Abstract
This article addresses an investigation of the influence of plastic deformation on low temperature surface hardening by gaseous nitriding of three commercial austenitic stainless steels: AISI 304, EN 1.4369 and Sandvik Nanoflex® with various degrees of austenite stability.
The materials were plastically deformed to different equivalent strains by uniaxial tension. Gaseous nitriding of the strained material was performed in ammonia at atmospheric pressure in the temperature range 693-703 K. Microstructural characterization of the as-deformed states and the nitrided case included X-ray diffraction analysis, reflected light microscopy and microhardness indentation. The results demonstrate that a case of expanded austenite develops and that, in particular, the presence of strain-induced martensite in the initial (deformed) microstructure has a large influence on the nitrided zone.
The materials were plastically deformed to different equivalent strains by uniaxial tension. Gaseous nitriding of the strained material was performed in ammonia at atmospheric pressure in the temperature range 693-703 K. Microstructural characterization of the as-deformed states and the nitrided case included X-ray diffraction analysis, reflected light microscopy and microhardness indentation. The results demonstrate that a case of expanded austenite develops and that, in particular, the presence of strain-induced martensite in the initial (deformed) microstructure has a large influence on the nitrided zone.
| Original language | English |
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| Title of host publication | Heat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference |
| Publisher | ASM International |
| Publication date | 2015 |
| Pages | 612-619 |
| ISBN (Electronic) | 978-1-62708-105-4 |
| Publication status | Published - 2015 |
| Event | 28th ASM Heat Treating Society Conference - Detroit, United States Duration: 20 Oct 2015 → 22 Oct 2015 Conference number: 28 |
Conference
| Conference | 28th ASM Heat Treating Society Conference |
|---|---|
| Number | 28 |
| Country/Territory | United States |
| City | Detroit |
| Period | 20/10/2015 → 22/10/2015 |