High temperature tensile test and creep rupture strength prediction of T92/Super304H dissimilar steel weld joints

Abstract

After short term tensile test at 823-923 K, microstructure, fractography and fracture mechanism of the T92/Super304H dissimilar steel weld joints were studied. In the high temperature tensile process, the fracture location of all joints is in the T92 base metal; however, the fracture mechanism of these joints changes from a normal mode to a shear mode with the increase of the temperature. Moreover, an equation of the creep rupture strength related to the short term tensile strength of the joints was firstly derived in terms of the Goldenberg model. And then the creep rupture strength of the joints was obtained, s 873 10 5 542?7 MPa.

Microstructural and Performance Analysis of TP304H/T22 Dissimilar Steel Welded Joints

“…Specimen 2 was broken along the fusion line on the TP304H side, and the fracture morphology was also rosy red. Bai conducted high-temperature tensile tests on unserved joints, and the results showed that all joints fractured on the low-alloy side [ 7 ]. In this study, high-temperature tensile tests were performed on welded joints after long-term service, which fractured on the austenite side.…”

“…TP304H and T22 are common dissimilar steel welding combinations in production. In thermal power generating units, many welded structures are manufactured using welded austenitic stainless-steel and low-alloy steel dissimilar metals [ 5 , 6 , 7 ]. Such welded joints operate under different temperatures and pressures for long periods, which necessitates the requirements of high temperature stability, high pressure bearing capacity, and chemical stability.…”