Wetting phase transition of grain boundaries and material performance of novel Inconel 718

In this work grain boundary (GB) wetting phase transition of Inconel 718 is investigated. 15% GBs are totally wetted when the temperature is raised to 1200 ?C. GB was characterized using Electron Backscattering Diffraction (EBSD). The experimental results revealed that the wetted GB fraction increases to 80% at 1200 ?C and no evidence of transformation beyond this limit. The GBs clearly show that the wetting state and the cooling rate at about 1200 ?C are almost similar to that of quenching. Under ambient condition, it exhibits low ductility which leads to the formation of second phase and increase in hardness and decrease of tensile strength. ? 2021 Elsevier B.V. All rights reserved.

Automated summary

The study found that at 1200°C, the wetted fraction of Inconel 718 grain boundaries reaches 80% with no further transformation. The wetting state at 1200°C is similar to quenching, and it exhibits low ductility under ambient conditions.