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根据扫描电子束焊机的实际工作环境,建立了扫描电子束铝合金表面处理温度场三维有限元分析模型,分析了试样经电子束照射后表面熔池的形态及组织变化,分析过程中,考虑了试样表面的热辐射和材料的相变,并用实验验证了仿真结果。讨论了束流、束斑直径和扫描半径对扫描电子束表面处理温度场的影响。结果表明:在其它参数不变的情况下,随着束流的增大,试样表面的最高温度基本上呈线性增高,熔池的宽度和深度也有所增大;随着束斑直径的增加,试样表面的最高温度呈线性下降,熔池的深度也略有减小,而宽度则快速地增大;随着扫描半径的增加,最高温度、熔池的宽度和深度均急剧下降。
According to the actual working environment of the scanning electron beam welding machine, a three-dimensional finite element analysis model of the surface temperature field of the scanning electron beam aluminum alloy was set up. The morphology and microstructure of the surface molten pool after the electron beam irradiation were analyzed. During the analysis, Considered the heat radiation on the surface of the specimen and the phase change of the material, the simulation results were verified by experiments. The effects of beam current, beam spot diameter and scanning radius on the temperature field of scanning electron beam surface treatment are discussed. The results show that the maximum temperature of the sample surface increases linearly with the increase of the beam current and the width and depth of the weld pool increase with the increase of the beam diameter. , The maximum temperature of the sample surface decreases linearly, the depth of the weld pool decreases slightly and the width increases rapidly. The maximum temperature and the width and depth of the weld pool drop sharply with the increase of scanning radius.