In-situ observation of stress assisted grain boundary oxidation in Ni718

In-situ observation of SAGBO to understand coalescence kinetics of crack network. A miniature tensile sample will be mounted in the Nanox miniature tensile rig (modified for use in combination with a static furnace) and the 3D grain microstructure in the 2 mm x 0.27 mm x 0.5 mm gauge volume will be characterized by means of X-ray diffraction contrast tomography (DCT) at room temperature. In a next step, the motorized furnace will be lowered over the sample and in-situ observations of SAGBO by means of X-ray phase contrast tomography (PCT) will be performed at 650 C in air and during a non-interrupted tensile load test, carried out at a constant strain rate of 10-5 s-1 until occurrence of the first cracks.