Abstract
Abstract In this study, we investigated the precipitation behavior of the R-phase precipitated at the initial stage of aging andits effects on the mechanical properties of 25%Cr-7%Ni-2%Mo-4%W super duplex stainless steel. The R-phase was mainlyprecipitated at the interface of ferrite/austenite phases and inside of the ferrite phase during the initial stage of aging. It wastransformed into the σ-phase with an increase of the aging time. The ferrite phase was decomposed into a newaustenite(γ 2 )phase and the σ-phase by an aging treatment. The R phase was an intermetallic compound showing highermolybdenum and tungsten concentrations than the matrix and also showed higher molybdenum and tungsten concentrations thanthe σ phase. In the initial stage of aging, precipitation of the R-phase did not change the hardness, the strength and theelongation. The hardness and the strength increased upon a longer aging time, but the elongation rapidly decreased. These resultsshow that the R-phase did not significantly affect the hardness and the strength, though it did influence the elongation.Key wordssuper duplex stainless steel, hardness, tensile properties, R-phase, σ phase.
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