Experimental Mechanics

, Volume 53, Issue 3, pp 427–439

Investigation of Strain Heterogeneities Between Grains in Ferritic and Ferritic-Martensitic Steels

Article

DOI: 10.1007/s11340-012-9657-6

Cite this article as:
Marteau, J., Haddadi, H. & Bouvier, S. Exp Mech (2013) 53: 427. doi:10.1007/s11340-012-9657-6
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Abstract

This work uses microlithography, digital image correlation and tensile test in order to investigate the reasons behind the heterogeneous strain distribution at the grain scale. Scanning Electron Microscope images are taken to examine the relationship between microstructure features and strain heterogeneity. The study is carried out on single phase ferritic steel and two dual phase steels with ferrite and different hard particle martensite contents. Useful image correlation is obtained in grains with diameters of 2–3 μm for the martensite and ranging from 10 to 20 μm for the ferrite. To prevent a decrease of image correlation success, some technical aspects as the microgrid step and bar width are extensively tackled with for intermediate deformations (>10 %). The different levels of longitudinal intragranular strains observed inside the ferrite grains are not correlated with their orientation, shape, size or the presence (and content) of hard phase in the material.

Keywords

Full field strain measurements In situ tensile test Dual phase steels Microlithography Strain heterogeneity 

Copyright information

© Society for Experimental Mechanics 2012

Authors and Affiliations

  1. 1.LSPM-CNRS, UPR3407VilletaneuseFrance
  2. 2.Laboratoire RobervalUniversité de Technologie de Compiègne, Centre de Recherches de RoyallieuCompiègne CedexFrance

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