6533b860fe1ef96bd12c383e

RESEARCH PRODUCT

Influence of the grain orientation spread on the pitting corrosion resistance of duplex stainless steels using electron backscatter diffraction and critical pitting temperature test at the microscale

Frédéric HerbstDjiby BaS. Le ManchetVincent VignalH. Zhang

subject

AusteniteMaterials scienceDual-phase steelElectron diffractionGeneral Chemical EngineeringMetallurgyPitting corrosionGeneral Materials ScienceGeneral ChemistryAtmospheric temperature rangeMicrostructureCorrosionElectron backscatter diffraction

description

Abstract The corrosion behavior of UNS S32202 duplex stainless steel was studied by combining electron backscatter diffraction (EBSD) measurements and critical pitting temperature tests at the microscale. The grain orientation spread (GOS) value was determined in grains of both phases from EBSD data. It was shown that austenitic sites containing extremely small ferrite grains having a GOS value greater than 1.3° were precursor sites for pitting in 4 M NaCl. The critical pitting temperature range was 45–90 °C. All the other sites of both phases remained passive up to 100 °C.

yearjournalcountryeditionlanguage
2013-03-01Corrosion Science
https://doi.org/10.1016/j.corsci.2012.11.013