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On the formation of expanded austenite during plasma nitriding of an AISI 316L austenitic stainless steel
| Content Provider | Semantic Scholar |
|---|---|
| Author | Míngolo, Norma Tschiptschin, André P. Pinedo, Carlos Eduardo |
| Copyright Year | 2006 |
| Abstract | Plasma nitriding of an AISI 316L austenitic stainless steel at low (400 °C) and high temperatures (550 °C) was performed under different nitriding gas mixtures. Nitrided surfaces were characterized by XRD using the Rietveld method. Expanded austenite “γN” with a special triclinic (t) crystalline structure was formed during the low-temperature nitriding treatment. Minor volume fractions of Fe3N, Fe4N and Cr2N nitrides were also found. The expanded austenite phase showed a distortion e of the lattice angles due to a very high nitrogen content dissolved in austenite, supersaturating the solid solution and leading to a 10% lattice distortion and to high compressive residual stresses at the surface. After nitriding the specimens at 550 °C the case was composed primarily by a high volume fraction of Fe4N, Cr2N and CrN nitrides, leading to a low distortion of the parent austenitic phase, maintaining the original cubic lattice. |
| Starting Page | 4215 |
| Ending Page | 4218 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.surfcoat.2006.08.060 |
| Volume Number | 201 |
| Alternate Webpage(s) | http://www.pmt.usp.br/academic/antschip/sct2006.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
