BOUTASSOUNA Djamal University of Laghouat

Spoluautoři LE GALL René, LEFKAIER Ibn Khaldoun

The influence of the annealing temperature on the intergranular fracturing susceptibility of a metallic Nickel based system having composition of 0.8 mass ppm sulfur is investigated. Auger electron spectroscopy (AES) and scanning electron microscopy (SEM) have been the main methods used for inspecting the ability for in-situ intergranular fracturing of the grain boundaries of our material. The samples were first annealed at sufficient temperatures for proper equilibrium time, and then quenched at room temperature. The relationship between sulfur grain boundary segregation and the intergranular fracturing is then considered. We found upon our experiments that at high temperatures that range from 700 to 800 °C, the analysis reveals full ductile fracture of the samples. However, the only sample that presents a partial intergranular fracture is that one annealed at 650°C. The average grain boundary composition for this sample is 15.08 % atomic of sulfur which concords the critical sulfur concentration for the embrittlement of Nickel.