Abstract
To clarify the mechanism of plasma nitriding, we examined the optical microstructure, the hardness, the precipitation, and the concentration of dissolved nitrogen in Fe-18Cr-9Ni nitrided using plasma in the range of 723-823 K. Compared with ammonia-gas nitriding, the features of plasma nitriding are the formation of small chromium-nitride precipitates (CrN), the absence of an externally nitrided layer, the high concentration of dissolved nitrogen, and the high hardness (HV=1200). The diffusion coefficient of nitrogen in the present alloy was determined using the growth rate of the internally nitrided layer, based on calculations used in internal oxidation. Plasma- and gas-nitriding were also compared with respect to the growth rate of the nitrided layer.
Original language | English |
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Pages (from-to) | 143-156 |
Number of pages | 14 |
Journal | Oxidation of Metals |
Volume | 36 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - Aug 1 1991 |
Keywords
- CrN precipitates
- Fe-18Cr-9Ni
- kinetics
- nitrogen diffusion
- plasma nitriding
ASJC Scopus subject areas
- Inorganic Chemistry
- Metals and Alloys
- Materials Chemistry