X-rays and Corrosion Resistance Analysis of Super Duplex Stain-less Steel UNS 32750
DOI:
https://doi.org/10.5944/ribim.28.2.43143Keywords:
Super Duplex Stainless Steel, X-Ray Analysis,, Corrosion ResistanceAbstract
During heat treatment of distinct types of stainless steel, precipitation of undesirable phases may occur. resulting in reduction of corrosion resistance due to formation of regions depleted of Cr and Mo, as well as significant changes in mechanical properties. Corrosion resistance reduction and embrittlement caused by small volumetric fractions of sigma phase in the microstructure are widely discussed in the literature; however, a great variability in the results is observed. Thus, it becomes essential to study the sigma phase formation, aiming at predicting the microstructural changes after certain thermal history and consequently the corrosion resistance. In this work, the sigma phase formation was analyzed in two independent ways: X-rays of dilatometric trials and corrosion tests. The results show that phase transformations occur predominantly in the temperature range between 800°C and 900°C, where the sigma phase precipitation was observed in the steel UNS 32750.
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