Abstract
Specimens of duplex stainless steels 50:50 ferrite –Austenite were heat treated at 475°C for different times and pulled to failure. Fracture toughness testing was performed according to BS 7448, clip gauge, to monitor specimen displacement. In addition, the direct current potential drop (DCPD) technique was used to monitor the crack propagation. The Crack Tip Open Displacement (CTOD) was evaluated. Computational data, Shear model, were fit to the experimental ones. Discrepancy was observed between the experimental data and the computational ones. The model was able to expect the crack tip open displacement (CTOD), experimental data, only within a certain range of the material hardness. In addition, the direct current potential drop technique was more sensitive to detect the crack propagation process than that observed for the clip gauge. This work aims to study the fracture mechanism during cracking of duplex stainless steels.
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