3D mapping of orientation variation and local residual stress within individual grains of pearlitic steel using synchrotron dark field X-ray microscopy

C. Yildirim*, C. Jessop, J. Ahlström, C. Detlefs, Y. Zhang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Assessing the local residual stress and orientation with nanometer resolution within embedded steel grains has remained challenging. Here we use an advanced synchrotron technique, dark field X-ray microscopy to map 3D lattice variations, including both the crystallographic orientation and lattice strain, within two pro-eutectoid ferrite grains in pearlitic steel. We found an orientation variation up to 0.5° and compressive elastic strain up to 1.8 × 10−3 are present in the as-manufactured sample. There is no direct correlation between the measured compressive strain and lattice orientation. The origin of the variations and their influence on the manufacturing process and mechanical properties are discussed.

Original languageEnglish
Article number113783
JournalScripta Materialia
Volume197
Number of pages5
ISSN1359-6462
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
C.Y. thanks Onderzoeks Centrum voor de Aanwending van Staal (OCAS), Belgium, for the financial support of this project. This work has been a part of research activities within the Centre of Excellence CHARMEC (CHAlmers Railway MEChanics, www.charmec.chalmers.se). Parts of the study has been funded within the European Union's Horizon 2020 research and innovation programme in the project In2Track2 under grant agreement No 826255. Y.Z. acknowledges the support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No 788567, M4D). Assoc Prof Fang Liu are acknowledged for careful sample preparation. Finally, the authors acknowledge the ESRF for provision of beamtime on ID06.

Funding Information:
C.Y. thanks Onderzoeks Centrum voor de Aanwending van Staal (OCAS), Belgium, for the financial support of this project. This work has been a part of research activities within the Centre of Excellence CHARMEC (CHAlmers Railway MEChanics, www.charmec.chalmers.se). Parts of the study has been funded within the European Union's Horizon 2020 research and innovation programme in the project In2Track2 under grant agreement No 826255 . Y.Z. acknowledges the support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No 788567 , M4D). Assoc Prof Fang Liu are acknowledged for careful sample preparation. Finally, the authors acknowledge the ESRF for provision of beamtime on ID06.

Keywords

  • Pearlitic steels
  • Residual stresses
  • Synchrotron radiation
  • X-ray diffraction (XRD)

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