Abstract
The engine is one of the core components of aircraft, and the demand of mechanical properties of its raw materials is higher. The microstructure and properties of the raw materials could be improved by optimizing heat treatment systems. In this paper, the effects of annealing and solution aging on tensile properties of TC4 bar were compared, and the effect of solution temperature on microstructure and tensile properties of bar were studied. The results show that compared with annealing treatment, the tensile strength of bar is improved by 80MPa after solution aging treatment. And with the increase of solution temperature, the content of primary α phase is decreased, the content of secondary α phase is increased, the tensile strength is increased, and the maximum value reaches 1093MPa. Finally, it is determined that the heat treatment system of bar is ℃， ℃， 965 /1h WQ+720 /2h AC.
Highlights
IntroductionIt has excellent comprehensive mechanical properties, excellent thermal process plasticity and good weldability [1,2]
TC4 titanium alloy is a kind of α-β two-phase titanium alloy, which contains 6%Al and 4% V
TC4 titanium alloy is mainly used in fan disc, compressor disc and casing of airplane engine, and engine is the core component of aircraft, and the service environment is worse [4]
Summary
It has excellent comprehensive mechanical properties, excellent thermal process plasticity and good weldability [1,2]. It can be used for a long time at 400 °C, and its cost is relatively low. It is widely used in aerospace industry, such as blades, discs, casing of airplane engine fans and compressors, beams, joints and diaphragms in aircraft structures[3]. Room temperature tensile specimens were prepared on the specimens for mechanical properties testing. The corrosion solution of metallographic samples was 10% HF + 30% HNO3 + 60% H2O
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