Microstructural characterization of hot deformed Ti-6A1-4V

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

The influence of the thermomechanical processing parameters on the microstructure is investigated in this work to define criteria to control and optimize of the forming processes. The mechanical properties of structural aircraft parts are strongly related to the microstructure obtained during forging and heat treatment processes, Pre-forged specimens of alpha-beta Ti-6A1-4V alloy with elongated primary α grains are deformed below and above the beta transus temperature between 0.001 and 10s-1 of strain rate. The local strain within the samples is determined by finite element methods and correlated to the microstructure. Compression in α+β field is carried out parallel and perpendicular to the preferential orientations of the primary α grains. The α content is affected by the temperature of deformation and the morphology of the α grains is influenced by the strain and strain rate. Specimens with previous primary α grains parallel to the compression axis show a rotation of the α grains perpendicular to the load axis, EBSD measurements are used to determine the restoration mechanism involved during hot deformation. At large strains, continuous dynamic recrystallization by lattice rotation in the α grains is revealed by increasing the cumulative crystallographic misorientation towards the grain boundary and the formation of new grains. This effect increases with increasing values of the Zener Hollomon parameter (Z), For lower values of Z restoration occurs mainly in the beta phase. During deformation in β field, the β grains become elongated with the strain where dynamic recovery is the main mechanism activated. Static recrystallization after deformation is quantified, and a larger amount of grains when strain rate increases, is observed.

Original languageEnglish
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages729-732
Number of pages4
Volume1
Publication statusPublished - 2012
EventTi-2011 - Peking, China
Duration: 18 Jun 201125 Jun 2011

Conference

ConferenceTi-2011
CountryChina
CityPeking
Period18/06/1125/06/11

Fingerprint

Strain rate
Microstructure
Restoration
Dynamic recrystallization
Hot working
Forging
Grain boundaries
Heat treatment
Aircraft
Finite element method
Recovery
Mechanical properties
Temperature
Processing

Keywords

  • Compression lest
  • Continuous dynamic recrystallization
  • EBSD
  • Hot deformation
  • Recrystallization
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Warchomicka, F., Poletti, M. C., & Stockinger, M. (2012). Microstructural characterization of hot deformed Ti-6A1-4V. In Ti 2011 - Proceedings of the 12th World Conference on Titanium (Vol. 1, pp. 729-732)

Microstructural characterization of hot deformed Ti-6A1-4V. / Warchomicka, F.; Poletti, Maria Cecilia; Stockinger, M.

Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 1 2012. p. 729-732.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Warchomicka, F, Poletti, MC & Stockinger, M 2012, Microstructural characterization of hot deformed Ti-6A1-4V. in Ti 2011 - Proceedings of the 12th World Conference on Titanium. vol. 1, pp. 729-732, Ti-2011, Peking, China, 18/06/11.
Warchomicka F, Poletti MC, Stockinger M. Microstructural characterization of hot deformed Ti-6A1-4V. In Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 1. 2012. p. 729-732
Warchomicka, F. ; Poletti, Maria Cecilia ; Stockinger, M. / Microstructural characterization of hot deformed Ti-6A1-4V. Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 1 2012. pp. 729-732
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