Refinement of the Ti-17 microstructure after hot deformation: Coupled mesoscale model

Ricardo Henrique Buzolin*, David Canelo Yubero, Fernando Gustavo Warchomicka, Michael Lasnik, Alfred Krumphals, M. C. Poletti

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The thermo-mechanical processing of Ti-alloys comprises several steps where complex deformation and temperature cycles are achieved. In this work, the static recrystallization behaviour of a Ti-17 alloy is investigated using ex-situ characterization and in-situ synchrotron radiation experiments aiming to understand the operating mechanisms and to establish the recrystallization kinetics. Hot compression in the β- field for different strain rates is applied to provide different initial microstructures before isothermal heat treatments and continuous cooling. Strain induced boundary migration is the main operating nucleation mechanism during static recrystallization. A simple mesoscale model is proposed to couple the evolution of the microstructure during hot deformation followed by annealing considering the heterogeneity of deformation within the β-grains, for the nucleation and growth of grains and the formation of the substructure by static recovery. Electron backscattered diffraction measurements are used after isothermal annealing and continuous cooling treatments to validate the model. A strong influence of the localization of deformation in the vicinity of the prior β-high angle grain boundaries is observed and empirically implemented in the mesoscale model. The strong influence of the temperature is attributed to the difference in high angle grain boundary mobility during static recrystallization. Grain refinement is not successfully achieved up to the investigated strain due to the insufficient nucleation rate with respect to the growth rate. However, a homogenous recrystallized microstructure is observed. The model can predict the microstructure for any starting microstructure, even beyond the experimental validation.
Original languageEnglish
Article number140268
Number of pages19
JournalMaterials Science and Engineering / A
Volume800
DOIs
Publication statusPublished - 7 Jan 2021

Keywords

  • Static recrystallization
  • Strain induced boundary migration
  • Titanium alloys
  • Mesoscale modelling
  • Nucleation
  • Grain growth
  • Static recovery
  • In-situ high energy X-ray diffraction
  • Ti-17
  • In-situ synchrotron X-Ray diffraction

ASJC Scopus subject areas

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

Fields of Expertise

  • Advanced Materials Science

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