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

  • Yanli Lin
  • Kun Zhang
  • Zhubin He
  • Xiaobo Fan
  • Yongda Yan
  • Shijian Yuan
Article
  • 109 Downloads

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.

Keywords

constitutive model Fields–Backofen model flow behavior hot metal gas forming statistical analysis α-Ti seamless tube 

Notes

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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Copyright information

© ASM International 2018

Authors and Affiliations

  • Yanli Lin
    • 1
    • 2
  • Kun Zhang
    • 2
  • Zhubin He
    • 2
    • 3
  • Xiaobo Fan
    • 2
    • 3
  • Yongda Yan
    • 4
    • 5
  • Shijian Yuan
    • 2
  1. 1.School of Materials Science and EngineeringHarbin Institute of Technology at WeihaiWeihaiChina
  2. 2.School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina
  3. 3.School of Mechanical EngineeringDalian University of TechnologyDalianChina
  4. 4.Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of EducationHarbin Institute of TechnologyHarbinChina
  5. 5.Center For Precision EngineeringHarbin Institute of TechnologyHarbinChina

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