Artículos de revistas
Structure and properties of an austenitic stainless steel AISI 316L grade ASTM F138 after low temperature plasma nitriding
Fecha
2010Registro en:
Rem: Revista Escola de Minas, v.63, n.1, p.137-141, 2010
0370-4467
Autor
Tschiptschin, Andre Paulo
Pinedo, Carlos Eduardo
Institución
Resumen
Austenitic stainless steels cannot be conventionally nitrided at temperatures near 550 degrees C due to the intense precipitation of chromium nitrides in the diffusion zone. The precipitation of chro-mium nitrides increases the hardness but severely impairs corrosion resistance. Plasma nitriding allows introducing nitrogen in the steel at temperatures below 450 degrees C, forming pre-dominantly expanded austenite (gamma(N)), with a crystalline structure best represented by a special triclin-ic lattice, with a very high nitrogen atomic concentration promoting high compressive residual stresses at the surface, increasing substrate hardness from 4 GPa up to 14 GPa on the nitrided case.