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Effect of W Substitution on the Precipitation Behavior of χ and σ Phase in Super Duplex Stainless Steels
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 Title & Authors
Effect of W Substitution on the Precipitation Behavior of χ and σ Phase in Super Duplex Stainless Steels
Han, Huyn-Sung; Kim, Seong-Hwi; Kang, Chang-Yong;
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This study was carried out to investigate the effect of W substitution on the precipitation behavior of and phases in super duplex stainless steel. The phase was precipitated at the interface of ferrite / austenite phases and inside the ferrite phase at the initial stage of aging. With an increase in the aging time, the volume fraction of the phase increased, and then decreased with the transformation from the phase to the phase. The phase was precipitated later than the phase, and the volume fraction of x phase increased with the increase in the aging time. The ferrite phase was decomposed into the new austenite () and phases by aging treatment. The decomposition of the ferrite phase into the and phases was retarded by W substitution for Mo. The volume fraction of the phase increased and that of the phase decreased due to W substitution. The and phases were intermetallic compounds, which had lower nickel concentration, and higher chromium, molybdenum, and tungsten concentrations. The phase has higher molybdenum and tungsten concentrations than those of the phase. The amounts of chromium and nickel in the and phases did not change, but these phases have higher concentrations of molybdenum and tungsten due to W substitution for Mo.
super duplex stainless steel;W substitution;-phase; phases;aging;
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