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研究经近等温变形的Ti3Al/TC11双合金在梯度热处理前后,焊接界面显微组织和显微硬度的变化。结果表明,Ti3Al侧热影响区的显微组织在梯度热处理前后变化较小是因为晶界α2相较稳定;焊缝区显微组织变化较大,究其原因是近等温变形造成的晶粒破碎和Ti、Al、Nb等原子的扩散,造成α、α2相互制衡,致使不能形成连续晶界α2或晶界α;TC11合金基体经过梯度热处理后从网篮组织转变成等轴组织;显微硬度的提高是因为Ti、Al、Nb扩散,造成α、α2尺寸小、弥散分布所致。
The microstructure and microhardness of Ti3Al / TC11 dual alloy near the isothermal deformation before and after the gradient heat treatment were studied. The results show that the microstructure of the heat-affected zone on the Ti3Al side changes little before and after the gradient heat treatment because the grain boundary α2 is relatively stable and the microstructure of the weld zone changes greatly. The reason is that the grain is broken due to the isothermal deformation And Ti, Al, Nb atoms diffuse, resulting in α, α2 each other checks and balances, resulting in continuous grain boundary α2 or grain boundary α; TC11 alloy matrix after gradient heat treatment from the basket into an equiaxed organization; microhardness The increase is because of Ti, Al, Nb diffusion, resulting in α, α2 small size, due to the dispersion.