Some metallurgical aspects of Dynamic Strain Aging effect on the Low Cycle Fatigue behavior of C–Mn steels

摘要: Abstract Carbon–Manganese steels and associated welds are commonly used, sometimes to sustain loads in the Low Cycle Fatigue domain. Nevertheless, metallurgy of these C–Mn is rather complex, due interaction solute atoms (carbon nitrogen) with dislocations during deformation which leads metallurgical instabilities: Luders strain, Static Strain Aging (SSA) Dynamic (DSA). The DSA phenomenon an test between submitted supplementary anchorage if temperature sufficient allow diffusion leading a discontinuous plastic localized bands serrations on stress–strain curve. In C–Mn, domain where present from 150 °C 300 °C. If instabilities induce increase hardness, unfortunately they produce decrease ductility detrimental components safety. results effect LCF behavior Alloyed reported literature very confused contradictories. this study, two different sensitivity investigated fatigue As some authors, life seems enhance or reduce maximum, but strain rate always decreases number cycles failure.