Abstract: Effects of heat treatment process(annealing, solution treatment, solution and aging treatment and β heat treatment) on microstructure and mechanical properties of the self-produced hypoxic TC4-LC alloy and remelted TC4 alloy were studied by microstructure analysis and mechanical properties test. The results show that the oxygen content has a significant effect on mechanical properties of the alloy, and the mechanical properties depend on the microstructure under the same composition. The mechanical properties of the hypoxic TC4-LC alloy can be only improved to a certain extent by heat treatment processes, which can not meet the requirements of TC4 alloy. The strength of remelted TC4 alloy is greatly improved under different heat treatments, In addition to the annealing treatment, the plasticity is improved, for other heat treatments the plasticity is reduced to varying degrees and the mechanical properties of which after annealing treatment and solution and aging treatment can meet the requirements of TC4 titanium alloy.

Key words: hypoxic TC4-LC alloy, remelted TC4 titanium alloy, heat treatment, microstructure, mechanical properties