Microstructural analysis on creep properties of dissimilar materials joints between T92 martensitic and HR3C austenitic steels

► The creep rupture mechanism of the joint is dependent on stress. ► When stresses ≥140 MPa, the connection of adjacent dimples results in rupture. ► For stresses <140 MPa, M23C6 and Laves phase on grain boundary leads to rupture.