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

Francisco-José Gallardo-Basile1, Yannick Naunheim2, Franz Roters1

  • 1Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany.

Materials (Basel, Switzerland)
|February 5, 2021
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Summary
This summary is machine-generated.

This study presents a parametrized approach to model lath martensite microstructures, crucial for understanding carbon steel properties. Simulations reveal that while microstructural details impact local behavior, the overall stress-strain response remains consistent.

Keywords:
blocklathpacketsteelsubblock

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Materials Engineering

Background:

  • Lath martensite in carbon steels exhibits a complex hierarchical structure, with laths, blocks, packets, and prior austenite grains.
  • Understanding this microstructure is key to predicting mechanical properties.
  • Previous models often simplify the intricate hierarchical nature of lath martensite.

Purpose of the Study:

  • To develop a fully parametrized approach for generating realistic martensitic microstructures from prior austenite.
  • To investigate the influence of microstructural features on the mechanical behavior of lath martensite using crystal plasticity simulations.
  • To establish correlations between microstructure and plastic behavior in carbon steels.

Main Methods:

  • Generation of 2D and 3D Representative Volume Elements (RVEs) based on reconstructed austenite microstructures.
  • High-resolution crystal plasticity simulations employing a spectral method solver and phenomenological constitutive models.
  • Systematic investigation of microstructural parameter influences (lath aspect ratio, subblock thickness, grain shape, etc.).

Main Results:

  • High quantitative agreement between simulations using 2D RVEs and experimental 2D microstructures.
  • Significant changes in stress and strain distributions observed when transitioning from 2D to 3D microstructures.
  • Local mechanical behavior is sensitive to microstructural parameters, but the average stress-strain response is largely unaffected.

Conclusions:

  • The developed parametrized approach accurately captures the hierarchical structure of lath martensite.
  • 3D RVEs are essential for accurately simulating stress and strain distributions in lath martensite.
  • Specific microstructural features influence local plasticity, enabling targeted material design.