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Open AccessArticle

Lath Martensite Microstructure Modeling: A High-Resolution Crystal Plasticity Simulation Study

1
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
2
Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, 3001 Leuven, Belgium
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Department of Computer Science, KU Leuven, Celestijnenlaan 200A, 3001 Leuven, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Frank Czerwinski
Materials 2021, 14(3), 691; https://doi.org/10.3390/ma14030691
Received: 11 December 2020 / Revised: 15 January 2021 / Accepted: 25 January 2021 / Published: 2 February 2021
(This article belongs to the Special Issue Micromechanics: Experiment, Modeling and Theory)
Lath martensite is a complex hierarchical compound structure that forms during rapid cooling of carbon steels from the austenitic phase. At the smallest, i.e., ‘single crystal’ scale, individual, elongated domains, form the elemental microstructural building blocks: the name-giving laths. Several laths of nearly identical crystallographic orientation are grouped together to blocks, in which–depending on the exact material characteristics–clearly distinguishable subblocks might be observed. Several blocks with the same habit plane together form a packet of which typically three to four together finally make up the former parent austenitic grain. Here, a fully parametrized approach is presented which converts an austenitic polycrystal representation into martensitic microstructures incorporating all these details. Two-dimensional (2D) and three-dimensional (3D) Representative Volume Elements (RVEs) are generated based on prior austenite microstructure reconstructed from a 2D experimental martensitic microstructure. The RVEs are used for high-resolution crystal plasticity simulations with a fast spectral method-based solver and a phenomenological constitutive description. The comparison of the results obtained from the 2D experimental microstructure and the 2D RVEs reveals a high quantitative agreement. The stress and strain distributions and their characteristics change significantly if 3D microstructures are used. Further simulations are conducted to systematically investigate the influence of microstructural parameters, such as lath aspect ratio, lath volume, subblock thickness, orientation scatter, and prior austenitic grain shape on the global and local mechanical behavior. These microstructural features happen to change the local mechanical behavior, whereas the average stress–strain response is not significantly altered. Correlations between the microstructure and the plastic behavior are established. View Full-Text
Keywords: packet; block; subblock; lath; steel packet; block; subblock; lath; steel
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MDPI and ACS Style

Gallardo-Basile, F.-J.; Naunheim, Y.; Roters, F.; Diehl, M. Lath Martensite Microstructure Modeling: A High-Resolution Crystal Plasticity Simulation Study. Materials 2021, 14, 691. https://doi.org/10.3390/ma14030691

AMA Style

Gallardo-Basile F-J, Naunheim Y, Roters F, Diehl M. Lath Martensite Microstructure Modeling: A High-Resolution Crystal Plasticity Simulation Study. Materials. 2021; 14(3):691. https://doi.org/10.3390/ma14030691

Chicago/Turabian Style

Gallardo-Basile, Francisco-José; Naunheim, Yannick; Roters, Franz; Diehl, Martin. 2021. "Lath Martensite Microstructure Modeling: A High-Resolution Crystal Plasticity Simulation Study" Materials 14, no. 3: 691. https://doi.org/10.3390/ma14030691

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