MICROCRACKS ANALYSIS IN HIGH-STRENGTH BAINITIC STEEL DURING LOW-CYCLE FATIGUE

MA. C. MARINELLI; MARCELA, BALBI

San Carlos de Bariloche

Congreso; 18º Congreso Internacional de Metalurgia y Materiales; 2018

Comisión Nacional de Energía Atómica

In the present work, the behavior of fatigue microcracks is studied in a high strength bainitic steel. For this reason, it is proposed a gradual monitoring of them during LCF at different plastic strain amplitudes by means of optical and electron microscopy along with EBSD data analysis. From main results, it is highlighted that there are two modes of initiation of microcracks according to the plastic strain applied. At low strain the microcracks preferably initiate along slip systems {110} with high Schmid factor and low Taylor factor, while at high strain they mostly nucleate at high-angle block boundaries