Hot forging characteristic of Ti-5Al-5V-5Mo-3Cr alloy with single metastable β microstructure

Hiroaki Matsumoto, Masami Kitamura, Yunping Li, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

Hot deformation characteristic of Ti-5Al-5V-5Mo-3Cr alloy with a starting microstructure of an equiaxed single β microstructure is examined in relation to microstructural evolution and the result according to processing map technique. In testing at 700. °C, subgrain formation is dominant at higher strain rate, while superplasticity occurs at lower strain rate. Herein, dynamic α precipitation from supersaturated β phase occurs during deformation and affects the flow behavior. In testing at and above 800. °C, dynamic recovery (DRV) is dominant and continuous dynamic recrystallization (CDRX) also occurs especially in the vicinity of boundaries of prior-β-grains. There are three domains having an optimized power dissipation efficiency (ranging from 40% to 50%) in processing map. These three domains are reasonably explained in relation to microstructural conversion of frequent activations of grain boundary sliding, dynamic recovery and simultaneous occurrence of dynamic recovery and continuous dynamic recrystallization.

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalMaterials Science and Engineering A
Volume611
DOIs
Publication statusPublished - 2014 Aug 12

Keywords

  • Dynamic recovery
  • Dynamic recrystallization
  • Hot deformation
  • Processing map
  • Titanium alloy

ASJC Scopus subject areas

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

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