Effect of wall thickness and casting defects on microstructure and properties of ZTA15 titanium alloy

Han Yunfei; Yuan Bingbing; Sun Bing; Liu Yihui; Qiao Haibin; Li Bobo

doi:10.7513/j.issn.1004-7638.2022.06.013

Volume 43 Issue 6

Jan. 2023

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Han Yunfei, Yuan Bingbing, Sun Bing, Liu Yihui, Qiao Haibin, Li Bobo. Effect of wall thickness and casting defects on microstructure and properties of ZTA15 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 84-88. doi: 10.7513/j.issn.1004-7638.2022.06.013

Citation:

Han Yunfei, Yuan Bingbing, Sun Bing, Liu Yihui, Qiao Haibin, Li Bobo. Effect of wall thickness and casting defects on microstructure and properties of ZTA15 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 84-88. doi: 10.7513/j.issn.1004-7638.2022.06.013

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Effect of wall thickness and casting defects on microstructure and properties of ZTA15 titanium alloy

doi: 10.7513/j.issn.1004-7638.2022.06.013

Han Yunfei^{1, 2
,},
Yuan Bingbing^{1, 2},
Sun Bing^{1, 2},
Liu Yihui^{1, 2},
Qiao Haibin^{1, 2},
Li Bobo^{1, 2}

1.
Luoyang Sunrui Titanium Precision Casting Co., Ltd., Luoyang 471000, Henan, China
2.
Luoyang Ship Material Research Institute, Luoyang 471000, Henan, China

Received Date: 2022-07-11
Publish Date: 2023-01-13

Abstract

Abstract

In this paper, cylindrical and dumbbell shaped ZTA15 titanium alloy test bars (as cast) were prepared by investment casting technology, and then treated by hot isostatic pressing (HIP). The effects of wall thickness and casting defects on the microstructure and properties of ZTA15 titanium alloy were studied by means of room temperature tensile test, microstructure observation, grain size evaluation, X-ray flaw detection, scanning electron microscope (SEM) and energy spectrum analysis. The results show that as-cast ZTA15 titanium alloy has residual stress and shrinkage casting defects, which affect its mechanical properties and are detrimental to its engineering application. The wall thickness affects the mechanical properties of ZTA15 titanium alloy. The grain size at the thin wall position is finer, but the as-cast residual stress is larger, leading to the lower mechanical properties. After hot isostatic pressing, the residual stress is eliminated, and the mechanical properties are slightly improved, which enable the alloy at better use state. The shrinkage defects are compacted and closed after hot isostatic pressing, and the dense and uniform structure is formed by diffusion bonding, which improves the mechanical properties, and the data distribution is centralized. Inclusion defects are detrimental to the mechanical properties of ZTA15 titanium alloy, especially the plasticity.
- ZTA15 titanium alloy,
- investment casting,
- wall thickness,
- casting defect,
- microstructure,
- mechanical property,
- grain size

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References(9)

References

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