1.School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China
2.Key Laboratory of Rapid Development & Manufacturing Technology for Aircraft(Shenyang Aerospace University),Ministry of Education,Shenyang 110136,China
3.Shenyang Aircraft Design and Research Institute,Shenyang 110135,China
This paper investigates the high-temperature fatigue performance of TA15 titanium alloy laser-deposited repairs under different stress levels at 500 ℃ after heat treatment at various temperatures, analyzing the impact of microstructural evolution on fatigue life. The results show that when heat-treated at 900 ℃and 950 ℃, the content of the primary α phase in the base material decreases, the secondary α phase coarsens, and the microstructure in the heat-affected zone transitions from a transitional structure to a basket-weave structure. When the heat treatment temperature reaches 1 000 ℃, the α phase transforms into the high-temperature β phase, and recrystallization results in the formation of extremely fine β grains. Among the three heat treatment temperatures, the specimen treated at 1 000 ℃ exhibited the longest high-temperature fatigue life. Under high stress, the fatigue life of the specimens treated at 900 ℃ and 1 000 ℃ was comparable, while the specimen treated at 950 ℃ showed shorter high-temperature fatigue life under both high and low stress conditions compared to the other two groups. Fractographic analysis indicated that in the 1 000 ℃ specimen, fatigue cracks predominantly propagated through the α phase, consuming significant energy, which contributed to its longer high-temperature fatigue life compared to the other two heat treatment conditions.
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