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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00539463" target="_blank" >RIV/61389005:_____/21:00539463 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.msea.2020.140268" target="_blank" >https://doi.org/10.1016/j.msea.2020.140268</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2020.140268" target="_blank" >10.1016/j.msea.2020.140268</a>

Result language

angličtina

Original language name

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

Original language description

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 13field 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 13 -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 13 -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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials Science and Engineering A Structural Materials Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Volume of the periodical

800

Issue of the periodical within the volume

JAN

Country of publishing house

CH - SWITZERLAND

Number of pages

19

Pages from-to

140268

UT code for WoS article

000593928600001

EID of the result in the Scopus database

2-s2.0-85091656965