Effect of pre-deformation heat treatment on deformation behavior of near-a Ti-Fe alloy in (α+β) two-phase region

Behrang Poorganji, Makoto Yamaguchi, Yoshio Itsumi, Katsushi Matsumoto, Tomofumi Tanaka, Yusuke Asa, Goro Miyamoto, Tadashi Furuhara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Numbers of studies on hot deformation of α+β titanium alloys, especially Ti-6AI-4V and near α alloys in (α+β) two-phase region were carried out. However, effects of initial microstructure on the deformed microstructure have not been studied well. In this study, deformation behavior and microstructure evolution of a Ti-1.5Fe alloy in (α+β) two-phase region is studied with focusing on effect of initial microstructure at different deformation temperatures and strain rates. Two different prc-deformation heat treatments were used to achieve different initial microstructure. One is quenching to room temperature after fi solutionizing at 1173K for 1.2ks and reheating to the deformation temperature providing a fine intcrlamcllar spacing and colony size in the (α+β) lamellar microstructure. The other is direct cooling to the deformation temperature after (J solutionizing resulting in a coarser lamellar structure. Hot deformation was conducted at 1108, 1073 and 948K, where corresponding equilibrium volume fractions of a phase are 15, 50 and 85%, respectively, by uniaxial compression by 50% at various initial strain rates ranged from 1 to 10-4-1. Decrease in both intcrlamcllar spacing and colony size of initial microstructure results in promotion of dynamic reciystallization (DRX) at a given deformation condition. By increasing strain rate grain size of the rccrystallizcd a is dccrcascd. It is concludcd that critical strain needed for initiation and completion of DRX is decreased by refining the initial microstructure. Also, it is proposed that DRX of lamellar a phase is a continuous type.

Original languageEnglish
Title of host publicationProceedings of the 17th IFHTSE Congress
PublisherThe Japan Society for Heat Treatment (JSHT)
Pages812-815
Number of pages4
ISBN (Electronic)9780000000002
Publication statusPublished - 2008 Jan 1
Event17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
Duration: 2008 Oct 262008 Oct 28

Publication series

NameProceedings of the 17th IFHTSE Congress
Volume2

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
CountryJapan
CityKobe
Period08/10/2608/10/28

Keywords

  • Dynamic reciystallization
  • Grain refining
  • Hot deformation
  • Near-a titanium alloys

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

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  • Cite this

    Poorganji, B., Yamaguchi, M., Itsumi, Y., Matsumoto, K., Tanaka, T., Asa, Y., Miyamoto, G., & Furuhara, T. (2008). Effect of pre-deformation heat treatment on deformation behavior of near-a Ti-Fe alloy in (α+β) two-phase region. In Proceedings of the 17th IFHTSE Congress (pp. 812-815). (Proceedings of the 17th IFHTSE Congress; Vol. 2). The Japan Society for Heat Treatment (JSHT).