Microstructure and Damage Evolution of Inconel 740H Welded Joint during Creep Process at 750 °C

In this present study, the microstructural and damage characterizations of Inconel 740H alloy welded joint during creep process at 750 °C and 210 MPa were investigated via scanning electron microscopy, electron back-scattered diffraction, and transmission electron microscopy. For the base metal (BM), no significant change for austenite grains occurs with increasing creep time from 1000 to 2651 h. Creep cavities mainly distributed along the grain...