Nanoscale phase separations in as-fabricated thick super duplex stainless steels

Abstract Nanoscale phase separations, and effects of these, were studied for thick super duplex stainless steel products by atom probe tomography mechanical testing. Although nanoscale separations typically occur during long-time service at intermediate temperatures (300–500° C, our results show that slowly cooled start to develop Fe Cr separation and/or precipitation Cu-rich particles already fabrication. Copper significantly slowed down the kinetics expense particle precipitation, where high-copper material subjected hot isostatic pressing (HIP), with Δ t 500–400 160 s low-copper hot-rolled plate 2 had same level separation. The resulted in lower toughness higher hardness HIP than plate. Therefore, both local cooling rate dependent alloy composition governed variations can be expected as-fabricated condition.