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Metallurgical and Materials Transactions A

, Volume 45, Issue 10, pp 4210–4219 | Cite as

Influence of Deformation on the Precipitation Behavior of Nb(CN) in Austenite and Ferrite

  • Matthias Nöhrer
  • Walter Mayer
  • Sophie PrimigEmail author
  • Sabine Zamberger
  • Ernst Kozeschnik
  • Harald Leitner
Article

Abstract

The evolution of Nb precipitates in a low-alloyed steel at 973 K (700 °C) as a function of strain and subsequent dwell time is studied via atom-probe tomography (APT) and transmission electron microscopy. The results show that the volume fraction of the precipitates increases with increasing accumulated deformation because deformation-induced dislocations act as nucleation sites. The chemistry of these precipitates which are Nb carbonitrides changes with the dwell time after the deformation step. With increasing time, the C fraction increases. The precipitation analysis by APT in the austenite and the ferrite reveals that precipitates in the ferrite are larger and exhibit a higher C fraction compared to the precipitates in the austenite after the same thermo-mechanical treatment. The investigations also show that the volume fraction of Nb carbonitrides in the ferrite is higher than in the austenite.

Keywords

Ferrite Austenite Martensite Bainite Dwell Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The financial support by the Austrian Federal Ministry of Economy, Family and Youth and the National Foundation for Research, Technology and Development is gratefully acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Matthias Nöhrer
    • 1
    • 4
  • Walter Mayer
    • 2
  • Sophie Primig
    • 1
    Email author
  • Sabine Zamberger
    • 2
    • 3
  • Ernst Kozeschnik
    • 2
  • Harald Leitner
    • 1
    • 5
  1. 1.Christian Doppler Laboratory for Early Stages of Precipitation, Department of Physical Metallurgy and Materials TestingMontanuniversität LeobenLeobenAustria
  2. 2.Christian Doppler Laboratory for Early Stages of PrecipitationVienna University of TechnologyViennaAustria
  3. 3.voestalpine Stahl Donawitz GmbH & Co KGLeobenAustria
  4. 4.buntmetall amstetten Ges.m.b.HAmstettenAustria
  5. 5.Böhler Edelstahl GmbH & Co KGKapfenbergAustria

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