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Solubility of nitrogen in ferrite; the Fe–N phase diagram

  • Jendrik Stein , Ralf Erich Schacherl , Minsu Jung , Sairamudu Meka , Bastian Rheingans and Eric Jan Mittemeijer
Published/Copyright: November 5, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 11

Abstract

To accurately define important phase boundaries in the iron–nitrogen (temperature–composition) phase diagram as well as the (temperature–potential) Lehrer diagram, the solubility of nitrogen in ferrite was determined as a function of the nitriding potential (which defines the chemical potential of nitrogen) and the temperature. To this end, thin iron foils were homogeneously nitrided in flowing gas mixtures composed of ammonia and hydrogen. Phase identification was performed by means of X-ray diffraction analysis. Further, from the data obtained, the absorption function and the enthalpy for dissolution of nitrogen into ferrite and the enthalpy of the reaction occurring at the α/(α + γ′)-phase boundary were determined. The data obtained were corrected for the occurrence of a stationary state instead of a local equilibrium at the surface of the specimens. It followed that parts of the phase boundaries in the Lehrer diagram do not represent equilibrium states but rather stationary states.

Keywords: Nitrogen solubility; Lehrer diagram; Fe–N phase diagram; Local equilibrium; Stationary state
* Correspondence address, Dr. Ralf Erich Schacherl, Institute for Materials ScienceUniversity of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany, Tel.: + 49711689-3314, Fax: + 49711689-3312, E-mail:

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Received: 2013-03-25
Accepted: 2013-06-17
Published Online: 2013-11-05
Published in Print: 2013-11-14

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110968
Keywords for this article
Nitrogen solubility; Lehrer diagram; Fe–N phase diagram; Local equilibrium; Stationary state

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Solubility of nitrogen in ferrite; the Fe–N phase diagram
  5. The Li–C phase equilibria
  6. Experimental study of phase equilibria in the “SnO”–SiO2–“FeO” system at silica saturation, and fixed oxygen partial pressures at 1473 K
  7. The evolution of Y distribution during the processing route of mechanically alloyed iron studied by means of atom probe tomography
  8. Oscillative surface morphology in peritectic NiAl using phase-field modeling
  9. Microstructural characterisation of oxide layer developed by sulphuric anodisation on 2017A alloys
  10. Wear and corrosion behaviour of AISI 310 and AISI 316 stainless steels in synthetic mine water
  11. Superplasticity of coarse-grained Ti-13V-11Cr-3Al alloy
  12. Research on the creep fracture mechanism of FGH95 Ni-based superalloy
  13. Hot pressing of Al2O3 matrix ceramic materials improved by diopside additive
  14. Tungsten heavy alloy as a filler metal for repair welding of dies for high pressure die casting
  15. A one-pot synthesis of Ag/α-Fe2O3 nanoplates with gelatin and their photocatalytic activity
  16. Short Communications
  17. Effects of coating solution concentration on the interlaminar shear strength of carbon fiber/epoxy/nano-CaCO3 composites
  18. People
  19. Dr.-Ing. Christa Blank
  20. DGM News
  21. DGM News
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