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研究了Ti3Al基合金与TC11钛合金采用不同参数的电子束焊接的双合金件,经近等温锻造和热处理后,近等温锻造工艺参数对合金元素在焊接界面上扩散的影响。结果表明,应变速率和变形量对不同参数焊接的双合金件焊接界面合金元素扩散的影响类似,均随着应变速率的降低及变形量的增大扩散更充分。但当变形20%时,合金元素以沿晶界扩散的管道机制为主;当变形40%时,扩散以晶间扩散机制为主。此外,Ti元素在焊缝区的反常扩散是由于Ti原子的点阵位置被从Ti3Al侧扩散而来的Nb原子所占据,被替代的Ti原子从DO19六方有序结构中扩散出来聚集所造成。
The effects of near-isothermal forging parameters on the diffusion of alloying elements at the welding interface were investigated by means of near-isothermal forging and heat treatment after the dual-alloy parts of Ti3Al-based alloy and TC11 titanium alloy were welded by electron beam with different parameters. The results show that strain rate and deformation have similar effects on the diffusion of alloying elements at the welding interface of two alloy parts with different parameters, both of which are more fully diffused with the decrease of strain rate and deformation. However, when the deformation is 20%, the alloying elements are dominated by the pipeline mechanism which spreads along the grain boundary. When the deformation is 40%, the diffusion is dominated by intergranular diffusion. In addition, the anomalous diffusion of Ti element in the weld zone is caused by the fact that the lattice position of Ti atoms is occupied by Nb atoms diffused from the Ti3Al side, and the replaced Ti atoms are diffused out of the hexagonal ordered structure of DO19.