Artículos de revistas
Microcrack growth and fatigue behavior of a duplex stainless steel
Fecha
2009-11Registro en:
Balbi, Marcela Ángela; Avalos, Martina Cecilia; El Bartali, A; Alvarez, Iris; Microcrack growth and fatigue behavior of a duplex stainless steel; Elsevier; International Journal of Fatigue; 31; 11-12; 11-2009; 2006-2013
0142-1123
CONICET Digital
CONICET
Autor
Balbi, Marcela Ángela
Avalos, Martina Cecilia
El Bartali, A
Alvarez, Iris
Resumen
The kinetics of microcrack growth during cycling has been studied in a S32205 duplex stainless steel in the as-received and aged (100 h at 475 °C) conditions. Cylindrical specimens with a shallow notch were subjected to a constant plastic strain range of 0.3% in both thermal conditions. The characteristic features of surface damage and crack growth showed striking differences in microcrack density, nucleation location and propagation rate between the two thermal conditions even though the fatigue lives are comparable. In the as-received material, microcrack density is low and they nucleate mainly at grain and phase boundaries or second-phase particles. In the aged condition, slip markings first appear in the ferritic phase and they are the preferred site for microcrack nucleation. Crack propagation takes place along slip markings in adjacent grains for crack lengths less than 100 μm. A comparison between fatigue life and the relevant parameters of a microcrack growth law was made.