Experimental and Molecular Dynamic Study of Grain Refinement and Dislocation Substructure Evolution in HSLA and IF Steels after Severe Plastic Deformation

In this study, large-scale molecular dynamic simulations were performed to analyze the dislocation substructure interaction with various types of obstacles present in microalloyed steels during severe plastic deformation. Specifically, fully functional numerical models of the atomic upsetting test w...

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Bibliographic Details
Published in:Metals (Basel ) 2020-09, Vol.10 (9), p.1122
Main Authors: Muszka, Krzysztof, Zych, Dawid, Lisiecka-Graca, Paulina, Madej, Lukasz, Majta, Janusz
Format: Article
Language:English
Subjects:
Computer simulation
Deformation
Deformation effects
Electron backscatter diffraction
Grain boundaries
Grain refinement
Grain size
High strength low alloy steels
interstitial free steel
Mechanical properties
microalloyed steel
Microalloying
Microstructure
molecular dynamic simulation
Molecular dynamics
Multiaxis
Numerical models
Plastic deformation
Precipitates
Precipitation hardening
Recrystallization
Scanning electron microscopy
severe plastic deformation
Steel
Substructures
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Summary:In this study, large-scale molecular dynamic simulations were performed to analyze the dislocation substructure interaction with various types of obstacles present in microalloyed steels during severe plastic deformation. Specifically, fully functional numerical models of the atomic upsetting test were developed, with particular emphasis on the presence of precipitates inside the microstructure grains. The obtained results compared with the microstructural tests, performed using Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscope (TEM) techniques, allowed for a more accurate assessment of the microstructure refinement mechanisms by means of the in-situ recrystallization effect in the deformed samples subjected to the multi-axis compression using the MaxStrain system (Dynamic Systems Inc., New York, NY, USA).
ISSN:2075-4701
2075-4701
DOI:10.3390/met10091122