Effect of solidified grain boundary on interfacial creep failure behavior for steel/nickel dissimilar metal welded joint

Interfacial creep failure was strongly affected by the solidified grain boundary (SGB) for steel/nickel dissimilar metal welded joints, especially at higher temperatures and lower stresses. Short, long, and mixed length SGBs were found as three distinct characteristics adjacent to the interface. These characteristics were attributed to the heterogeneous nucleation, multi-layer thermal cycle, and pre-solidified macrosegregation inducing local...