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3D micromechanical interaction of thin-film retained austenite and lath martensite by computational plasticity
Citation Link: https://doi.org/10.15480/882.13724
Publikationstyp
Journal Article
Date Issued
2024-10-30
Sprache
English
Author(s)
Amiri, Mina
Kumpati, Joshua
TORE-DOI
Journal
Volume
256
Article Number
116434
Citation
Scripta Materialia 256: 116434 (2025)
Publisher DOI
Scopus ID
Publisher
Elsevier
To exploit the full potential of advanced high-strength steels (AHSS), a more in-depth understanding of the complex micromechanical interaction of thin-film retained austenite (RA) and lath martensite is indispensable. Inspired by the medium-Mn steel microstructure, a three-dimensional micromechanical modeling approach is therefore proposed in the present work, embedding the thin RA films explicitly into the hierarchical lath martensite structure. This enables systematic studies of the effect of RA film thickness and volume fraction on the local stresses and strains as well as their partitioning within the microstructure. The investigations reveal that with shrinking RA volume fraction, both stress and especially strain heterogeneity in the thin-film RA intensifies. In the martensite blocks, stress and strain heterogeneity also intensifies, although stresses are generally more heterogeneously, and strains much more homogeneously, distributed than in RA. The results underline the key role of RA with thin-film morphology for further optimizing AHSS microstructures.
Subjects
Advanced high-strength steels | Martensite | Micromechanics | Microstructure | Retained austenite
DDC Class
620.1: Engineering Mechanics and Materials Science
530: Physics
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Name
1-s2.0-S135964622400469X-main.pdf
Type
Main Article
Size
3.38 MB
Format
Adobe PDF