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Pacheco, Clara Johanna
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article
Influence of Heat Treatments on Microstructure and Magnetic Domains in Duplex Stainless Steel S31803
Abstract
The influence of heat treatments on microstructure and magnetic domains in duplex stainlesssteel S31803 is studied using an innovative structural characterization protocol. Electronbackscatter diffraction (EBSD) maps as well as magnetic force microscopy (MFM) imagesacquired on the same region of the sample, before and after heat treatment, are compared. Theinfluence of heat treatments on the phase volumetric fractions is studied, and several structuralmodifications after heat treatment are highlighted. Three different mechanisms for thedecomposition of ferrite into sigma phase and secondary austenite are observed duringannealing at 800 °C. MFM analysis reveals that a variety of magnetic domain patterns can existin one ferrite grain