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 |
|---|---|
| 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