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Open AccessArticle

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

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Materials Science and Engineering Department, Faculty 3mE, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
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Materials Innovation Institute M2i, Elektronicaweg 25, 2628 XG Delft, The Netherlands
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EEMMECS Department, Metals Science and Technology Group, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 903, 9052 Ghent, Belgium
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the 18th International Conference on Textures of Materials (ICOTOM 18), St George, UT, USA, 5–10 November, 2017.
Metals 2020, 10(1), 113; https://doi.org/10.3390/met10010113
Received: 19 October 2019 / Revised: 15 December 2019 / Accepted: 6 January 2020 / Published: 12 January 2020
(This article belongs to the Special Issue High-Strength Low-Alloy Steels)
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. View Full-Text
Keywords: steels; bainite; crystallographic orientations; ductile failure; void initiation. steels; bainite; crystallographic orientations; ductile failure; void initiation.
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MDPI and ACS Style

Shakerifard, B.; Galan Lopez, J.; Kestens, L.A.I. A New Electron Backscatter Diffraction-Based Method to Study the Role of Crystallographic Orientation in Ductile Damage Initiation. Metals 2020, 10, 113.

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