Microstructure evolution and deformation texture during rolling of TIMETAL 407

Gaurav Singh, J. Quinta da Fonseca, M. Preuss

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Abstract

TIMETAL 407 is a new titanium alloy primarily developed for combining high formability with improved strength compared to commercially pure titanium. In this study, the evolution of microstructure, spherodization behavior of α laths, macro and micro textures during rolling of TIMETAL 407 are examined. For this purpose, TIMETAL 407 with transformed β microstructure was rolled at 650 and 820 °C to 50 and 75% reduction ratios followed by recrystallization heat treatment at 820 °C. The material was characterized focusing on microstructure morphology and texture evolution. The material rolled at 650 °C displayed strong basal pole concentrations towards the normal direction (ND)/30° towards transverse direction (TD) together with a weak transverse component. When the material was rolled at higher temperature 820 °C, the texture only showed a weak transverse type texture. Complete spherodization of the α laths occurred only when the material was rolled to 75% reduction at 650 °C. At other rolling temperature and reduction ratios, the extent of spherodization per se was limited. Our results clearly show that activation of deformation twinning in the material rolled at 650 °C to 75% reduction played a key role in the break-up of α laths and significant texture change involving formation of strong 30° basal texture component. The spherodization behavior of α laths in TIMETAL 407 is compared with Ti-6Al-4V rolled to equivalent temperatures relative to the β-transus based on classical boundary splitting and termination migration mechanisms.

Original languageEnglish
Article number100596
Number of pages15
JournalMaterialia
Volume9
DOIs
Publication statusPublished - Mar 2020
Externally publishedYes

Keywords

  • Annealing
  • Rolling
  • Spherodization
  • Texture
  • Thermo-mechanical processing
  • Titanium alloys

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