Intermetallic Phase Precipitation in Duplex Stainless Steels during High Temperature Exposition

D.M. Escriba; Edeltraud Materna-Morris; Ronald Lesley Plaut; Angelo Fernando Padilha

doi:10.4028/www.scientific.net/MSF.636-637.478

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Optimization of Ageing Parameters of a Low Nickel Maraging Steel
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Intermetallic Phase Precipitation in Duplex Stainless Steels during High Temperature Exposition
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Intermetallic Phase Precipitation in Duplex Stainless Steels during High Temperature Exposition

Abstract:

The intermetallic phase precipitation, mainly sigma () and chi () phases, was studied in a comparative manner in two stainless duplex steels: a duplex type UNS S31803 and a superduplex type UNS S32520. The -phase precipitated at ferrite/ferrite grain boundaries prior to the -phase precipitation, which occurred preferentially at ferrite/austenite interfaces and at ferrite/ferrite grain boundaries. The -phase precipitation is a eutectoid type reaction of ferrite, leading to -phase and austenite (γ). The -phase precipitated at lower temperatures and in smaller amounts than sigma. The -phase is metastable in the studied steels and was consumed during the -phase precipitation.