Abstract:Microstructures morphology and phases of Ti-35V-15Cr-xSi-yC alloy after different annealing and solution treatments were studied using different analysis methods. The results show the amount of grain-boundary small grain increases but their sizes shows little change for the specimen annealing below 900℃. The microstructure morphology shows little different for different annealing specimen below 900℃.When the annealing temperature is above 900 ℃，the small grain at grain-boundary growth obviously and the microstructure morphology shows visible change. Tere are four precipitations in the alloy microstructure, they are spherical particle precipitation of Ti2C, “chicken feet” type precipitation of (TiV)C, dot particle precipitation of Ti5Si3 and needle-like precipitation of α. The solvus temperature for precipitation of (TiV)C and Ti5Si3 in Ti-35V-15Cr-xSi-yC are separately in temperature range form 950℃ to 1000℃ and 1000℃ to 1050℃. When the solution temperature increase to 1200℃，there is only partial solution of Ti2C.