A continuous dynamic recrystallization model to describe the hot deformation behaviour of a Ti5553 alloy

R. H. Buzolin, F. Krumphals, M. Lasnik, A. Krumphals, M. C. Poletti

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

Abstract

A physical based model is developed to describe recrystallization phenomena of titanium alloys during hot working of the β phase. Continuous dynamic recrystallization is attributed as the restoration mechanism based on the progressive transformation of low angle boundaries (subgrains) into high angle boundaries (grains). The model describes both, the microstructure, and the flow stress evolutions during hot deformation with large strains. The microstructure is conceived as been formed by three different populations of dislocations, and high as well as low angle grain boundaries. Evolution rates of all microstructural features are determined based on the effects of generation, interaction and annihilation of dislocations during deformation due to dynamic recovery, continuous dynamic recrystallization and static recovery. Continuous dynamic recrystallization is modelled and is considered to occur homogeneously within the microstructure. The model is able to predict the formation of subgrains from a fully annealed microstructure and the progressive formation of high angle grain boundaries. The subgrain and grain sizes are also obtained as output of the model. The model was applied to describe the hot compression behaviour of a Ti5553 alloy deformed between 880°C to 920°C and strain rates from 0.001 s-1 up to 10 s-1. The model is validated with flow curves and microstructural characterisation of hot deformed, and with microstructural information of non-deformed samples. The critical strain rate increases with increasing strain rate and decreasing temperature, similar to the discontinuous dynamic recrystallization phenomenon. The model can be implemented to simulate the microstructure and predict flow stresses of titanium alloys in industrial processes.

Originalspracheenglisch
Aufsatznummer012048
FachzeitschriftJournal of Physics: Conference Series
Jahrgang1270
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 14 Aug 2019
Veranstaltung7th International Conference on Recrystallization and Grain Growth, ReX and GG 2019 - Ghent, Belgien
Dauer: 4 Aug 20199 Aug 2019

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microstructure
strain rate
grain boundaries
titanium alloys
recovery
hot working
restoration
grain size
output
curves
interactions
temperature

ASJC Scopus subject areas

  • !!Physics and Astronomy(all)

Fields of Expertise

  • Advanced Materials Science

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A continuous dynamic recrystallization model to describe the hot deformation behaviour of a Ti5553 alloy. / Buzolin, R. H.; Krumphals, F.; Lasnik, M.; Krumphals, A.; Poletti, M. C.

in: Journal of Physics: Conference Series, Jahrgang 1270, Nr. 1, 012048, 14.08.2019.

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

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