Plasticity, localization, and damage in ferritic-pearlitic steel studied by nanoscale digital image correlation

T. Vermeij, J.P.M. Hoefnagels (Corresponding author)

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28 Citations (Scopus)
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Abstract

The evolution of deformation from plasticity to localization to damage is investigated in ferritic-pearlitic steel through nanometer-resolution microstructure-correlated SEM-DIC (µ-DIC) strain mapping, enabled through highly accurate microstructure-to-strain alignment. We reveal the key plasticity mechanisms in ferrite and pearlite as well as their evolution into localization and damage and their relation to the microstructural arrangement. Notably, two contrasting mechanisms were identified that control whether damage initiation in pearlite occurs and, through connection of localization hotspots in ferrite grains, potentially results in macroscale fracture: (i) cracking of pearlite bridges with relatively clean lamellar structure by brittle fracture of cementite lamellae due to build-up of strain concentrations in nearby ferrite, versus (ii) large plasticity without damage in pearlite bridges with a more “open”, chaotic pearlite morphology, which enables plastic percolation paths in the interlamellar ferrite channels. Based on these insights, recommendations for damage resistant ferritic-pearlitic steels are proposed.

Original languageEnglish
Article number114327
Number of pages6
JournalScripta Materialia
Volume208
DOIs
Publication statusPublished - 1 Feb 2022

Bibliographical note

Funding Information:
The authors thank Marc van Maris for experimental support. This research was carried out under project number S17012b in the framework of the Partnership Program of the Materials innovation institute M2i ( www.m2i.nl ) and the Technology Foundation TTW ( www.stw.nl ), which is part of the Netherlands Organization for Scientific Research ( http://www.nwo.nl ).

Keywords

  • Damage
  • Ferritic-pearlitic steel
  • Localization
  • Nanoscale digital image correlation
  • Plasticity

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