Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

Xiaoning Han; Junzhou Yang; Jinshan Li; Jianjun Wu

doi:10.3390/cryst12020294

Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

Xiaoning Han, Junzhou Yang, Jinshan Li, Jianjun Wu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming (SPF) has been discussed. In high-temperature constant strain rate tensile tests, the selected temperatures were 930, 900, 800, 700, and 600 °C, and the initial strain rates were 10⁻², 10⁻³, and 10⁻⁴/s. The optimized deformation temperatures were 800~900 °C and the strain rates were 10⁻⁴~10⁻³/s. Then, the evolutions of activation energy and deformation strain are also discussed, and the effects of dislocation density and deformation activation energy on flow behavior were consistent. In addition, unstable flow is mainly concentrated in the low-temperature and high strain-rate regions, and this is mainly caused by dynamic recrystallization (DRX). After the SPF process, the possibility of material damage gradually increases during the air-cooling process.

Original language	English
Article number	294
Journal	Crystals
Volume	12
Issue number	2
DOIs	https://doi.org/10.3390/cryst12020294
State	Published - Feb 2022

Keywords

Air cooling
Flow behavior
Superplastic forming
Ti-6Al-4V

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10.3390/cryst12020294

Cite this

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title = "Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming",

abstract = "The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming (SPF) has been discussed. In high-temperature constant strain rate tensile tests, the selected temperatures were 930, 900, 800, 700, and 600 °C, and the initial strain rates were 10−2, 10−3, and 10−4/s. The optimized deformation temperatures were 800~900 °C and the strain rates were 10−4~10−3/s. Then, the evolutions of activation energy and deformation strain are also discussed, and the effects of dislocation density and deformation activation energy on flow behavior were consistent. In addition, unstable flow is mainly concentrated in the low-temperature and high strain-rate regions, and this is mainly caused by dynamic recrystallization (DRX). After the SPF process, the possibility of material damage gradually increases during the air-cooling process.",

keywords = "Air cooling, Flow behavior, Superplastic forming, Ti-6Al-4V",

author = "Xiaoning Han and Junzhou Yang and Jinshan Li and Jianjun Wu",

note = "Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = feb,

doi = "10.3390/cryst12020294",

language = "英语",

volume = "12",

journal = "Crystals",

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TY - JOUR

T1 - Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

AU - Han, Xiaoning

AU - Yang, Junzhou

AU - Li, Jinshan

AU - Wu, Jianjun

PY - 2022/2

Y1 - 2022/2

N2 - The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming (SPF) has been discussed. In high-temperature constant strain rate tensile tests, the selected temperatures were 930, 900, 800, 700, and 600 °C, and the initial strain rates were 10−2, 10−3, and 10−4/s. The optimized deformation temperatures were 800~900 °C and the strain rates were 10−4~10−3/s. Then, the evolutions of activation energy and deformation strain are also discussed, and the effects of dislocation density and deformation activation energy on flow behavior were consistent. In addition, unstable flow is mainly concentrated in the low-temperature and high strain-rate regions, and this is mainly caused by dynamic recrystallization (DRX). After the SPF process, the possibility of material damage gradually increases during the air-cooling process.

AB - The flow behavior of Ti-6Al-4V alloy during the air-cooling process after superplastic forming (SPF) has been discussed. In high-temperature constant strain rate tensile tests, the selected temperatures were 930, 900, 800, 700, and 600 °C, and the initial strain rates were 10−2, 10−3, and 10−4/s. The optimized deformation temperatures were 800~900 °C and the strain rates were 10−4~10−3/s. Then, the evolutions of activation energy and deformation strain are also discussed, and the effects of dislocation density and deformation activation energy on flow behavior were consistent. In addition, unstable flow is mainly concentrated in the low-temperature and high strain-rate regions, and this is mainly caused by dynamic recrystallization (DRX). After the SPF process, the possibility of material damage gradually increases during the air-cooling process.

KW - Air cooling

KW - Flow behavior

KW - Superplastic forming

KW - Ti-6Al-4V

UR - http://www.scopus.com/inward/record.url?scp=85125105215&partnerID=8YFLogxK

U2 - 10.3390/cryst12020294

DO - 10.3390/cryst12020294

M3 - 文章

AN - SCOPUS:85125105215

SN - 2073-4352

VL - 12

JO - Crystals

JF - Crystals

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ER -

Investigation of the Flow Behavior of Air-Cooling Ti-6Al-4V Alloy after Superplastic Forming

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