Gaseous nitriding of iron-chromium alloys
-
R. E. Schacherl
,
P. C. J. Graat
Abstract
Fe –Cr alloys containing 4, 7, 13 and 20 wt.% chromium were nitrided in a gas mixture consisting of hydrogen and ammonia at temperatures of 450, 580 and 700 °C. To investigate the nitrided samples light microscopy, scanning electron microscopy, hardness measurements, X-ray diffraction, electron probe microanalysis (EPMA), and Auger electron spectroscopy were applied. The samples with 4 and 7 wt.% Cr which were nitrided at 450 and 580 °C exhibit grains of relatively high hardness, containing finely dispersed submicroscopical chromium nitride precipitates, as well as grains of lower hardness containing discontinuously precipitated chromium nitride. The samples nitrided at 700 °C contain relatively coarse CrN particles. All samples were completely nitrided (i. e., throughout the whole sample cross-section), as confirmed by EPMA: a constant nitrogen content, independent of the occurring precipitation morphology, was observed. This nitrogen content is larger than expected on the basis of the Cr content and the solubility of N in Fe: excess N occurs. Local Cr and N enrichment was observed near pores which had developed mainly along grain boundaries. These pores are especially present in the samples which were nitrided at 700 °C. The evolution of the precipitation morphology, the presence of excess N and the local enrichment of Cr and N near pores were discussed.
We would like to thank Prof. M. A. J. Somers and Dr. P. B. Friehling of the Technical University of Denmark (Lyngby) for provision of nitriding equipment and assistance with the nitriding experiments.
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© 2002 Carl Hanser Verlag, München
Articles in the same Issue
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- Editorial
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- Coupled grain boundary and surface diffusion in a polycrystalline thin film constrained by substrate
- Gallium segregation at grain boundaries in aluminium
- Current work at the Stuttgart UHV diffusion bonding facility
- Bonding between Cu and α-Al2O3
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- SiO2-coated carbon nanotubes: theory and experiment
- Simulation of solidification structures of binary alloys
- Gaseous nitriding of iron-chromium alloys
- Deposition of ceramic materials from aqueous solution induced by organic templates
- Notifications/Mitteilungen
- Personen
- Books
- Information
- DGM Further Training
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Max-Planck-Institut für Metallforschung
- Articles/Aufsätze
- Towards a micromechanical understanding of biological surface devices
- Solid state phase transformation kinetics: a modular transformation model
- Electronic structure investigations of Ni and Cr films on (100)SrTiO3 substrates using electron energy-loss spectroscopy
- Surface magnetization reversal of sputtered CrO2
- Magnetic imaging with full-field soft X-ray microscopy
- Dislocation dynamics in sub-micron confinement: recent progress in Cu thin film plasticity
- Fatigue behavior of polycrystalline thin copper films
- Grain growth in magnetron-sputtered nickel films
- Thin Pd films on SrTiO3 (001) substrates: ab initio local-density-functional theory
- Coupled grain boundary and surface diffusion in a polycrystalline thin film constrained by substrate
- Gallium segregation at grain boundaries in aluminium
- Current work at the Stuttgart UHV diffusion bonding facility
- Bonding between Cu and α-Al2O3
- Compressive deformation of niobium sandwich-bonded to alumina
- SiO2-coated carbon nanotubes: theory and experiment
- Simulation of solidification structures of binary alloys
- Gaseous nitriding of iron-chromium alloys
- Deposition of ceramic materials from aqueous solution induced by organic templates
- Notifications/Mitteilungen
- Personen
- Books
- Information
- DGM Further Training
