Effect of post heat treatment on the microstructure and properties of as-annealed Ti75 alloy

Yin Yanchao; Li Longteng; Lü Yifan; Sun Zhijie; Yu Wei; Jiang Peng

doi:10.7513/j.issn.1004-7638.2023.05.011

Volume 44 Issue 5

Oct. 2023

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Yin Yanchao, Li Longteng, Lü Yifan, Sun Zhijie, Yu Wei, Jiang Peng. Effect of post heat treatment on the microstructure and properties of as-annealed Ti75 alloy[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 68-75. doi: 10.7513/j.issn.1004-7638.2023.05.011

Citation:

Yin Yanchao, Li Longteng, Lü Yifan, Sun Zhijie, Yu Wei, Jiang Peng. Effect of post heat treatment on the microstructure and properties of as-annealed Ti75 alloy[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 68-75. doi: 10.7513/j.issn.1004-7638.2023.05.011

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Effect of post heat treatment on the microstructure and properties of as-annealed Ti75 alloy

doi: 10.7513/j.issn.1004-7638.2023.05.011

Luoyang Ship Material Research Institute, Luoyang 471023, Henan, China

Received Date: 2023-03-07
Available Online: 2023-11-04
Publish Date: 2023-10-31

Abstract

Abstract

In order to study the effect of post heat treatment on the properties of annealed Ti75 alloy, different post treatment conditions including annealing temperatures and cooling rates were selected to treat the annealed Ti75 alloy. The microstructure evolution was analyzed by OM and SEM, and the influence of microstructure on tensile properties and impact toughness of Ti75 alloy was studied. The results show that the volume fraction of equiaxed α phase has no obvious change when alloy is annealed at low temperature. When the annealing temperature is high enough, the equiaxed α phase begins to dissolve and its volume fraction decreases gradually with the increase of temperature. The evolution of strength and impact toughness of annealed Ti75 alloy after air cooling by different annealing temperature at 750 - 950 ℃ is basically the same as that of furnace cooling. The yield strength and tensile strength decrease firstly, then increase a little and then decrease again with the increase of temperature. The main reason for strength increasing is that a large number of fine α phases exists in the β transformation matrix structure which are difficult to deform. The impact toughness has no obvious change when alloy is annealed at low temperature region and then increases with the increase of temperature. The strength of annealed Ti75 alloy after annealing and air cooling is higher than that of furnace cooling. The impact toughness of annealed Ti75 alloy after annealing at low temperature region and air cooling is higher than that of furnace cooling, while at the high temperature region it shows the opposite changing tendency.
- as-annealed Ti75 alloy,
- post heat treatment,
- microstructure,
- strength,
- impact toughness

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References(29)

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