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Constitutive Modeling of the High-Temperature Flow Behavior of α-Ti Alloy Tube

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Abstract

In the hot metal gas forming process, the deformation conditions, such as temperature, strain rate and deformation degree, are often prominently changed. The understanding of the flow behavior of α-Ti seamless tubes over a relatively wide range of temperatures and strain rates is important. In this study, the stress–strain curves in the temperature range of 973-1123 K and the initial strain rate range of 0.0004-0.4 s−1 were measured by isothermal tensile tests to conduct a constitutive analysis and a deformation behavior analysis. The results show that the flow stress decreases with the decrease in the strain rate and the increase of the deformation temperature. The Fields–Backofen model and Fields–Backofen–Zhang model were used to describe the stress–strain curves. The Fields–Backofen–Zhang model shows better predictability on the flow stress than the Fields–Backofen model, but there exists a large deviation in the deformation condition of 0.4 s−1. A modified Fields–Backofen–Zhang model is proposed, in which a strain rate term is introduced. This modified Fields–Backofen–Zhang model gives a more accurate description of the flow stress variation under hot forming conditions with a higher strain rate up to 0.4 s−1. Accordingly, it is reasonable to adopt the modified Fields–Backofen–Zhang model for the hot forming process which is likely to reach a higher strain rate, such as 0.4 s−1.

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Acknowledgment

This study was financially supported by National Key R&D Program of China (2017YFB0304400, 2017YFB0306300), the National Natural Science Foundation of China (Nos. 51575131, 51405102), the program for Changjiang Scholars and Innovative Research Team in University (No. IRT1229). The authors would like to take this opportunity to express their sincere appreciation to the funds.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    Yanli Lin

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Yanli Lin, Kun Zhang, Zhubin He, Xiaobo Fan & Shijian Yuan

  3. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Zhubin He & Xiaobo Fan

  4. Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, 150001, China

    Yongda Yan

  5. Center For Precision Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Yongda Yan

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  1. Yanli Lin
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  2. Kun Zhang
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Correspondence to Kun Zhang.

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Lin, Y., Zhang, K., He, Z. et al. Constitutive Modeling of the High-Temperature Flow Behavior of α-Ti Alloy Tube. J. of Materi Eng and Perform 27, 2475–2483 (2018). https://doi.org/10.1007/s11665-018-3352-4

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  • DOI: https://doi.org/10.1007/s11665-018-3352-4

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