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研究了经开坯锻造的Ti-22Al-24Nb合金在不同固溶温度下的显微组织变化规律。结果显示:开坯锻造后Ti-22Al-24Nb合金的显微组织为等轴三相(α_2+B2+O)组织。随固溶温度的升高,初生板条状O相和等轴α_2相转变为B2基体相,B2相的体积分数逐渐增大。当固溶温度为1000℃时,B2相发生再结晶,出现了细小晶粒组织。固溶温度升高到1040℃时,晶粒明显长大,达200μm左右,且未溶解的初生α_2/O相也有所长大。油冷过程中,由于再结晶时间充分,晶粒变大。
The microstructure of the as-cast Ti-22Al-24Nb alloy at different solution temperatures was investigated. The results show that the microstructure of Ti-22Al-24Nb alloy after billet forging is equiaxed three-phase (α_2 + B2 + O). With the increase of solution temperature, the primary lamellar O phase and the equiaxed α_2 phase transform into the B2 matrix phase, and the volume fraction of B2 phase increases gradually. When the solution temperature is 1000 ℃, the B2 phase recrystallizes and a fine grain structure appears. When the solution temperature increases to 1040 ℃, the grain grows up to about 200μm, and the undissolved primary α_2 / O phase also grows. Oil cooling process, due to the recrystallization time is full, the grain becomes larger.