery white and the cladding layer is fine, indicating that the coaxial gas nozzle can effectively protect the molten pool from oxidation.

李刚, 张津超, 石世宏, 程东霁. 开放环境下钛合金激光熔覆局部保护气体的质量分布[J]. 中国激光, 2019, 46(7): 0702007. Gang Li, Jinchao Zhang, Shihong Shi, Dongji Cheng. Mass Distribution of Local Shielding Gas for Laser Cladding of Titanium Alloy in Open Environment[J]. Chinese Journal of Lasers, 2019, 46(7): 0702007.

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