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Lecture

WEB Stress and strain partioning in martensite: A systematic crystal plasticity study

Friday (25.09.2020)
12:50 - 13:05 M: Modelling and Simulation 2
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Lath martensite, the non-equilibrium high-strength phase found in carbon steels after a rapid cooling from the austenitic phase-region typically exists in the form of a complex hierarchical compound material. At the smallest, i.e. the "single crystal" scale, individual, elongated domains, the name-giving "laths" form the elemental microstructural building block. Several laths of nearly identical crystallographic orientation group together to "blocks", in which - depending on the exact material characteristics - clearly distinguishable "sub-blocks" might be observed. Several blocks with the same habit plane together form a "packet" of which typically 3 to 4 together finally make up the former parent austenite grain. As already the experimental characterization of this complex structure is challenging and the individual features of the compound material cannot independently be adjusted by chemical composition or heat treatment, comprehensive structure-property relationships for martensite are not established yet. To systematically and independently investigate the effect of individual parameters, crystal plasticity simulations on synthetic martensitic microstructures that follow the experimentally observed hierarchy are a promising route. Here we present a fully parametrized approach to embed hierarchical martensite (sub-)microstructures into existing austenite grain structures to enable systematic studies on microstructural variations. We furthermore perform high-resolution crystal plasticity simulation on several microstructures generated with the presented approach in which we vary selected parameters motivated by experimental observations.

Speaker:
Dr.-Ing. Martin Diehl
Max-Planck-Institut für Eisenforschung GmbH
Additional Authors:
  • Francisco José Gallardo Basile
    Max-Planck-Institut für Eisenforschung GmbH
  • Yannick Naunheim
    Massachusetts Institute of Technology
  • Dr. Franz Roters
    Max-Planck-Institut für Eisenforschung GmbH