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Hot torsion behavior of SP-700 near beta titanium alloy in single and dual phase regions

  • Amir Hosein Sheikhali , Maryam Morakkabati and Seyed Mahdi Abbasi
Published/Copyright: November 29, 2018
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 109 Issue 12

Abstract

Hot deformation behavior of the SP-700 alloy is studied through continuous and interrupted hot torsion testing carried out at 850 and 1 000 °C at different pass-strains and inter-pass times. The flow curves of SP-700 alloy showed the discontinuous yield stress, which is followed by the steady state region. The dominant mechanism of softening in hot deformation at 1 000 °C was dynamic recrystallization (DRX), whereas at 850 °C serration and tanglement of the grain boundaries were observed. Nevertheless, the microstructure of the sample twisted at 850 °C indicated the occurrence of DRX and the formation of fine grains in the vicinity of grain boundaries and triple points by the bulging mechanism. With an increase in the pass-strain of interrupted torsion at 1 000 °C, due to the increase in driving force for nucleation and growth of new grains, the kinetics of static restoration increased. However, due to the completion of DRX, the kinetics rate of static restoration at steady state strain (∊s) was lower than that of the former state. The β → α phase transformation at 850 °C was found to be another factor contributing in fractional softening.

Keywords: SP-700 titanium alloy; Hot torsion test; Dynamic recrystallization; Fractional softening; Phase transformation
*Correspondence address, Dr Seyed Mahdi Abbasi, No. 15, Qaffar-nazari Alley, Heydary Avenue, Damavand Street, Tehran, Iran, Postal code: 1745953881, Tel.: +982177430446, Fax: +982177430446, E-mail:

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Received: 2018-03-28
Accepted: 2018-07-23
Published Online: 2018-11-29
Published in Print: 2018-12-10

© 2018, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111715
Keywords for this article
SP-700 titanium alloy; Hot torsion test; Dynamic recrystallization; Fractional softening; Phase transformation

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 1 – microstructure
  5. The influence of twinning on plastic constitutive description of a magnesium alloy
  6. Effect of V and Zr microalloying, and heat treatment on microstructure and mechanical properties of secondary Al-7Si-3Cu-0.3Mg alloy
  7. Effect of heat treatment on microstructure, hardening and plasticity of a commercial Al–Zn–Mg–Cu alloy
  8. Microstructural evolution and mechanical properties of thixoformed 7075 aluminum alloy prepared by conventional and new modified SIMA processes
  9. Hot torsion behavior of SP-700 near beta titanium alloy in single and dual phase regions
  10. Effect of B4C in Ti-6Al-4V matrix on workability behavior of powder metallurgy composites during cold upsetting
  11. Synthesis of Ni/YSZ based anode and investigation of effect of PVA as pore-former upon porosity, microstructure and thermal behavior for potential use in solid oxide fuel cells (SOFCs)
  12. The corrosion behavior of porous Ni–Cr–Fe alloy in 2 mol L−1 alkaline solution
  13. Short Communications
  14. The grain growth in alumina compacts sintered under high pressure
  15. DGM News
  16. DGM News
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