| Citation: | LIU Jingang, ZHENG Jianyun, CHEN Jianwen, et al. Residual stress control in electron beam welding of titanium alloy medium and thick plates for aviation[J]. Journal of Aerospace Power, 2023, 38（8）：1814-1825 doi: 10.13224/j.cnki.jasp.20220852
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Based on thermo-elastic-plastic theory, a welding finite element simulation model of TC4 titanium alloy medium and thick plates for aviation was established to study the magnitude and distribution of residual stress after electron beam welding and heat treatment. A combined heat source model of double ellipsoidal with conical heat source was used to simulate the heat input of the electron beam, and the effect of solid-state metallurgical phase transformation was considered in the finite element model. The results showed that the residual stress measured by simulation and experiment was more consistent when considering solid metallurgical phase transformation, so the effectiveness of the established simulation model was verified. At the same time, it was found that there was a large longitudinal residual tensile stress at the weld position, and its peak value can reach 842.6 MPa. As the distance from the center of the weld increased, the longitudinal residual stress decreased continuously, and residual stress presented a transformation from tensile type to compressive type on both sides of the weld and became approximately 0 MPa at the edge of the base metal. Through analysis, it was found that the heat treatment method can effectively reduce the residual stress in the weldment and also made the residual stress distribution in the weldment more uniform. Among the heat treatment parameters, the heating temperature had an obvious effect on reducing the residual stress, and the peak value of the longitudinal residual tensile stress can be reduced by 43.3% when the heating temperature was 973 K.
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