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Phase Transformation in Duplex Stainless Steels after Isothermal Treatments, Continuous Cooling and Cold Working

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Abstract:

This paper concerns the phase transformation induced by heat treatment and cold rolling in four duplex stainless steel. In 2205 and 2507 , during the isothermal heat treatments, chi-phase precipitates as small particles at the ferrite/austenite boundaries, followed by sigma precipitation. At the lowest temperature the formation kinetic of chi-phase is favoured, with the increasing of time and temperature a progressive transformation of chi to sigma occurs and the kinetic of sigma is favoured. During continuous cooling, the chi -phase appears at low cooling rates. In low Ni grades the grain boundaries precipitation of chromium nitrides were detected , but no sigma and chi. In 2101 the austenite transforms to martensite both after cold rolling and quenching

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

2986-2991

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.2986

Citation:

Cite this paper

Online since:

January 2010

Authors:

Irene Calliari, Emilio Ramous, Paola Bassani

Keywords:

Duplex, Heat Treatment, Martensite, Phase Transformation

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