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The morphology of nitrided iron–chromium alloys; influence of chromium content and nitrogen supersaturation

  • Nicolás Emiliano Vives Díaz , Ralf Erich Schacherl and Eric Jan Mittemeijer
Published/Copyright: March 1, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 2

Abstract

Different iron–chromium alloys (4, 8, 13 and 20 wt.% Cr) were nitrided in NH3/H2 gas mixtures at 580°C. The nitrided microstructure was investigated by X-ray diffraction, light microscopy, hardness measurements and scanning electron microscopy. Composition depth-profiles of the nitrided zone were determined by electron probe microanalysis. Various microstructures develop, depending on the nitriding conditions and the alloy composition (chromium content). The initial development of coherent, sub-microscopical CrN nitrides leads to a state of hydrostatic stress allowing the uptake of excess nitrogen dissolved in the ferrite matrix. It is shown that the outcome of the subsequent discontinuous coarsening process, which leads to a lamellar microstructure, has a close relation to the nitrogen supersaturation. As a result, the occurrence of a distinct gradient in hardness across the nitrided zone can be understood.

Keywords:: Nitriding; Iron alloys; Nitrogen supersaturation; Discontinuous coarsening
1 Correspondence address: Dr. Ralf Erich Schacherl, University of Stuttgart, Institute for Physical Metallurgy, Heisenbergstraße 3, D-70569 Stuttgart, Germany, Tel.: +49 711 689 3314, Fax: +49 711 689 3312. E-mail:

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Received: 2007-05-09
Accepted: 2007-11-19
Published Online: 2013-03-01
Published in Print: 2008-02-01

© 2008, Carl Hanser Verlag, Munich

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  1. Contents
  2. Contents
  3. Editorial
  4. IJMR wishes all its readers and contributors a belated Happy New Year
  5. Basic
  6. Experimental study of the phase relations in the Fe–Zn–Cr system at 600°C
  7. Thermodynamic description of the ternary Pd–Sn–Zn system
  8. The morphology of nitrided iron–chromium alloys; influence of chromium content and nitrogen supersaturation
  9. The surface tension and density of Ag–Bi–Sn alloys
  10. Density and thermal expansion of liquid binary Al–Ag and Al–Cu alloys
  11. Hardening precipitation and mechanical properties in new Mg–Mn–Y–Gd alloys
  12. On recrystallization texture formation in polycrystalline fcc alloys with low stacking fault energies
  13. A numerical study of grain size effects on the strength and elongation of Al polycrystals using strain gradient plasticity theory
  14. Applied
  15. Thermodynamic simulation of the Bayer process
  16. The anisotropy of deformation for friction stir processed Mg alloy due to the existence of onion rings
  17. A study of the Si-phase growth mechanismin thixocast (A356) alloy during hot deformation
  18. Study of hydrogen absorption of aluminum melt
  19. Modelling of work-hardening behaviour for laser welded magnesium alloy
  20. Tribological behavior of short carbon fiber or hybrid with SiCp reinforced Al alloy composites
  21. Elevated temperature compressive behavior of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf alloy with minor Ho addition
  22. Notifications
  23. News
https://doi.org/10.3139/146.101621
Keywords for this article
Nitriding; Iron alloys; Nitrogen supersaturation; Discontinuous coarsening

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. IJMR wishes all its readers and contributors a belated Happy New Year
  5. Basic
  6. Experimental study of the phase relations in the Fe–Zn–Cr system at 600°C
  7. Thermodynamic description of the ternary Pd–Sn–Zn system
  8. The morphology of nitrided iron–chromium alloys; influence of chromium content and nitrogen supersaturation
  9. The surface tension and density of Ag–Bi–Sn alloys
  10. Density and thermal expansion of liquid binary Al–Ag and Al–Cu alloys
  11. Hardening precipitation and mechanical properties in new Mg–Mn–Y–Gd alloys
  12. On recrystallization texture formation in polycrystalline fcc alloys with low stacking fault energies
  13. A numerical study of grain size effects on the strength and elongation of Al polycrystals using strain gradient plasticity theory
  14. Applied
  15. Thermodynamic simulation of the Bayer process
  16. The anisotropy of deformation for friction stir processed Mg alloy due to the existence of onion rings
  17. A study of the Si-phase growth mechanismin thixocast (A356) alloy during hot deformation
  18. Study of hydrogen absorption of aluminum melt
  19. Modelling of work-hardening behaviour for laser welded magnesium alloy
  20. Tribological behavior of short carbon fiber or hybrid with SiCp reinforced Al alloy composites
  21. Elevated temperature compressive behavior of Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf alloy with minor Ho addition
  22. Notifications
  23. News
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