Creep fracture behavior of dissimilar weld joints between T92 martensitic and HR3C austenitic steels

Microstructures and mechanical properties of T92/Super304H dissimilar steel weld joints after high-temperature ageing

“…8, the fractographs of the welding seams change with the ageing time, showing that the microstructure evolution of the welding seam also takes place during ageing the T92/Super304H joints. It has been reported the precipitates in the ERNiCrMo-3 weld metal are usually of M 23 C 6 , MX and Laves phases [20]. As for the joints aged for 500 h and less, a dimple aggregation type fracture mechanism of the welding seam is obeyed (Fig.…”

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

“…3c, the martensite laths in the T92 BM are still observable; however, the high temperature tensile process promotes the growth of the M 23 C 6 carbide particles in the T92 BM along the prior austenite grain boundaries and then the segregation of some alloy elements, such as Cr and Ni (main elements of M 23 C 6 ) from the prior austenite grains to the grain boundaries occurs, resulting in the reduction of the solid-solution strengthening effect of the T92 BM. 13 In addition, the continuously distributed M 23 C 6 particles along the austenite grain boundaries separate the austenite grains from each other, which will inevitably decreases the mechanical properties of the T92 BM. It is the reason why the fracture of the T92/Super304H joints preferentially takes place in the T92 BM in the high temperature tensile tests.…”

Heat-Resistant Steels, Microstructure Evolution and Life Assessment in Power Plants

“…Publishes [55,56] discussed the welding technique and process as well as the behaviour of transition joints between austenitic and martensitic/ferritc steels. They found that the location of the failure varied with test parameter.…”