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

• Published in: Metals (Basel ) Vol. 10; no. 9; p. 1122
• Main Authors: Muszka, Krzysztof, Zych, Dawid, Lisiecka-Graca, Paulina, Madej, Lukasz, Majta, Janusz
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2020
• 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; United States > US
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met10091122

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).