Loading...

Investigating the Effect of Hot Rolling of Ti-6Al-4V Alloy Containing Titanium Carbonitride Particles and Boron Addition on Microstructure Evolution and Mechanical Properties

Rastegari Qupaei, Habibollah | 2010

571 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41798 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ziaei Moayyed, Ali Akbar; Asgari, Sirus; Abbasi, Mehdi
  7. Abstract:
  8. In this thesis, two ingot of Ti-6Al-4V alloy containing titanium carbonitride particle, one with adding boron and the other without boron were fabricated by VIM furnace and using graphite crucible. Boron was added for the purpose of investigating its effect on microstructural evolution and mechanical properties. By Processing Casting ingots under TMP and heat treatment sequences, strips with 3 millimeter thickness were produced. In secondary rolling stage, rolling temperature was considered variable in alpha and alpha + beta phase field and its effect was studied on microstructural characteristics and mechanical properties. In as-rolled condition, it was found that increasing the rolling temperature over 870℃, leads to a reduction in strength, hardness and ductility, but after the final annealing process, strength and ductility will be recovered again. As a result of this dissertation, the best properties were obtained in rolling Temperature of 870℃. In annealed conditions, fracture mechanism was a mixture of cleavage and dimple mechanisms. In addition, adding boron led to a reduction in alpha grain size. Moreover, samples containing boron had lower strength and higher ductility compared with samples without boron. Finally, adding boron resulted in finer microstructure and higher ductility
  9. Keywords:
  10. Hot Deformation ; Mechanical Properties ; Titanium Alloy 6AL-4V ; Microstructural Changes ; Boron ; Heat Treatment

 Digital Object List

 Bookmark

No TOC