Oxygen changes crack modes of Ni-based single crystal superalloy

Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at 650 degrees C under stress. The in-situ oxidation was found to change the tensile fracture mode from the close-packed {111} planes of plastic fracture to {001} planes adjacent to gamma/gamma ' interfaces of brittle fracture. The microanalysis also revealed that the gamma ' cuboids, gamma phase, and gamma/gamma interface exhibit different oxidation behavior, thus underscoring the thickness debit effect. [GRAPHICS] .

Automated summary

This study investigates the oxidation and fracture behaviors of a thin Ni-based single crystal superalloy component at 650 degrees C under stress using an in-situ thermal-stress environmental transmission electron microscope. It was found that in-situ oxidation changed the tensile fracture mode from plastic fracture on {111} planes to brittle fracture on {001} planes adjacent to the gamma/gamma interfaces. Microanalysis also revealed different oxidation behaviors of gamma ' cuboids, gamma phase, and gamma/gamma interface, highlighting the thickness debit effect.