Behavior modeling and microstructural evolutions of Ti-6Al-4V alloy under hot forming conditions

V. Velay, H. Matsumoto, V. Vidal, A. Chiba

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Ti-6Al-4V alloy is widely used in superplastic forming process. The conventional conditions require high forming temperatures (T≥900°C) and low strain rates (ε≤10-3s-1). In order to reduce the costs of the industrial process, recent investigations focus on the micro-structural refinement of the material. It allows an improvement of the forming conditions which makes lower forming temperatures and higher strain rates eligible whereas low strain rates (ε≤10-3s-1) and high temperatures (T≥800°C) are particularly suitable for conventional superplastic forming conditions. However, the mechanical response of the Titanium alloy strongly depends on the starting micro-structure considered and on its evolution with the temperature and the deformation. The objective of the present investigation is to observe the micro-structural evolutions of Ti-6Al-4V alloy under thermal and mechanical loadings from different starting micro-structures. Hence, an internal grain growth variable is identified by the use of these observations. Then, it is introduced into the behavior model and its influence on the mechanical response of the material is analyzed. The final constitutive equations are able to take into account viscosity, strain hardening and grain size evolution for a wide range of strain rates and forming temperatures (10-4s-1≤ε≤10-2s-1;650°C≤T≤870°C). Moreover, the model is able to consider several starting microstructures (different initial grain sizes) and to predict their influence on the viscous flow and the strain hardening. At last, some model verifications are conducted to check the validity of the non-isothermal model formulation. Some predictions are also performed by considering several starting microstructures.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalInternational Journal of Mechanical Sciences
Volume108-109
DOIs
Publication statusPublished - 2016 Apr

Keywords

  • Behavior modeling
  • Hot and superplastic forming conditions
  • Mechanical testing
  • Micro-structural evolutions
  • Ti-6Al-4V alloy
  • Viscoplastic material

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Behavior modeling and microstructural evolutions of Ti-6Al-4V alloy under hot forming conditions'. Together they form a unique fingerprint.

Cite this