A comparative study of mechanical and tribological properties of AISI-304 and AISI-316 submitted to glow discharge nitriding

AUTOR(ES)

Nascimento, Fabiana Cristina, Foerster, Carlos Eugênio, Silva, Silvio Luiz Rutz da, Lepienski, Carlos Mauricio, Siqueira, Carlos José de Mesquita, Alves Junior, Clodomiro

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2009-06

RESUMO

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.

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