A Multi Scale Strategy for Simulation of Microstructural Evolutions in Friction Stir Welding of Duplex Titanium Alloy

A fully coupled thermo-mechanical model is established to simulate the temperature variations and the material deformations in friction stir welding (FSW) of Ti-6Al-4V. The extracted data are used for further simulation on microstructural evolutions. A multi scale model, which consists of the grain...

Full description

Saved in:
Bibliographic Details
Published in:High temperature materials and processes 2019-02, Vol.38 (2019), p.485-497
Main Authors: Zhang, Z., Tan, Z. J.
Format: Article
Language:English
Subjects:
acicular grain
Beta phase
Computer simulation
Cooling rate
duplex alloy
Friction stir welding
Grain boundaries
Grain growth
Heat treating
Monte Carlo method
Phase transitions
recrystallization
Rotation
Scale models
Substrates
Titanium alloys
Titanium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A fully coupled thermo-mechanical model is established to simulate the temperature variations and the material deformations in friction stir welding (FSW) of Ti-6Al-4V. The extracted data are used for further simulation on microstructural evolutions. A multi scale model, which consists of the grain growth model in grain cluster scale and the phase transformation model in one grain scale, is proposed. The nuclei of and phases, the recrystallizations and the grain growths are systematically investigated. Comparisons with experimental data and experimental observations can validate the newly proposed microstructural evolution model for Ti-6Al-4V. Results indicate that the volume fractions of and phases can be directly determined by the cooling rates in FSW process. With the increase of the rotating speed, the volume fraction of phase is increased and phase decreased due to the increase of welding temperature. With the decrease of the translational speed, the volume fraction of phase gets bigger and phase smaller. The acicular grain can be generated on the grain boundaries and grows along direction on substrate. The average length of grain can be increased with longer cooling time and decreased with lower rotating speed or higher translational speed.
ISSN:0334-6455
2191-0324
DOI:10.1515/htmp-2018-0148