1 Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China 2 AECC Gas Turbine Establishment, Chengdu 610500, China 3 High Temperature Material Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract: In this paper, the weld quality of GH4065A alloy under different electron beam welding (EBW) conditions was studied. The causes of welding cracks and the mechanism of crack suppression by double-spot EBW were discussed. The microstructure and mechanical properties of the welded joint were tested and analyzed. It was found that the double-spot EBW can effectively connect GH4065A alloy, and the weld quality can meet the requirements of grade I in HB7608-1998. However, the conventional EBW was easy to crack. The results showed that the weld zone (WZ) of the EBW joint was dominated by dendrites, and there was segregation of Nb and Ti elements. The γ′ strengthening phase gradually coarsened from the weld to the matrix. The difference of microstructure between the WZ and the matrix was the main reason for the reduction of tensile plasticity at high temperature. The simulation results showed that the double-spot EBW can reduce the energy concentration in the welding process, improve the cooling speed of the weld, and reduce the tendency of cracking. After aging treatment, the strength coefficient of welded joint at 25—750 ℃ was over 96%, and the elongation of welded joint at 750 ℃ was 9%, indicating that EBW was an effective joining method of GH4065A alloy structure.
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2020, Vol. 34 
