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Effect of isothermal heat treatments on Duplex Stainless Steels impact toughness
Last modified: 2013-06-27
Abstract
Duplex Stainless Steels (DSS) are austenitic-ferritic stainless steels which combine good mechanical
and corrosion-resistance properties and, for this reason, are suitable for structural applications in very aggressive
environments. However, their aging at 600÷1000°C induces the formation of dangerous intermetallic phases,
resulting in serious detrimental effects on both impact toughness and corrosion resistance. Therefore, many
standards related to the manufacturing of DSS, require “no intermetallic phases” in the microstructure.
In the present work, the impact toughness behaviour of two DSSs (SAF 2205 and Zeron®100) has been
investigated after isothermal heat treatments at different time-temperature combinations, in order to study the
influence of different amount of secondary phases on the toughness response.
and corrosion-resistance properties and, for this reason, are suitable for structural applications in very aggressive
environments. However, their aging at 600÷1000°C induces the formation of dangerous intermetallic phases,
resulting in serious detrimental effects on both impact toughness and corrosion resistance. Therefore, many
standards related to the manufacturing of DSS, require “no intermetallic phases” in the microstructure.
In the present work, the impact toughness behaviour of two DSSs (SAF 2205 and Zeron®100) has been
investigated after isothermal heat treatments at different time-temperature combinations, in order to study the
influence of different amount of secondary phases on the toughness response.
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