Abstract: It has great theoretical and practical significance in researching the scanning electron beam surface treatment stress distribution for understanding the formation mechanism of residual stress. Based on the thermal elastoplastic theory, a finite element model of electron beam surface treatment stress field is established to analysis the influence of high temperature thermodynamics parameters on the stress distribution of aluminum after electron beam surface treatment. Through the method that simulation combined with experimental verification, the material thermodynamic parameters of the high temperature is determined and the distributions of the stresses of the aluminum alloy surface after scanned is obtained. ADC12 aluminum alloy area deformation and the maximum stress increased nonlinearly with elastic and shear modulus. Tensile stress centralize nearby scanning band of sampling surface after surface treated, compressive stress centralized at the other location. The maximum tensile stress is present in the inner side of scanning band, the lateral border is lower than that, the value in the middle of scanning band is the lowest. The maximum surface stress is 127.6 MPa, deformation comes to 1.8 mm.

Key words: Electron beam surface modification, Finite element analysis, Residual stress, Stress field, Temperature field