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This study was carried out to investigate the effects of precipitation of σ phase and N addition and the change of volume fraction on the mechanical properties in 25Cr-7Ni-4Mo-2W super duplex stainless steel. The results obtained from this study are as follows: With increasing the annealing temperature, the volume fraction of austenite increased while volume fraction of ferrite decreased. Volume fraction of austenite was found to be increased by N addition. Tensile strength decreased and elongation increased due to increasing the volume fraction of austenite by increasing annealing temperature. In the case of specimens with N addition, tensile strength and elongation showed high values. a phase was formed at ferrite phase and interface of ferrite and austenite. More precipitation of a phase was stimulated by N addition. With increasing volume fraction of precipitated a phase, tensile strength was increased, while elongation and impact value decreased. In the case of a phase precipitated specimen (with N addition), tensile strength, elongation, hardness and impact values showed higher values than those without N addition. It was also found that impact value rapidly decreases in early stage of aging.

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Effect of Precipitation of &amp;sigma;-Phase and N Addition on the Mechanical Properties in 25Cr&amp;ndash;7Ni&amp;ndash;4Mo&amp;ndash;2W Super Duplex Stainless Steel