1. A comparative study of mechanical and tribological properties of AISI-304 and AISI-316 submitted to glow discharge nitriding
- Author
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Fabiana Cristina Nascimento, Carlos Eugênio Foerster, Silvio Luiz Rutz da Silva, Carlos Mauricio Lepienski, Carlos José de Mesquita Siqueira, and Clodomiro Alves Junior
- Subjects
nitriding ,mechanical properties ,austenitic steels ,hardness ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Mechanical and tribological properties os AISI 304 and AISI 316 stainless steels submited to glow discharge ion nitriding are reported.The atmosphere was 20:80 - N2:H2 with substrate temperatures ranging from 300 to 500 °C. Treatment at 300 °C produced expanded austenite (γN) in both steels. Increasing the temperature, the phases γ´-Fe4N and - Fe2+xN were present and the latter is the major phase for AISI 304. At 500 °C, the CrN phase was also identified in both steels. Hardnesses of about 13-14 GPa at near surface regions were obtained in both steels. Moreover, AISI 316 nitrided at 500 °C has the deepest hard layer. Tribological tests showed that wear can be reduced by up to a factor of six after the nitriding processes, even for a working temperature of 300 °C. The profiles during and after nanoscratch tests did not reveal significant differences after nitriding processes in both steels.
- Published
- 2009
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