Title: Examining the multi-scale complexity and the crystallographic hierarchy of isothermally treated bainitic and martensitic structures

Journal Article · · Materials Characterization
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  1. National Center for Metallurgical Research (CENIM-CSIC), Madrid (Spain)
  2. National Center for Metallurgical Research (CENIM-CSIC), Madrid (Spain); ArcelorMittal Global R&D, SLab-Steel Labs, Asturias (Spain)
  3. National Center for Metallurgical Research (CENIM-CSIC), Madrid (Spain); IK4 LORTEK, Ordizia (Spain)
  4. Asco Industries Research (CREAS), Hagondange (France)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  6. Univ. Complutense de Madrid (Spain). Spanish National Center for Electron Microscopy (CNME)

In this work, differences and similarities between bainitic and martensitic structures obtained by isothermal heat treatments such as austempering, quench and partitioning (Q&P) and quench and tempering (Q&T), are investigated by multiple techniques including X-ray diffraction, electron backscatter diffraction, scanning and transmission electron microscopy and atom probe tomography. Additionally, results reveal that analogous lath-like ferritic structures with similar austenite content can be achieved by adjusting the isothermal holding temperature. However, certain variability in hardness is recorded, which is consistent with differences on the precipitation state revealed by the nano-scale examination of the structure, and with dissimilar crystallographic size distribution of ferritic grains.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
European Research Fund for Coal and Steel; Spanish Ministry of Science, Economy, and Competitiveness; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1761628
Journal Information:
Materials Characterization, Journal Name: Materials Characterization Journal Issue: N/A Vol. 160; ISSN 1044-5803
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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