Towards extensive comprehension of Stress Assisted Grain Boundary Oxidation in Ni superalloys - strain localization and crack evolution

Ni superalloys are known for their outstanding performance under harsh environments. They can, however, suffer from stress corrosion cracking (SCC) when their applications involve high temperature, oxidative media, and mechanical loading. Stress Assisted Grain Boundary Oxidation (SAGBO) shares the same degradation patterns in a way to mimic such SCC degradation in time scales that are compatible with laboratory experiments. Therefore we propose an experiment to perform an in-situ analysis of SAGBO using 3D bulk characterization techniques. We intend to have initial grain maps obtained by diffraction contrast tomography, a time-lapse of phase contrast tomography volumes to feed digital image correlation routines and compare to the results of strain fields obtained by far-field X ray diffraction techniques.