Effect of post heat treatment on the microstructure and properties of as-annealed TC4 ELI alloy

Yin Yanchao; Sun Zhijie; Xue Da; Suo Yongyong; Liu Haibin

doi:10.7513/j.issn.1004-7638.2024.03.008

Volume 45 Issue 3

Jul. 2024

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Yin Yanchao, Sun Zhijie, Xue Da, Suo Yongyong, Liu Haibin. Effect of post heat treatment on the microstructure and properties of as-annealed TC4 ELI alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 55-64. doi: 10.7513/j.issn.1004-7638.2024.03.008

Citation:

Yin Yanchao, Sun Zhijie, Xue Da, Suo Yongyong, Liu Haibin. Effect of post heat treatment on the microstructure and properties of as-annealed TC4 ELI alloy[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 55-64. doi: 10.7513/j.issn.1004-7638.2024.03.008

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Effect of post heat treatment on the microstructure and properties of as-annealed TC4 ELI alloy

doi: 10.7513/j.issn.1004-7638.2024.03.008

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

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Received Date: 2023-11-21
Publish Date: 2024-07-02

Abstract

Abstract

The effects of post heat treatment on the microstructure and mechanical properties of annealed TC4 ELI alloy investigated by optical microscopy (OM), transmission electron microscopy (TEM), scanning electron microscopy (SEM), tensile and Charpy impact test at room temperature. The results show that the "bimodal → equiaxed" reverse transformation occurs in the annealed TC4 ELI alloy after aging at 520-720 ℃, and the strength increases first and then decreases. The impact toughness of the annealed TC4 ELI alloy decreases to the lowest value at 560 ℃, then increases slightly with the increase of temperature. The appearance of aging α phase is the main reason for the deterioration of impact toughness, while the precipitation of α₂ phase has little effect. The strength of TC4 ELI alloy aged at 620 ℃ increases slightly after high temperature treatment. When the temperature rises to the β phase region, the coarsening of the microstructure causes a sudden drop in yield strength, and the appearance of the α phase at the grain boundary causes a sudden drop in plasticity. After high temperature treatment, the aging α phase disappears, and the impact toughness is recovered to a greater extent.
- annealed TC4 ELI titanium alloy,
- post heat treatment,
- microstructure,
- strength,
- impact toughness

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References(32)

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