A dislocation density-based model for the work hardening and softening behaviors upon stress reversal

• Autorzy: Lisiecka-Graca Paulina , Bzowski Krzysztof , Majta Janusz , Muszka Krzysztof

Identyfikatory

DOI

10.1007/s43452-021-00239-x

• Języki publikacji: EN

Abstrakty

EN

The mechanical behaviours of microalloyed and low-carbon steels under strain reversal were modelled based on the average dislocation density taking into account its allocation between the cell walls and cell interiors. The proposed model reflects the effects of the dislocations displacement, generation of new dislocations and their annihilation during the metal-forming processes. The back stress is assumed as one of the internal variables. The value of the initial dislocation density was calculated using two different computational methods, i.e. the first one based on the dislocation density tensor and the second one based on the strain gradient model. The proposed methods of calculating the dislocation density were subjected to a comparative analysis. For the microstructural analysis, the high-resolution electron backscatter diffraction (EBSD) microscopy was utilized. The calculation results were compared with the results of forward/reverse torsion tests. As a result, good effectiveness of the applied computational methodology was demonstrated. Finally, the analysis of dislocation distributions as an effect of the strain path change was performed.

Słowa kluczowe

EN

dislocation density-based model; geometrically necessary dislocation; strain path change; electron backscatter diffraction

PL

stal mikrostopowa; odkształcenie; stal niskowęglowa

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2021
• Tom: Vol. 21, no. 2
• Strony: 721--731
• Opis fizyczny: Bibliogr. 26 poz., rys., wykr.

Twórcy

autor

Lisiecka-Graca Paulina

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

• https://orcid.org/0000-0002-7861-6847

autor

Bzowski Krzysztof

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

• https://orcid.org/0000-0002-1784-2584

autor

Majta Janusz

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

• https://orcid.org/0000-0001-8603-6677

autor

Muszka Krzysztof

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland

• https://orcid.org/0000-0001-8449-7795

Bibliografia

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