A New Electron Backscatter Diffraction-Based Method to Study the Role of Crystallographic Orientation in Ductile Damage Initiation

Behnam Shakerifard, Jesus Galan Lopez, Leo Kestens

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)
    67 Downloads (Pure)

    Abstract

    The third generation of advanced high strength steels shows promising properties for automotive applications. The macroscopic mechanical response of this generation can be further improved by a better understanding of failure mechanisms on the microstructural level and micro-mechanical behavior under various loading conditions. In the current study, the microstructure of a multiphase low silicon bainitic steel is characterized with a scanning electron microscope (SEM) equipped with an electron backscatter diffraction detector. A uniaxial tensile test is carried out on the bainitic steel with martensite and carbides as second phase constituents. An extensive image processing on SEM micrographs is conducted in order to quantify the void evolution during plastic deformation. Later, a new post-mortem electron backscatter diffraction-based method is introduced to address the correlation between crystallographic orientation and damage initiation. In this multiphase steel, particular crystallographic orientation components were observed to be highly susceptible to micro-void formation. It is shown that stress concentration around voids is rather relaxed by void growth than local plasticity. Therefore, this post-mortem method can be used as a validation tool together with a crystal plasticity-based hardening model in order to predict the susceptible crystallographic orientations to damage nucleation.
    Original languageEnglish
    Article number113
    Number of pages11
    JournalMetals
    Volume10
    Issue number1
    DOIs
    Publication statusPublished - 2020

    Keywords

    • steels
    • bainite
    • crystallographic orientations
    • ductile failure
    • void initiation

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